diff --git a/.github/dependabot.yml b/.github/dependabot.yml
deleted file mode 100644
index 2e546b8..0000000
--- a/.github/dependabot.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-# .github/dependabot.yml
-version: 2
-updates:
-  - package-ecosystem: "npm"
-    directory: "/lib"
-    schedule:
-      interval: "weekly"      # Frecuencia: daily, weekly, monthly
-    open-pull-requests-limit: 5
-    commit-message:
-      prefix: "fix"
-    allow:
-      - dependency-type: "direct"  # Solo las dependencias directas
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cb80f44..0d83562 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,4 +1,5 @@
 name: Build
+
 on:
   push:
     branches: [main]
@@ -6,148 +7,140 @@ on:
     branches: [main]
     paths:
       - 'core/**'
+      - 'lib/**'
       - '.github/workflows/**'
 
 concurrency:
   group: build-${{ github.ref }}
   cancel-in-progress: true
 
-env:
-  OPENJPEG_VERSION: 2.5
-
 jobs:
-  build:
-    name: Build and Package
-    if: ${{ contains(github.event.head_commit.message, 'chore(main):') || github.event_name == 'pull_request' }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-        include:
-          - os: ubuntu-latest
-            binary_name: convert-linux
-          - os: windows-latest
-            binary_name: convert-win.exe
-          - os: macos-latest
-            binary_name: convert-macos
+  build-wasm:
+    name: Build WASM
+    runs-on: ubuntu-latest
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
-      - name: Set up build cache
-        uses: actions/cache@v3
+      - name: Setup Emscripten
+        uses: mymindstorm/setup-emsdk@v14
         with:
-          path: |
-            ~/.vcpkg
-            vcpkg
-            openjpeg/build
-          key: ${{ runner.os }}-build-${{ hashFiles('**/convert.c') }}
-          restore-keys: |
-            ${{ runner.os }}-build-
-
-      - name: Create bin directory
-        run: mkdir -p bin
-        shell: bash
-
-      # Linux setup
-      - name: Install dependencies (Linux)
-        if: runner.os == 'Linux'
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y libopenjp2-7-dev build-essential
-        shell: bash
+          version: 3.1.61
 
-      # Windows setup
-      - name: Install vcpkg (Windows)
-        if: runner.os == 'Windows'
-        run: |
-          if (!(Test-Path vcpkg/.git)) {
-            git clone https://github.com/microsoft/vcpkg.git
-            cd vcpkg
-            .\bootstrap-vcpkg.bat
-            .\vcpkg.exe install openjpeg:x64-windows-static
-          }
-        shell: powershell
-
-      - name: Setup MSVC for Windows
-        if: runner.os == 'Windows'
-        uses: ilammy/msvc-dev-cmd@v1
+      - name: Cache OpenJPEG WASM build
+        uses: actions/cache@v4
+        id: openjpeg-cache
         with:
-          arch: x64
+          path: openjpeg-wasm
+          key: openjpeg-wasm-v2.5.2-${{ hashFiles('core/convert.c') }}
+          restore-keys: openjpeg-wasm-v2.5.2-
 
-      # MacOS setup
-      - name: Install dependencies (macOS)
-        if: runner.os == 'macOS'
-        run: |
-          brew update
-          brew install openjpeg cmake libtiff
-        shell: bash
+      - name: Clone OpenJPEG
+        if: steps.openjpeg-cache.outputs.cache-hit != 'true'
+        run: git clone --depth 1 --branch v2.5.2 https://github.com/uclouvain/openjpeg.git openjpeg-wasm
 
-      - name: Build static OpenJPEG (macOS)
-        if: runner.os == 'macOS'
+      - name: Build OpenJPEG to WASM
+        if: steps.openjpeg-cache.outputs.cache-hit != 'true'
         run: |
-          if [ ! -f "openjpeg/CMakeLists.txt" ]; then
-            rm -rf openjpeg
-            git clone --depth 1 https://github.com/uclouvain/openjpeg.git
-          fi
-
-          cd openjpeg
-          mkdir -p build && cd build
-          cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF -DBUILD_TESTING=OFF -DBUILD_CODEC=OFF -DBUILD_JPIP=OFF
-          make -j$(sysctl -n hw.ncpu)
-          sudo make install
-        shell: bash
-
-      # Build steps for each platform
-      - name: Compile C binary (Linux)
-        if: runner.os == 'Linux'
-        run: |
-          gcc -I/usr/include/openjpeg-${{ env.OPENJPEG_VERSION }} core/convert.c -o bin/${{ matrix.binary_name }} -static -lopenjp2 -lm
-        shell: bash
-      
-      - name: Compile C binary (macOS)
-        if: runner.os == 'macOS'
-        run: |
-          clang core/convert.c -o bin/${{ matrix.binary_name }} -I/usr/local/include/openjpeg-${{ env.OPENJPEG_VERSION }} -L/usr/local/lib /usr/local/lib/libopenjp2.a -lm
-        shell: bash
-
-      - name: Compile C binary (Windows)
-        if: runner.os == 'Windows'
+          mkdir -p openjpeg-wasm/build
+          cd openjpeg-wasm/build
+          emcmake cmake .. \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DBUILD_SHARED_LIBS=OFF \
+            -DBUILD_TESTING=OFF \
+            -DBUILD_CODEC=OFF \
+            -DBUILD_JPIP=OFF
+          make -j$(nproc) openjp2
+
+      - name: Build WASM module
         run: |
-          cl /O2 /I"$env:GITHUB_WORKSPACE\vcpkg\installed\x64-windows-static\include" /Fe:bin\${{ matrix.binary_name }} core\convert.c /link /LIBPATH:"$env:GITHUB_WORKSPACE\vcpkg\installed\x64-windows-static\lib" openjp2.lib
-        shell: powershell
-
-      - name: Test binary
+          OPENJPEG_INCLUDE="openjpeg-wasm/src/lib/openjp2"
+          OPENJPEG_BUILD_INCLUDE="openjpeg-wasm/build/src/lib/openjp2"
+          OPENJPEG_LIB="openjpeg-wasm/build/bin/libopenjp2.a"
+          mkdir -p lib/src/wasm
+          emcc core/convert.c \
+            -I "$OPENJPEG_INCLUDE" \
+            -I "$OPENJPEG_BUILD_INCLUDE" \
+            "$OPENJPEG_LIB" \
+            -O3 \
+            -s MODULARIZE=1 \
+            -s ENVIRONMENT=node \
+            -s ALLOW_MEMORY_GROWTH=1 \
+            -s EXPORTED_FUNCTIONS='["_decode_jp2","_free_buffer","_malloc","_free"]' \
+            -s EXPORTED_RUNTIME_METHODS='["getValue","HEAPU8"]' \
+            -o lib/src/wasm/openjp2.js
+
+      - name: Verify WASM unchanged (drift check)
         run: |
-          ls -la bin/
-          if [ -f "bin/${{ matrix.binary_name }}" ]; then
-            echo "Binary successfully built!"
+          if [ ! -f lib/src/wasm/openjp2.wasm ]; then
+            echo "::warning::No committed WASM found — this is the initial build. Commit lib/src/wasm/ to the repo."
+          elif git diff --quiet lib/src/wasm/; then
+            echo "WASM is up to date."
           else
-            echo "Binary build failed!"
+            echo "::error::Generated WASM differs from committed version. Run core/build-wasm.sh locally and commit the result."
+            git diff --stat lib/src/wasm/
             exit 1
           fi
-        shell: bash
 
