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<!DOCTYPE html>
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<title>All 50 Free Developer Tools — Browse Catalog | FreeDevTool</title>
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<a class="nav-logo" href="/" aria-label="FreeDevTool home"><svg class="logo-mark" width="22" height="22" viewBox="0 0 24 24" aria-hidden="true" fill="none"><rect x="1" y="1" width="22" height="22" rx="6" fill="currentColor" opacity=".12"/><path d="M9.5 8.5L6 12l3.5 3.5M14.5 8.5L18 12l-3.5 3.5" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>FreeDevTool</a>
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<a href="encoding-tools"><div class="dd-icon">b64</div><div class="dd-info"><div class="dd-name">Encoding & Conversion</div><div class="dd-count">11 tools</div></div></a>
<a href="generation-tools"><div class="dd-icon">{ }</div><div class="dd-info"><div class="dd-name">Generation & Formatting</div><div class="dd-count">16 tools</div></div></a>
<a href="security-tools"><div class="dd-icon">#</div><div class="dd-info"><div class="dd-name">Security & Hashing</div><div class="dd-count">3 tools</div></div></a>
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<a href="network-tools"><div class="dd-icon">IP</div><div class="dd-info"><div class="dd-name">Network & Time</div><div class="dd-count">4 tools</div></div></a>
<a href="seo-tools"><div class="dd-icon">SEO</div><div class="dd-info"><div class="dd-name">SEO & Meta Tools</div><div class="dd-count">3 tools</div></div></a>
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<a href="all-tools"><div class="dd-icon">All</div><div class="dd-info"><div class="dd-name">All Tools</div><div class="dd-count">50 tools</div></div></a>
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<span class="badge">All Tools</span>
<h1>All Developer Tools</h1>
<p>Browse all 50 free developer tools. Everything runs in your browser — no signup, no server calls, no data collection.</p>
</div>
<div style="max-width:720px; margin:0 auto 40px; color:var(--text2); font-size:14px; line-height:1.7">
<p>FreeDevTool is a single-page reference for the small, repetitive tasks that take up too much of a developer's day — formatting a JSON response, decoding a JWT, generating a UUID, calculating a CIDR subnet, escaping a string for HTML. Every tool listed here is <strong style="color:var(--text)">100% client-side</strong>: the file you paste, the token you decode, the regex you test never leaves your browser. There's no account to create, no upgrade prompt, and no advertising.</p>
<p>The toolbox is organized into seven categories: <a href="encoding-tools" style="color:var(--accent); text-decoration:none">Encoding & Conversion</a> for the formats data needs to travel in (Base64, URL, hex, YAML); <a href="generation-tools" style="color:var(--accent); text-decoration:none">Generation & Formatting</a> for the things you produce or pretty-print (JSON, UUID, QR, gradients); <a href="security-tools" style="color:var(--accent); text-decoration:none">Security & Hashing</a> for everyday auth debugging (JWT decode, MD5/SHA hashes); <a href="text-tools" style="color:var(--accent); text-decoration:none">Code & Text Tools</a> for the regex/diff/markdown grind; <a href="devops-tools" style="color:var(--accent); text-decoration:none">Optimization & DevOps</a> for the build & ops side (minifiers, cron, chmod, cURL); <a href="network-tools" style="color:var(--accent); text-decoration:none">Network & Time</a> for IP/DNS/subnet math; and <a href="seo-tools" style="color:var(--accent); text-decoration:none">SEO & Meta Tools</a> for the meta tags, OG previews, and slugs that ship with every page.</p>
<p>Tools below are searchable by name, alias, or task — try <em>"jwt"</em>, <em>"slug"</em>, or <em>"chmod"</em> in the box. Bookmark this page if you find yourself opening the same set of tools every week.</p>