-      - name: Upload binaries
+      - name: Upload WASM artifact
         uses: actions/upload-artifact@v4
         with:
-          name: convert-${{ runner.os }}
-          path: bin/${{ matrix.binary_name }}
+          name: wasm-build
+          path: lib/src/wasm/
           if-no-files-found: error
 
+  test:
+    name: Test (${{ matrix.os }}, Node ${{ matrix.node }})
+    runs-on: ${{ matrix.os }}
+    needs: build-wasm
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        node: [18, 20, 22]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Download WASM artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: wasm-build
+          path: lib/src/wasm/
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Enable Corepack and Setup Yarn
+        run: |
+          corepack enable
+          corepack prepare yarn@3.6.1 --activate
+
+      - name: Install dependencies
+        run: cd lib && yarn install --immutable
+
+      - name: Validate
+        run: cd lib && yarn validate
+
+      - name: Test
+        run: cd lib && yarn test
+
   release:
     name: Process Release
     runs-on: ubuntu-latest
-    needs: build
+    needs: [build-wasm, test]
     if: ${{ contains(github.event.head_commit.message, 'chore(main):') }}
+
     steps:
-      - name: Checkout code
+      - name: Checkout repository
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      
+
       - name: Process Release Please
         uses: googleapis/release-please-action@v4
         id: release-please
@@ -155,43 +148,38 @@ jobs:
           config-file: release-please-config.json
           manifest-file: .release-please-manifest.json
           token: ${{ secrets.GITHUB_TOKEN }}
-      
-      - name: Print release outputs for debugging
+
+      - name: Print release outputs
         continue-on-error: true
-        run: |
-          echo "Release outputs:"
-          echo "${{ toJson(steps.release-please.outputs) }}"
-        
-      - name: Download artifacts
+        run: echo "${{ toJson(steps.release-please.outputs) }}"
+
+      - name: Download WASM artifact
         if: ${{ steps.release-please.outputs.releases_created == 'true' }}
         uses: actions/download-artifact@v4
         with:
-          pattern: convert-*
-          path: lib/src/bin/
-          merge-multiple: true
-      
-      - name: Setup Node.js for NPM Publishing
+          name: wasm-build
+          path: lib/src/wasm/
+
+      - name: Setup Node.js
         if: ${{ steps.release-please.outputs.releases_created == 'true' }}
         uses: actions/setup-node@v4
         with:
           node-version: 20
           registry-url: 'https://registry.npmjs.org'
-      
+
       - name: Enable Corepack and Setup Yarn
         if: ${{ steps.release-please.outputs.releases_created == 'true' }}
         run: |
           corepack enable
           corepack prepare yarn@3.6.1 --activate
-          yarn --version
-      
+
       - name: Publish to NPM
         if: ${{ steps.release-please.outputs.releases_created == 'true' }}
         run: |
           cd lib
           yarn install --immutable
           yarn build
-          rm -rf src/bin/
           yarn config set npmAuthToken ${NPM_AUTH_TOKEN}
           yarn npm publish --access public
         env:
-          NPM_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
\ No newline at end of file
+          NPM_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
diff --git a/.github/workflows/security-scan.yml b/.github/workflows/security-scan.yml
deleted file mode 100644
index a027a91..0000000
--- a/.github/workflows/security-scan.yml
+++ /dev/null
@@ -1,73 +0,0 @@
-# .github/workflows/security-scan.yml
-name: Security & Dependency Scanning
-
-on:
-  push:
-    branches: [ main ]
-  pull_request:
-
-permissions:
-  contents: read
-  security-events: write
-
-concurrency:
-  group: security-scan-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  codeql:
-    name: 🔍 CodeQL Analysis
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - name: Initialize CodeQL
-        uses: github/codeql-action/init@v3
-        with:
-          languages: javascript
-      - name: Autobuild
-        uses: github/codeql-action/autobuild@v3
-      - name: Analyze
-        uses: github/codeql-action/analyze@v3
-
-  grype:
-    name: 🧭 Grype Vulnerability Scan
-    runs-on: ubuntu-latest
-    needs: codeql
-    steps:
-      - uses: actions/checkout@v3
-      - name: Enable Corepack and Setup Yarn
-        run: |
-          corepack enable
-          corepack prepare yarn@3.6.1 --activate
-          yarn --version
-      - name: Install dependencies with Yarn
-        run: |
-          cd lib
-          yarn install --immutable
-      - name: Run Grype scan on dependencies
-        id: grype
-        uses: anchore/scan-action@v6
-        with:
-          path: "./lib"
-          output-format: sarif
-          output-file: grype-report.sarif
-          fail-build: true
-          severity-cutoff: critical
-      - name: Upload SARIF report
-        uses: github/codeql-action/upload-sarif@v3
-        with:
-          sarif_file: ./grype-report.sarif
-
-  gitleaks:
-    name: 🔐 Gitleaks Secret Scan
-    runs-on: ubuntu-latest
-    needs: grype
-    steps:
-      - uses: actions/checkout@v3
-      - name: Run Gitleaks
-        uses: zricethezav/gitleaks-action@v2
-        with:
-          config: .github/.gitleaks.toml
-          enable-annotations: true
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.gitignore b/.gitignore
index ede85ec..c191c1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,5 @@ target/
 .classpath
 .settings/
 convert
-output.jpg
\ No newline at end of file
+output.jpg
+node_modules/
\ No newline at end of file
diff --git a/README.md b/README.md
index c331789..a3cce94 100644
--- a/README.md
+++ b/README.md
@@ -1,74 +1,84 @@
 # JPEG2000 Node Wrapper
 
 ## Overview
-**JPEG2000 Node Wrapper** is a simple and efficient solution for converting JP2 images in TypeScript-based systems. It provides a seamless interface between Node.js and a C-based JPEG2000 converter, leveraging the performance and portability of native C code without the need for Java or other heavy runtimes.
 
-This project consists of two main components:
-1. **jp2-to-image** (Node.js Wrapper) - A TypeScript library that exposes a user-friendly API to convert JP2 images.
-2. **core** (C Backend) - A C-based converter that performs the actual JP2 image processing using the OpenJPEG library.
+**JPEG2000 Node Wrapper** is a lightweight solution for converting JP2 images in TypeScript/Node.js projects. It ships as a single WebAssembly module built from the OpenJPEG C library — no system dependencies, no compiler, no ImageMagick required.
 
-This approach ensures compatibility across various environments, including Docker, without requiring additional heavyweight dependencies.
+`npm install jp2-to-image` is all you need. Works identically on Linux (x64/ARM), macOS (Intel/Apple Silicon), Windows, Docker, and Lambda.
 
 ---
 
 ## Features
-✅ Easy-to-use TypeScript API for JP2 image conversion  
-✅ Native performance using C and OpenJPEG  
-✅ No Java or JVM required  
-✅ Lightweight and production-ready for Docker environments  
-✅ Reliable and scalable solution for image processing  
-✅ Fully open-source and free for any use  
+
+- Cross-platform with zero system dependencies (WASM runs everywhere V8 does)
+- No Java, no ImageMagick, no `libopenjp2-7-dev` needed by end users
+- Concurrency-safe (no temp files)
+- Pure JS encoders for PNG and JPEG output
+- Lightweight alternative to `sharp` for JP2-only workloads
 
 ---
 
-## Prerequisites
-Before using JPEG2000 Node Wrapper, ensure you have the following installed:
+## Usage
 
-- **Node.js** (version 16+ recommended)
-- **A C compiler** (e.g., `gcc` or `clang`)  
-- **OpenJPEG development libraries**
+```ts
+import { JPEG2000NodeConverter } from 'jp2-to-image'
 
-To install OpenJPEG on Ubuntu/Debian-based systems:
-```sh
-sudo apt-get update
-sudo apt-get install libopenjp2-7-dev
-```
+const converter = new JPEG2000NodeConverter()
+const jp2Buffer = fs.readFileSync('image.jp2')
 