</div>
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<svg class="search-icon" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" aria-hidden="true"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.35-4.35"/></svg>
</div>
<!-- Encoding & Conversion -->
<p class="category-label">Encoding & Conversion</p>
<div class="tools-grid" data-category>
<a class="tool-tile featured" href="base64-encoder" data-name="base64 encoder decoder encode decode">
<div class="tile-icon">b64</div>
<div class="tile-body">
<div class="tile-name">Base64 Encoder / Decoder</div>
<div class="tile-desc">Encode and decode Base64 strings instantly.</div>
</div>
<span class="tile-badge">Popular</span>
</a>
<a class="tool-tile" href="unix-timestamp-converter" data-name="unix timestamp converter epoch time date">
<div class="tile-icon">⏱</div>
<div class="tile-body">
<div class="tile-name">UNIX Timestamp Converter</div>
<div class="tile-desc">Convert between UNIX epoch and human-readable dates.</div>
</div>
</a>
<a class="tool-tile" href="url-encoder" data-name="url encoder decoder percent encoding query string">
<div class="tile-icon">%</div>
<div class="tile-body">
<div class="tile-name">URL Encoder / Decoder</div>
<div class="tile-desc">Encode and decode URL percent-encoded strings.</div>
</div>
</a>
<a class="tool-tile" href="hex-to-rgb" data-name="hex rgb rgba hsl color converter css">
<div class="tile-icon">🎨</div>
<div class="tile-body">
<div class="tile-name">Hex to RGB Converter</div>
<div class="tile-desc">Convert hex color codes to RGB, RGBA, and HSL.</div>
</div>
</a>
<a class="tool-tile" href="html-entity" data-name="html entity encoder decoder special characters xss">
<div class="tile-icon">&</div>
<div class="tile-body">
<div class="tile-name">HTML Entity Encoder / Decoder</div>
<div class="tile-desc">Encode and decode HTML entities and special characters.</div>
</div>
</a>
<a class="tool-tile" href="base64-image" data-name="image base64 encoder data uri png jpg svg">
<div class="tile-icon">🖼</div>
<div class="tile-body">
<div class="tile-name">Image to Base64 Encoder</div>
<div class="tile-desc">Convert images to Base64 data URIs for embedding.</div>
</div>
</a>
<a class="tool-tile" href="json-to-csv" data-name="json csv converter download excel google sheets">
<div class="tile-icon">CSV</div>
<div class="tile-body">
<div class="tile-name">JSON to CSV Converter</div>
<div class="tile-desc">Convert JSON arrays to downloadable CSV files.</div>
</div>
</a>
<a class="tool-tile" href="number-base" data-name="number base converter binary decimal hex octal radix">
<div class="tile-icon">01</div>
<div class="tile-body">
<div class="tile-name">Number Base Converter</div>
<div class="tile-desc">Convert between binary, decimal, hex, and octal.</div>
</div>
</a>
<a class="tool-tile" href="yaml-to-json" data-name="yaml to json converter yaml2json configuration serialization">
<div class="tile-icon">Y→J</div>
<div class="tile-body">
<div class="tile-name">YAML to JSON Converter</div>
<div class="tile-desc">Convert between YAML and JSON formats instantly.</div>
</div>
</a>
<a class="tool-tile" href="byte-converter" data-name="byte converter kb mb gb tb data size unit">
<div class="tile-icon">GB</div>
<div class="tile-body">
<div class="tile-name">Byte/Data Size Converter</div>
<div class="tile-desc">Convert between bytes, KB, MB, GB, TB and more.</div>
</div>
</a>
<a class="tool-tile" href="px-to-rem" data-name="px to rem converter pixel em css responsive font size base">
<div class="tile-icon">rem</div>
<div class="tile-body">
<div class="tile-name">Pixel to REM Converter</div>
<div class="tile-desc">Bidirectional px ↔ rem ↔ em with adjustable base.</div>
</div>
<span class="tile-badge">New</span>
</a>
</div>
<!-- Generation & Formatting -->
<p class="category-label">Generation & Formatting</p>
<div class="tools-grid" data-category>