-To check if the CLI converter is available:
-```sh
-opj_decompress -h
+const png = await converter.convertImage(jp2Buffer, 'png')
+const jpg = await converter.convertImage(jp2Buffer, 'jpg')
 ```
 
-Or if you're compiling your own C binary, make sure the `core/` folder contains the proper build scripts (`Makefile`, etc).
+Supported output formats: `png`, `jpg` / `jpeg`.
+
+---
+
+## Prerequisites (end users)
+
+- **Node.js 18+**
+
+That's it.
 
 ---
 
 ## Development
 
-### Build the C Component
-If you modify the C source code, rebuild the binary:
+### Build the WASM module
+
+The WASM artifacts (`lib/src/wasm/openjp2.js` + `openjp2.wasm`) are pre-built and committed. If you modify `core/convert.c`, rebuild them:
+
 ```sh
-cd core/
-make
+# Install Emscripten SDK first: https://emscripten.org/docs/getting_started/downloads.html
+source /path/to/emsdk/emsdk_env.sh
+./core/build-wasm.sh
 ```
-This will produce the executable used by the Node.js wrapper.
+
+Then commit the updated `lib/src/wasm/` files. CI will verify the committed WASM matches what it builds.
 
 ### Run Tests
+
 ```sh
-cd lib/
+cd lib
+yarn install
 yarn test
 ```
 
 ---
 
-## License  
+## Architecture
 
-This project is **completely free for any use** and is licensed under the **MIT License**. You can find the full license text in the `LICENSE` file in this repository.  
+```
+core/convert.c          C source — decodes JP2 to raw RGB pixels via OpenJPEG
+core/build-wasm.sh      Emscripten build script → generates openjp2.js + openjp2.wasm
+lib/src/wasm/           WASM artifacts (committed, generated by CI/build-wasm.sh)
+lib/src/               TypeScript wrapper — uses pngjs/jpeg-js to encode output
+```
 
-### Dependencies and Third-Party Licenses  
+---
 
-This project wraps the **OpenJPEG** library, which is licensed under the **BSD License**.  
+## License
 
-### Important Notes  
+MIT. See `LICENSE`.
 
-By using OpenJPEG and C, this project remains **lightweight**, **performant**, and **fully MIT-licensed**. 🚀  
+This project uses [OpenJPEG](https://github.com/uclouvain/openjpeg) (BSD-2-Clause), [pngjs](https://github.com/pngjs/pngjs) (MIT), and [jpeg-js](https://github.com/jpeg-js/jpeg-js) (BSD-3-Clause).
diff --git a/core/build-wasm.sh b/core/build-wasm.sh
new file mode 100755
index 0000000..58048d0
--- /dev/null
+++ b/core/build-wasm.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(dirname "$SCRIPT_DIR")"
+OPENJPEG_DIR="$REPO_ROOT/openjpeg-wasm"
+OUT_DIR="$REPO_ROOT/lib/src/wasm"
+
+echo "==> Checking Emscripten..."
+if ! command -v emcc &>/dev/null; then
+  echo "Error: emcc not found. Activate the Emscripten SDK first:"
+  echo "  source /path/to/emsdk/emsdk_env.sh"
+  exit 1
+fi
+emcc --version
+
+# Build OpenJPEG as a static WASM library if not already built
+if [ ! -f "$OPENJPEG_DIR/build/bin/libopenjp2.a" ]; then
+  echo "==> Cloning OpenJPEG v2.5.2..."
+  if [ ! -d "$OPENJPEG_DIR/.git" ]; then
+    git clone --depth 1 --branch v2.5.2 https://github.com/uclouvain/openjpeg.git "$OPENJPEG_DIR"
+  fi
+
+  echo "==> Building OpenJPEG to WASM..."
+  mkdir -p "$OPENJPEG_DIR/build"
+  cd "$OPENJPEG_DIR/build"
+  emcmake cmake .. \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DBUILD_SHARED_LIBS=OFF \
+    -DBUILD_TESTING=OFF \
+    -DBUILD_CODEC=OFF \
+    -DBUILD_JPIP=OFF
+  make -j"$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)" openjp2
+  cd "$REPO_ROOT"
+else
+  echo "==> OpenJPEG WASM build found, skipping."
+fi
+
+OPENJPEG_INCLUDE="$OPENJPEG_DIR/src/lib/openjp2"
+OPENJPEG_BUILD_INCLUDE="$OPENJPEG_DIR/build/src/lib/openjp2"
+OPENJPEG_LIB="$OPENJPEG_DIR/build/bin/libopenjp2.a"
+
+mkdir -p "$OUT_DIR"
+
+echo "==> Compiling convert.c to WASM..."
+emcc "$SCRIPT_DIR/convert.c" \
+  -I "$OPENJPEG_INCLUDE" \
+  -I "$OPENJPEG_BUILD_INCLUDE" \
+  "$OPENJPEG_LIB" \
+  -O3 \
+  -s MODULARIZE=1 \
+  -s ENVIRONMENT=node \
+  -s ALLOW_MEMORY_GROWTH=1 \
+  -s EXPORTED_FUNCTIONS='["_decode_jp2","_free_buffer","_malloc","_free"]' \
+  -s EXPORTED_RUNTIME_METHODS='["getValue","HEAPU8"]' \
+  -o "$OUT_DIR/openjp2.js"
+
+echo "==> Done. Generated:"
+ls -lh "$OUT_DIR"/openjp2.*
diff --git a/core/convert.c b/core/convert.c
index 929bb3b..6010b27 100644
--- a/core/convert.c
+++ b/core/convert.c
@@ -2,213 +2,144 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-
-#define STB_IMAGE_WRITE_IMPLEMENTATION
-#include "stb_image_write.h"
-
-#define TEMP_INPUT "temp_input.jp2"
-#define TEMP_OUTPUT "temp_output.bin"
-
-// --- Callbacks ---
-void error_callback(const char *msg, void *client_data) { (void)client_data; fprintf(stderr, "[ERROR] %s\n", msg); }
-void warning_callback(const char *msg, void *client_data) { (void)client_data; fprintf(stderr, "[WARNING] %s\n", msg); }
-void info_callback(const char *msg, void *client_data) { (void)client_data; fprintf(stderr, "[INFO] %s\n", msg); }
-
-static void write_to_file(void *context, void *data, int size) {
-    FILE *file = (FILE*)context;
-    fwrite(data, 1, size, file);
-    fflush(file);
+#include <stdint.h>
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#define EXPORT EMSCRIPTEN_KEEPALIVE
+#else
+#define EXPORT
+#endif
+
+// --- OpenJPEG callbacks ---
+static void error_callback(const char *msg, void *client_data) { (void)client_data; fprintf(stderr, "[ERROR] %s\n", msg); }
+static void warning_callback(const char *msg, void *client_data) { (void)client_data; fprintf(stderr, "[WARNING] %s\n", msg); }
+
+// --- In-memory stream ---
+typedef struct {
+    const uint8_t *data;
+    size_t length;
+    size_t position;
+} mem_stream_t;
+
+static OPJ_SIZE_T mem_stream_read(void *buf, OPJ_SIZE_T nb, void *udata) {
+    mem_stream_t *ms = (mem_stream_t *)udata;
+    size_t remaining = ms->length - ms->position;
+    if (remaining == 0) return (OPJ_SIZE_T)-1;
+    OPJ_SIZE_T to_read = (nb < remaining) ? nb : (OPJ_SIZE_T)remaining;
+    memcpy(buf, ms->data + ms->position, to_read);
+    ms->position += to_read;
+    return to_read;
 }
 
-int write_temp_input() {
-    FILE* f = fopen(TEMP_INPUT, "wb");
-    if (!f) return -1;
-
-    unsigned char buf[8192];
-    size_t total = 0, read;
-    while ((read = fread(buf, 1, sizeof(buf), stdin)) > 0) {
-        fwrite(buf, 1, read, f);
-        total += read;
-    }
-
-    fclose(f);
-    if (total == 0) return -2;
-
-    fprintf(stderr, "Read %zu bytes from stdin\n", total);
-    return 0;
+static OPJ_OFF_T mem_stream_skip(OPJ_OFF_T nb, void *udata) {
+    mem_stream_t *ms = (mem_stream_t *)udata;
+    size_t remaining = ms->length - ms->position;
+    if ((size_t)nb > remaining) nb = (OPJ_OFF_T)remaining;
+    ms->position += (size_t)nb;
+    return nb;
 }
 
-int is_format_supported(const char* fmt) {
-    return strcmp(fmt, "png") == 0 || strcmp(fmt, "bmp") == 0 || strcmp(fmt, "jpg") == 0 || strcmp(fmt, "jpeg") == 0;
+static OPJ_BOOL mem_stream_seek(OPJ_OFF_T nb, void *udata) {
+    mem_stream_t *ms = (mem_stream_t *)udata;
+    if ((size_t)nb > ms->length) return OPJ_FALSE;
+    ms->position = (size_t)nb;
+    return OPJ_TRUE;
 }
 
-void cleanup_all(opj_image_t* img, opj_codec_t* codec, const char* reason) {
-    if (reason) fprintf(stderr, "Error: %s\n", reason);
-    if (img) opj_image_destroy(img);
-    if (codec) opj_destroy_codec(codec);
-    remove(TEMP_INPUT);
-    remove(TEMP_OUTPUT);
-}
+// --- Public API ---
 
-int run_test() {
-    fprintf(stderr, "Running test...\n");
-    int result = system("cat test.jp2 | ./convert jpg > output.jpg");
-
-    if (result != 0) {
-        fprintf(stderr, "Test failed with code %d\n", result);
-        return 1;
-    }
-
-    FILE* f = fopen("output.jpg", "rb");
-    if (!f) {
-        fprintf(stderr, "Test failed: output.jpg not created\n");
-        return 1;
-    }
-
-    fseek(f, 0, SEEK_END);
-    long size = ftell(f);
-    fclose(f);
-
-    if (size <= 0) {
-        fprintf(stderr, "Test failed: output.jpg is empty\n");
-        return 1;
-    }
-
-    fprintf(stderr, "Test passed: output.jpg created (%ld bytes)\n", size);
-    return 0;
-}
-
-int main(int argc, char *argv[]) {
-    // Run test mode
-    if (argc > 1 && strcmp(argv[1], "--test") == 0) {
-        return run_test();
-    }
-    
-    const char* format = (argc > 1) ? argv[1] : "png";
-    if (!is_format_supported(format)) {
-        fprintf(stderr, "Unsupported format: %s\nSupported: png, bmp, jpg, jpeg\n", format);
-        return 1;
-    }
+/*
+ * Decodes a JP2 image from memory.
+ * Returns a malloc'd RGB(A) pixel buffer. Caller must free via free_buffer().
+ * On error returns NULL. out_width/out_height/out_channels are set on success.
+ */
+EXPORT uint8_t *decode_jp2(const uint8_t *input, int input_len,
+                            int *out_width, int *out_height, int *out_channels) {
+    if (!input || input_len <= 0) return NULL;
 
-    int input_status = write_temp_input();
-    if (input_status != 0) {
-        fprintf(stderr, input_status == -1 ? "Could not create temp input\n" : "No data from stdin\n");
-        return 1;
-    }
+    mem_stream_t ms = { input, (size_t)input_len, 0 };
 
-    opj_codec_t* codec = opj_create_decompress(OPJ_CODEC_JP2);
-    if (!codec) {
-        remove(TEMP_INPUT);
-        fprintf(stderr, "Could not create decoder\n");
-        return 1;
-    }
+    opj_codec_t *codec = opj_create_decompress(OPJ_CODEC_JP2);
+    if (!codec) return NULL;
 
     opj_set_error_handler(codec, error_callback, NULL);
     opj_set_warning_handler(codec, warning_callback, NULL);
-    
-    #ifdef DEBUG
-    opj_set_info_handler(codec, info_callback, NULL);
-    #endif
 
     opj_dparameters_t params;
     opj_set_default_decoder_parameters(&params);
-
     if (!opj_setup_decoder(codec, &params)) {
-        cleanup_all(NULL, codec, "setup decoder failed");
-        return 1;
+        opj_destroy_codec(codec);
+        return NULL;
     }
 
-    opj_stream_t* stream = opj_stream_create_default_file_stream(TEMP_INPUT, OPJ_TRUE);
+    opj_stream_t *stream = opj_stream_create((OPJ_SIZE_T)input_len, OPJ_TRUE);
     if (!stream) {
-        cleanup_all(NULL, codec, "stream creation failed");
-        return 1;
+        opj_destroy_codec(codec);
+        return NULL;
     }
 
-    opj_image_t* image = NULL;
-    if (!opj_read_header(stream, codec, &image) || !opj_decode(codec, stream, image) || !opj_end_decompress(codec, stream)) {
-        opj_stream_destroy(stream);
-        cleanup_all(image, codec, "decoding failed");
-        return 1;
-    }
+    opj_stream_set_user_data(stream, &ms, NULL);
+    opj_stream_set_user_data_length(stream, (OPJ_UINT64)input_len);
+    opj_stream_set_read_function(stream, mem_stream_read);
+    opj_stream_set_skip_function(stream, mem_stream_skip);
+    opj_stream_set_seek_function(stream, mem_stream_seek);
+
+    opj_image_t *image = NULL;
+    int ok = opj_read_header(stream, codec, &image)
+          && opj_decode(codec, stream, image)
+          && opj_end_decompress(codec, stream);
 
     opj_stream_destroy(stream);
+    opj_destroy_codec(codec);
+
+    if (!ok) {
+        if (image) opj_image_destroy(image);
+        return NULL;
+    }
 
     if (image->numcomps < 3) {
-        cleanup_all(image, codec, "less than 3 components (RGB required)");
-        return 1;
+        opj_image_destroy(image);
+        return NULL;
     }
 
-    int width = image->comps[0].w, height = image->comps[0].h;
-    for (int i = 1; i < 3; ++i)
-        if (image->comps[i].w != width || image->comps[i].h != height) {
-            cleanup_all(image, codec, "component size mismatch");
-            return 1;
+    int width    = (int)image->comps[0].w;
+    int height   = (int)image->comps[0].h;
+    int channels = (image->numcomps >= 4) ? 4 : 3;
+
+    for (int i = 1; i < channels; i++) {
+        if ((int)image->comps[i].w != width || (int)image->comps[i].h != height) {
+            opj_image_destroy(image);
+            return NULL;
         }
+    }
 
-    unsigned char* rgb = malloc(width * height * 3);
-    if (!rgb) {
-        cleanup_all(image, codec, "memory allocation failed");
-        return 1;
+    uint8_t *pixels = (uint8_t *)malloc((size_t)(width * height * channels));
+    if (!pixels) {
+        opj_image_destroy(image);
+        return NULL;
     }
 
     int max_val = (1 << image->comps[0].prec) - 1;
-    for (int i = 0; i < width * height; ++i) {
-        for (int c = 0; c < 3; ++c) {
+    for (int i = 0; i < width * height; i++) {
+        for (int c = 0; c < channels; c++) {
             int val = image->comps[c].data[i];
-            if (image->comps[c].sgnd) val += max_val / 2;
+            if (image->comps[c].sgnd) val += (max_val + 1) / 2;
             val = (val * 255) / max_val;
-            rgb[i * 3 + c] = (unsigned char)(val < 0 ? 0 : val > 255 ? 255 : val);
+            if (val < 0) val = 0;
+            if (val > 255) val = 255;
+            pixels[i * channels + c] = (uint8_t)val;
         }
     }
 
-    FILE* fout = fopen(TEMP_OUTPUT, "wb");
-    if (!fout) {
-        free(rgb);
-        cleanup_all(image, codec, "could not create temp file output");
-        return 1;
-    }
-
-    int success = 0;
-    if (strcmp(format, "png") == 0)
-        success = stbi_write_png_to_func(write_to_file, fout, width, height, 3, rgb, width * 3);
-    else if (strcmp(format, "bmp") == 0)
-        success = stbi_write_bmp_to_func(write_to_file, fout, width, height, 3, rgb);
-    else
-        success = stbi_write_jpg_to_func(write_to_file, fout, width, height, 3, rgb, 90);
-
-    fclose(fout);
-    free(rgb);
     opj_image_destroy(image);
-    opj_destroy_codec(codec);
-
-    if (!success) {
-        remove(TEMP_INPUT); remove(TEMP_OUTPUT);
-        fprintf(stderr, "image write failed\n");
-        return 1;
-    }
 
-    FILE* out = fopen(TEMP_OUTPUT, "rb");
-    if (!out) {
-        remove(TEMP_INPUT); remove(TEMP_OUTPUT);
-        fprintf(stderr, "could not open output file\n");
-        return 1;
-    }
-
-    unsigned char buf[8192];
-    size_t r;
-    while ((r = fread(buf, 1, sizeof(buf), out)) > 0) {
-        if (fwrite(buf, 1, r, stdout) != r) {
-            fclose(out);
-            remove(TEMP_INPUT); remove(TEMP_OUTPUT);
-            fprintf(stderr, "stdout write failed\n");
-            return 1;
-        }
-    }
-    fclose(out);
-    fflush(stdout);
+    *out_width    = width;
+    *out_height   = height;
+    *out_channels = channels;
+    return pixels;
+}
 
-    remove(TEMP_INPUT);
-    remove(TEMP_OUTPUT);
-    fprintf(stderr, "Conversion to %s complete\n", format);
-    return 0;
+EXPORT void free_buffer(uint8_t *ptr) {
+    free(ptr);
 }
diff --git a/lib/eslint.config.js b/lib/eslint.config.js
new file mode 100644
index 0000000..1325cb3
--- /dev/null
+++ b/lib/eslint.config.js
@@ -0,0 +1,55 @@
+const tsPlugin = require('@typescript-eslint/eslint-plugin')
+const tsParser = require('@typescript-eslint/parser')
+const importPlugin = require('eslint-plugin-import')
+const prettierPlugin = require('eslint-plugin-prettier')
+const eslintConfigPrettier = require('eslint-config-prettier')
+
+module.exports = [
+  {
+    ignores: ['build/**', 'node_modules/**', 'eslint.config.js'],
+  },
+  {
+    files: ['src/**/*.ts', 'tests/**/*.ts'],
+    plugins: {
+      '@typescript-eslint': tsPlugin,
+      import: importPlugin,
+      prettier: prettierPlugin,
+    },
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        project: 'tsconfig.eslint.json',
+        tsconfigRootDir: __dirname,
+        sourceType: 'module',
+      },
+    },
+    settings: {
+      'import/resolver': {
+        typescript: {
+          project: 'tsconfig.eslint.json',
+        },
+      },
+    },
+    rules: {
+      ...tsPlugin.configs.recommended.rules,
+      ...eslintConfigPrettier.rules,
+      'prettier/prettier': 'error',
+      'arrow-body-style': 'off',
+      'prefer-arrow-callback': 'off',
+      '@typescript-eslint/interface-name-prefix': 'off',
+      '@typescript-eslint/explicit-function-return-type': 'off',
+      '@typescript-eslint/explicit-module-boundary-types': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      'import/no-cycle': 'error',
+      'import/newline-after-import': ['error', { count: 1 }],
+      'import/order': [
+        'error',
+        {
+          groups: ['type', ['builtin', 'external'], 'parent', 'sibling', 'index'],
+          alphabetize: { order: 'asc' },
+          'newlines-between': 'always',
+        },
+      ],
+    },
+  },
+]
diff --git a/lib/package.json b/lib/package.json
index 1c21e36..633c17f 100644
--- a/lib/package.json
+++ b/lib/package.json
@@ -21,7 +21,7 @@
     "prettier": "prettier '**/*.+(js|json|ts|tsx|md|yml|yaml)'",
     "format": "yarn prettier --write",
     "check-format": "yarn prettier --list-different",
-    "build": "yarn run clean && yarn run compile && cpx 'src/bin/**/*' build/bin",
+    "build": "yarn run clean && yarn run compile && cpx 'src/wasm/**/*' build/wasm",
     "clean": "rimraf -rf ./build",
     "compile": "tsc -p tsconfig.json",
     "prepublishOnly": "yarn run build",
@@ -36,17 +36,16 @@
     "jp2"
   ],
   "files": [
-    "build",
-    "bin"
+    "build"
   ],
   "publishConfig": {
     "access": "public"
   },
   "devDependencies": {
-    "@types/fs-extra": "^11.0.4",
     "@types/jest": "^29.5.14",
     "@types/node": "^24.0.4",
-    "@typescript-eslint/eslint-plugin": "^6.0.0",
+    "@types/pngjs": "^6.0.5",
+    "@typescript-eslint/eslint-plugin": "^8.35.0",
     "@typescript-eslint/parser": "^8.35.0",
     "cpx": "^1.5.0",
     "eslint": "^9.30.0",
@@ -67,6 +66,7 @@
   },
   "packageManager": "yarn@3.6.1",
   "dependencies": {
-    "fs-extra": "^11.3.0"
+    "jpeg-js": "^0.4.4",
+    "pngjs": "^7.0.0"
   }
 }
diff --git a/lib/src/JPEG2000NodeConverter.ts b/lib/src/JPEG2000NodeConverter.ts
index afc9996..7532493 100644
--- a/lib/src/JPEG2000NodeConverter.ts
+++ b/lib/src/JPEG2000NodeConverter.ts
@@ -1,74 +1,86 @@
-import { spawn } from 'child_process'
-import * as fs from 'fs-extra'
-import * as path from 'path'
+import type { OpenjpegModule } from './wasm/openjp2'
+
+import * as jpeg from 'jpeg-js'
+import { PNG } from 'pngjs'
 
 export class JPEG2000NodeConverter {
-  private binPath: string
+  private static modulePromise: Promise<OpenjpegModule> | null = null
+
+  private static getModule(): Promise<OpenjpegModule> {
+    if (!JPEG2000NodeConverter.modulePromise) {
+      // eslint-disable-next-line @typescript-eslint/no-require-imports
+      const createModule = require('./wasm/openjp2') as (
+        options?: Record<string, unknown>,
+      ) => Promise<OpenjpegModule>
+      JPEG2000NodeConverter.modulePromise = createModule()
+    }
+    return JPEG2000NodeConverter.modulePromise
+  }
+
+  async convertImage(inputBuffer: Buffer, format: string = 'png'): Promise<Buffer> {
+    const mod = await JPEG2000NodeConverter.getModule()
+    return this._convert(mod, inputBuffer, format)
+  }
+
+  private _convert(mod: OpenjpegModule, inputBuffer: Buffer, format: string): Buffer {
+    const inputPtr = mod._malloc(inputBuffer.length)
+    if (!inputPtr) throw new Error('WASM memory allocation failed for input')
+
+    const widthPtr = mod._malloc(4)
+    const heightPtr = mod._malloc(4)
+    const channelsPtr = mod._malloc(4)
 
-  constructor() {
-    const platform = process.platform
-    let binFileName = 'convert' // base path
+    try {
+      mod.HEAPU8.set(inputBuffer, inputPtr)
+
+      const pixelsPtr = mod._decode_jp2(inputPtr, inputBuffer.length, widthPtr, heightPtr, channelsPtr)
+      if (!pixelsPtr) throw new Error('JP2 decoding failed: invalid or unsupported image')
 
-    if (platform === 'win32') binFileName = 'convert-win.exe'
-    else if (platform === 'darwin') binFileName = 'convert-mac'
-    else if (platform === 'linux') binFileName = 'convert-linux'
-    else throw new Error(`Unsupported platform: ${platform}`)
+      const width = mod.getValue(widthPtr, 'i32')
+      const height = mod.getValue(heightPtr, 'i32')
+      const channels = mod.getValue(channelsPtr, 'i32')
 
-    this.binPath = path.resolve(__dirname, 'bin', binFileName)
+      const pixelCount = width * height * channels
+      const pixels = Buffer.from(mod.HEAPU8.buffer, pixelsPtr, pixelCount)
+      // Copy before freeing WASM memory
+      const pixelsCopy = Buffer.from(pixels)
+      mod._free_buffer(pixelsPtr)
 
-    if (platform !== 'win32') {
-      fs.ensureFileSync(this.binPath)
-      fs.chmodSync(this.binPath, 0o755)
+      return this._encode(pixelsCopy, width, height, channels, format)
+    } finally {
+      mod._free(inputPtr)
+      mod._free(widthPtr)
+      mod._free(heightPtr)
+      mod._free(channelsPtr)
     }
   }
 
-  /**
-   * Handles the conversion process
-   * @param inputBuffer The input image buffer
-   * @param format Target format
-   * @returns Converted image as a buffer
-   */
-  async convertImage(inputBuffer: Buffer, format: string = 'png'): Promise<Buffer> {
-    try {
-      const convertedBuffer = await this._executeJar(inputBuffer, format)
-      return convertedBuffer
-    } catch (error) {
-      console.error(`Error converting to ${format}:`, error)
-      throw error
+  private _encode(pixels: Buffer, width: number, height: number, channels: number, format: string): Buffer {
+    const fmt = format.toLowerCase()
+    const rgba = channels === 4 ? pixels : this._rgbToRgba(pixels, width, height)
+
+    if (fmt === 'png') {
+      const png = new PNG({ width, height })
+      png.data = rgba
+      return PNG.sync.write(png)
     }
+
+    if (fmt === 'jpg' || fmt === 'jpeg') {
+      const result = jpeg.encode({ data: rgba, width, height }, 90)
+      return result.data as Buffer
+    }
+
+    throw new Error(`Unsupported format: "${format}". Supported formats: png, jpg, jpeg`)
   }
 
-  /**
-   * Executes the conversion binary, sending the image via stdin and receiving the result via stdout.
-   *
-   * @param inputBuffer The input image as a Buffer
-   * @param format The desired output format (e.g., "jpg", "png", "jp2")
-   * @returns The converted image as a Buffer
-   */
-  private _executeJar(inputBuffer: Buffer, format: string): Promise<Buffer> {
-    return new Promise((resolve, reject) => {
-      const process = spawn(this.binPath, [format])
-
-      const outputBuffer: Buffer[] = []
-      let errorOutput = ''
-
-      // Capture stdout as Buffer
-      process.stdout.on('data', data => outputBuffer.push(data))
-
-      // Capture stderr
-      process.stderr.on('data', data => (errorOutput += data.toString()))
-
-      process.on('close', code => {
-        if (code !== 0) {
-          reject(new Error(`Process failed with code ${code}: ${errorOutput}`))
-        } else {
-          resolve(Buffer.concat(outputBuffer)) // Combine all received chunks
-        }
-      })
-
-      // Write image buffer to process and close stdin
-      process.stdin.write(inputBuffer)
-      process.stdin.end()
-    })
+  private _rgbToRgba(rgb: Buffer, width: number, height: number): Buffer {
+    const rgba = Buffer.alloc(width * height * 4)
+    for (let i = 0; i < width * height; i++) {
+      rgba[i * 4] = rgb[i * 3]
+      rgba[i * 4 + 1] = rgb[i * 3 + 1]
+      rgba[i * 4 + 2] = rgb[i * 3 + 2]
+      rgba[i * 4 + 3] = 255
+    }
+    return rgba
   }
 }
diff --git a/lib/src/wasm/openjp2.d.ts b/lib/src/wasm/openjp2.d.ts
new file mode 100644
index 0000000..26266d7
--- /dev/null
+++ b/lib/src/wasm/openjp2.d.ts
@@ -0,0 +1,21 @@
+// Type declarations for the Emscripten-generated WASM module (CommonJS format).
+// The actual openjp2.js + openjp2.wasm are generated by core/build-wasm.sh.
+
+export interface OpenjpegModule {
+  _decode_jp2(
+    inputPtr: number,
+    inputLen: number,
+    widthPtr: number,
+    heightPtr: number,
+    channelsPtr: number,
+  ): number
+  _free_buffer(ptr: number): void
+  _malloc(size: number): number
+  _free(ptr: number): void
+  HEAPU8: Uint8Array
+  getValue(ptr: number, type: string): number
+}
+
+declare function createOpenjpegModule(options?: Record<string, unknown>): Promise<OpenjpegModule>
+
+export = createOpenjpegModule
diff --git a/lib/tests/JPEG2000NodeConverter.test.ts b/lib/tests/JPEG2000NodeConverter.test.ts
index fe6644f..2d47d01 100644
--- a/lib/tests/JPEG2000NodeConverter.test.ts
+++ b/lib/tests/JPEG2000NodeConverter.test.ts
@@ -3,20 +3,54 @@ import * as path from 'path'
 
 import { JPEG2000NodeConverter } from '../src'
 
+const FIXTURE = path.join(__dirname, '..', 'assets', 'test.jp2')
+
 describe('JPEG2000NodeConverter', () => {
-  const inputFilePath = path.join(__dirname, '..', 'assets', 'test.jp2')
+  let inputBuffer: Buffer
 
-  it('should convert test.jp2 to jpg', async () => {
-    const inputBuffer = fs.readFileSync(inputFilePath)
+  beforeAll(() => {
+    inputBuffer = fs.readFileSync(FIXTURE)
+  })
 
+  it('converts test.jp2 to jpg', async () => {
     const start = Date.now()
-    const outputBuffer = await new JPEG2000NodeConverter().convertImage(inputBuffer, 'jpg')
-    const duration = Date.now() - start
+    const output = await new JPEG2000NodeConverter().convertImage(inputBuffer, 'jpg')
+    console.log(`JP2 → JPG took ${Date.now() - start}ms`)
+
+    expect(output.length).toBeGreaterThan(0)
+    expect(output.toString('base64')).toMatch(/^([A-Za-z0-9+/=]+)$/)
+    // JPEG magic bytes: FF D8 FF
+    expect(output[0]).toBe(0xff)
+    expect(output[1]).toBe(0xd8)
+    expect(output[2]).toBe(0xff)
+  })
+
+  it('converts test.jp2 to png', async () => {
+    const output = await new JPEG2000NodeConverter().convertImage(inputBuffer, 'png')
+
+    expect(output.length).toBeGreaterThan(0)
+    // PNG magic bytes: 89 50 4E 47
+    expect(output[0]).toBe(0x89)
+    expect(output[1]).toBe(0x50)
+    expect(output[2]).toBe(0x4e)
+    expect(output[3]).toBe(0x47)
+  })
+
+  it('handles concurrent conversions correctly', async () => {
+    const results = await Promise.all(
+      Array.from({ length: 10 }, () => new JPEG2000NodeConverter().convertImage(inputBuffer, 'png')),
+    )
 
-    console.log(`Conversion took ${duration}ms`)
+    // All results must be identical (regression for temp-file concurrency bug)
+    const reference = results[0].toString('base64')
+    for (const result of results) {
+      expect(result.toString('base64')).toBe(reference)
+    }
+  })
 
-    const outputBase64 = outputBuffer.toString('base64')
-    expect(outputBase64).toMatch(/^([A-Za-z0-9+/=]+)$/)
-    expect(outputBase64.length).toBeGreaterThan(0)
-  }, 15000)
+  it('throws on unsupported format', async () => {
+    await expect(new JPEG2000NodeConverter().convertImage(inputBuffer, 'bmp')).rejects.toThrow(
+      /Unsupported format/,
+    )
+  })
 })
diff --git a/lib/yarn.lock b/lib/yarn.lock
index c63735b..0539c25 100644
--- a/lib/yarn.lock
+++ b/lib/yarn.lock
@@ -421,7 +421,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@eslint-community/eslint-utils@npm:^4.2.0, @eslint-community/eslint-utils@npm:^4.4.0":
+"@eslint-community/eslint-utils@npm:^4.2.0":
   version: 4.6.1
   resolution: "@eslint-community/eslint-utils@npm:4.6.1"
   dependencies:
@@ -432,13 +432,31 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@eslint-community/regexpp@npm:^4.12.1, @eslint-community/regexpp@npm:^4.5.1":
+"@eslint-community/eslint-utils@npm:^4.9.1":
+  version: 4.9.1
+  resolution: "@eslint-community/eslint-utils@npm:4.9.1"
+  dependencies:
+    eslint-visitor-keys: ^3.4.3
+  peerDependencies:
+    eslint: ^6.0.0 || ^7.0.0 || >=8.0.0
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-  checksum: f983c706e0c22b0c0747a8e9c76aed6f391ba2d76734cf2757cd84da13417b402ed68fe25bace65228856c61d36d3b41da198f1ffbf33d0b34283a2f7a62c6e9
-  languageName: node
-  linkType: hard
-
 "fs-minipass@npm:^3.0.0":
   version: 3.0.3
   resolution: "fs-minipass@npm:3.0.3"
@@ -3766,20 +3801,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"globby@npm:^11.1.0":
-  version: 11.1.0
-  resolution: "globby@npm:11.1.0"
-  dependencies:
-    array-union: ^2.1.0
-    dir-glob: ^3.0.1
-    fast-glob: ^3.2.9
-    ignore: ^5.2.0
-    merge2: ^1.4.1
-    slash: ^3.0.0
-  checksum: b4be8885e0cfa018fc783792942d53926c35c50b3aefd3fdcfb9d22c627639dc26bd2327a40a0b74b074100ce95bb7187bfeae2f236856aa3de183af7a02aea6
-  languageName: node
-  linkType: hard
-
 "gopd@npm:^1.0.1, gopd@npm:^1.2.0":
   version: 1.2.0
   resolution: "gopd@npm:1.2.0"
@@ -3787,20 +3808,13 @@ __metadata:
   languageName: node
   linkType: hard
 
-"graceful-fs@npm:^4.1.11, graceful-fs@npm:^4.1.6, graceful-fs@npm:^4.2.0, graceful-fs@npm:^4.2.6, graceful-fs@npm:^4.2.9":
+"graceful-fs@npm:^4.1.11, graceful-fs@npm:^4.2.6, graceful-fs@npm:^4.2.9":
   version: 4.2.11
   resolution: "graceful-fs@npm:4.2.11"
   checksum: ac85f94da92d8eb6b7f5a8b20ce65e43d66761c55ce85ac96df6865308390da45a8d3f0296dd3a663de65d30ba497bd46c696cc1e248c72b13d6d567138a4fc7
   languageName: node
   linkType: hard
 
-"graphemer@npm:^1.4.0":
-  version: 1.4.0
-  resolution: "graphemer@npm:1.4.0"
-  checksum: bab8f0be9b568857c7bec9fda95a89f87b783546d02951c40c33f84d05bb7da3fd10f863a9beb901463669b6583173a8c8cc6d6b306ea2b9b9d5d3d943c3a673
-  languageName: node
-  linkType: hard
-
 "has-bigints@npm:^1.0.2":
   version: 1.1.0
   resolution: "has-bigints@npm:1.1.0"
@@ -3947,13 +3961,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"ignore@npm:^5.2.0, ignore@npm:^5.2.4":
+"ignore@npm:^5.2.0":
   version: 5.3.2
   resolution: "ignore@npm:5.3.2"
   checksum: 2acfd32a573260ea522ea0bfeff880af426d68f6831f973129e2ba7363f422923cf53aab62f8369cbf4667c7b25b6f8a3761b34ecdb284ea18e87a5262a865be
   languageName: node
   linkType: hard
 
+"ignore@npm:^7.0.5":
+  version: 7.0.5
+  resolution: "ignore@npm:7.0.5"
+  checksum: d0862bf64d3d58bf34d5fb0a9f725bec9ca5ce8cd1aecc8f28034269e8f69b8009ffd79ca3eda96962a6a444687781cd5efdb8c7c8ddc0a6996e36d31c217f14
+  languageName: node
+  linkType: hard
+
 "import-fresh@npm:^3.2.1":
   version: 3.3.1
   resolution: "import-fresh@npm:3.3.1"
@@ -5035,10 +5056,10 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "jp2-to-image@workspace:."
   dependencies:
-    "@types/fs-extra": ^11.0.4
     "@types/jest": ^29.5.14
     "@types/node": ^24.0.4
-    "@typescript-eslint/eslint-plugin": ^6.0.0
+    "@types/pngjs": ^6.0.5
+    "@typescript-eslint/eslint-plugin": ^8.35.0
     "@typescript-eslint/parser": ^8.35.0
     cpx: ^1.5.0
     eslint: ^9.30.0
@@ -5046,8 +5067,9 @@ __metadata:
     eslint-import-resolver-typescript: ^4.4.3
     eslint-plugin-import: ^2.31.0
     eslint-plugin-prettier: ^5.0.0
-    fs-extra: ^11.3.0
     jest: ^29.7.0
+    jpeg-js: ^0.4.4
+    pngjs: ^7.0.0
     prettier: ^3.2.5
     rimraf: ^6.0.1
     ts-jest: ^29.1.2
@@ -5057,6 +5079,13 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"jpeg-js@npm:^0.4.4":
+  version: 0.4.4
+  resolution: "jpeg-js@npm:0.4.4"
+  checksum: bd7cb61aa8df40a9ee2c2106839c3df6054891e56cfc22c0ac581402e06c6295f962a4754b0b2ac50a401789131b1c6dc9df8d24400f1352168be1894833c590
+  languageName: node
+  linkType: hard
+
 "js-tokens@npm:^4.0.0":
   version: 4.0.0
   resolution: "js-tokens@npm:4.0.0"
@@ -5151,19 +5180,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"jsonfile@npm:^6.0.1":
-  version: 6.1.0
-  resolution: "jsonfile@npm:6.1.0"
-  dependencies:
-    graceful-fs: ^4.1.6
-    universalify: ^2.0.0
-  dependenciesMeta:
-    graceful-fs:
-      optional: true
-  checksum: 7af3b8e1ac8fe7f1eccc6263c6ca14e1966fcbc74b618d3c78a0a2075579487547b94f72b7a1114e844a1e15bb00d440e5d1720bfc4612d790a6f285d5ea8354
-  languageName: node
-  linkType: hard
-
 "keyv@npm:^4.5.4":
   version: 4.5.4
   resolution: "keyv@npm:4.5.4"
@@ -5365,7 +5381,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"merge2@npm:^1.3.0, merge2@npm:^1.4.1":
+"merge2@npm:^1.3.0":
   version: 1.4.1
   resolution: "merge2@npm:1.4.1"
   checksum: 7268db63ed5169466540b6fb947aec313200bcf6d40c5ab722c22e242f651994619bcd85601602972d3c85bd2cc45a358a4c61937e9f11a061919a1da569b0c2
@@ -5431,15 +5447,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"minimatch@npm:9.0.3":
-  version: 9.0.3
-  resolution: "minimatch@npm:9.0.3"
-  dependencies:
-    brace-expansion: ^2.0.1
-  checksum: 253487976bf485b612f16bf57463520a14f512662e592e95c571afdab1442a6a6864b6c88f248ce6fc4ff0b6de04ac7aa6c8bb51e868e99d1d65eb0658a708b5
-  languageName: node
-  linkType: hard
-
 "minimatch@npm:^10.0.0":
   version: 10.0.1
   resolution: "minimatch@npm:10.0.1"
@@ -5449,6 +5456,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"minimatch@npm:^10.2.2":
+  version: 10.2.5
+  resolution: "minimatch@npm:10.2.5"
+  dependencies:
+    brace-expansion: ^5.0.5
+  checksum: 000423875fecbc7da1d74bf63c9081363a71291ef2588c376c45647ac004582cb5bc8cc09ef84420b26bfb490f4d0818d328e78569c6228e20d90271283f73ba
+  languageName: node
+  linkType: hard
+
 "minimatch@npm:^3.0.2, minimatch@npm:^3.0.4, minimatch@npm:^3.1.1, minimatch@npm:^3.1.2":
   version: 3.1.2
   resolution: "minimatch@npm:3.1.2"
@@ -6014,13 +6030,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"path-type@npm:^4.0.0":
-  version: 4.0.0
-  resolution: "path-type@npm:4.0.0"
-  checksum: 5b1e2daa247062061325b8fdbfd1fb56dde0a448fb1455453276ea18c60685bdad23a445dc148cf87bc216be1573357509b7d4060494a6fd768c7efad833ee45
-  languageName: node
-  linkType: hard
-
 "picocolors@npm:^1.0.0, picocolors@npm:^1.1.1":
   version: 1.1.1
   resolution: "picocolors@npm:1.1.1"
@@ -6042,6 +6051,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"picomatch@npm:^4.0.4":
+  version: 4.0.4
+  resolution: "picomatch@npm:4.0.4"
+  checksum: 76b387b5157951422fa6049a96bdd1695e39dd126cd99df34d343638dc5cdb8bcdc83fff288c23eddcf7c26657c35e3173d4d5f488c4f28b889b314472e0a662
+  languageName: node
+  linkType: hard
+
 "pirates@npm:^4.0.4":
   version: 4.0.7
   resolution: "pirates@npm:4.0.7"
@@ -6058,6 +6074,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"pngjs@npm:^7.0.0":
+  version: 7.0.0
+  resolution: "pngjs@npm:7.0.0"
+  checksum: b19a018930d27de26229c1b3ff250b3a25d09caa22cbb0b0459987d91eb0a560a18ab5d67da45a38ed7514140f26d1db58de83c31159ec101f2bb270a3c707f1
+  languageName: node
+  linkType: hard
+
 "posix-character-classes@npm:^0.1.0":
   version: 0.1.1
   resolution: "posix-character-classes@npm:0.1.1"
@@ -6501,6 +6524,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"semver@npm:^7.7.3":
+  version: 7.7.4
+  resolution: "semver@npm:7.7.4"
+  bin:
+    semver: bin/semver.js
+  checksum: 9b4a6a58e98b9723fafcafa393c9d4e8edefaa60b8dfbe39e30892a3604cf1f45f52df9cfb1ae1a22b44c8b3d57fec8a9bb7b3e1645431587cb272399ede152e
+  languageName: node
+  linkType: hard
+
 "set-function-length@npm:^1.2.2":
   version: 1.2.2
   resolution: "set-function-length@npm:1.2.2"
@@ -7038,6 +7070,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tinyglobby@npm:^0.2.15":
+  version: 0.2.16
+  resolution: "tinyglobby@npm:0.2.16"
+  dependencies:
+    fdir: ^6.5.0
+    picomatch: ^4.0.4
+  checksum: db9d22ce1deb1095720a683c492cd5e80da0f71fed21ed697e2752f6f298edd8a1249dab197c86a26f001c180594a81bf532400fe519791ed2a2cb57b03bc337
+  languageName: node
+  linkType: hard
+
 "tmpl@npm:1.0.5":
   version: 1.0.5
   resolution: "tmpl@npm:1.0.5"
@@ -7085,15 +7127,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"ts-api-utils@npm:^1.0.1":
-  version: 1.4.3
-  resolution: "ts-api-utils@npm:1.4.3"
-  peerDependencies:
-    typescript: ">=4.2.0"
-  checksum: ea00dee382d19066b2a3d8929f1089888b05fec797e32e7a7004938eda1dccf2e77274ee2afcd4166f53fab9b8d7ee90ebb225a3183f9ba8817d636f688a148d
-  languageName: node
-  linkType: hard
-
 "ts-api-utils@npm:^2.1.0":
   version: 2.1.0
   resolution: "ts-api-utils@npm:2.1.0"
@@ -7103,6 +7136,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ts-api-utils@npm:^2.5.0":
+  version: 2.5.0
+  resolution: "ts-api-utils@npm:2.5.0"
+  peerDependencies:
+    typescript: ">=4.8.4"
+  checksum: 5b2a2db7aa041d60b040df691ee5e73d534fb4cb3cf4fd6d2c27c584a32836a7ca8272fb23d865e673559ea639fdba35f8623249bf931df22188f0aaef7f0075
+  languageName: node
+  linkType: hard
+
 "ts-jest@npm:^29.1.2":
   version: 29.4.0
   resolution: "ts-jest@npm:29.4.0"
@@ -7370,13 +7412,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"universalify@npm:^2.0.0":
-  version: 2.0.1
-  resolution: "universalify@npm:2.0.1"
-  checksum: ecd8469fe0db28e7de9e5289d32bd1b6ba8f7183db34f3bfc4ca53c49891c2d6aa05f3fb3936a81285a905cc509fb641a0c3fc131ec786167eff41236ae32e60
-  languageName: node
-  linkType: hard
-
 "unrs-resolver@npm:^1.7.11":
   version: 1.9.1
   resolution: "unrs-resolver@npm:1.9.1"
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 0000000..fb57ccd
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,4 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+