<a class="tool-tile" href="uuid-generator" data-name="uuid generator v4 guid unique id">
<div class="tile-icon">uid</div>
<div class="tile-body">
<div class="tile-name">UUID Generator</div>
<div class="tile-desc">Generate random v4 UUIDs and GUIDs.</div>
</div>
</a>
<a class="tool-tile featured" href="json-formatter" data-name="json formatter validator pretty print beautifier">
<div class="tile-icon">{ }</div>
<div class="tile-body">
<div class="tile-name">JSON Formatter & Validator</div>
<div class="tile-desc">Pretty print, validate, and format JSON data.</div>
</div>
<span class="tile-badge">Popular</span>
</a>
<a class="tool-tile" href="lorem-ipsum" data-name="lorem ipsum generator placeholder dummy text">
<div class="tile-icon">Aa</div>
<div class="tile-body">
<div class="tile-name">Lorem Ipsum Generator</div>
<div class="tile-desc">Generate placeholder text for mockups and designs.</div>
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<a class="tool-tile" href="password-generator" data-name="password generator strong random secure">
<div class="tile-icon">🔑</div>
<div class="tile-body">
<div class="tile-name">Password Generator</div>
<div class="tile-desc">Create strong, secure random passwords.</div>
</div>
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<a class="tool-tile" href="qr-generator" data-name="qr code generator url wifi barcode">
<div class="tile-icon">QR</div>
<div class="tile-body">
<div class="tile-name">QR Code Generator</div>
<div class="tile-desc">Generate QR codes for URLs, text, and Wi-Fi.</div>
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<a class="tool-tile" href="color-picker" data-name="color picker palette generator harmony complementary contrast">
<div class="tile-icon">🎨</div>
<div class="tile-body">
<div class="tile-name">Color Palette Generator</div>
<div class="tile-desc">Generate color palettes with harmony and contrast tools.</div>
</div>
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<a class="tool-tile" href="slug-generator" data-name="url slug generator seo friendly permalink kebab case">
<div class="tile-icon">🔗</div>
<div class="tile-body">
<div class="tile-name">URL Slug Generator</div>
<div class="tile-desc">Create SEO-friendly URL slugs from any text.</div>
</div>
</a>
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<div class="tile-icon">SQL</div>
<div class="tile-body">
<div class="tile-name">SQL Formatter & Beautifier</div>
<div class="tile-desc">Format, beautify and minify SQL queries.</div>
</div>
<span class="tile-badge">Popular</span>
</a>
<a class="tool-tile" href="xml-formatter" data-name="xml formatter beautifier validator pretty print indent">
<div class="tile-icon">XML</div>
<div class="tile-body">
<div class="tile-name">XML Formatter & Validator</div>
<div class="tile-desc">Format, validate and beautify XML documents.</div>
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<a class="tool-tile" href="css-gradient" data-name="css gradient generator linear radial conic background">
<div class="tile-icon">🌈</div>
<div class="tile-body">
<div class="tile-name">CSS Gradient Generator</div>
<div class="tile-desc">Create CSS gradients with a visual editor.</div>
</div>
</a>
<a class="tool-tile" href="meta-tag-generator" data-name="meta tag generator seo title description open graph twitter card">
<div class="tile-icon">SEO</div>
<div class="tile-body">
<div class="tile-name">Meta Tag Generator</div>
<div class="tile-desc">Generate SEO meta tags and Open Graph markup.</div>
</div>
</a>
<a class="tool-tile" href="og-preview" data-name="open graph preview social media card facebook twitter linkedin">
<div class="tile-icon">OG</div>
<div class="tile-body">
<div class="tile-name">OG Preview Tool</div>
<div class="tile-desc">Preview how your page looks on social media.</div>
</div>
</a>
<a class="tool-tile" href="css-box-shadow" data-name="css box shadow generator visual sliders material soft neon inset layers">
<div class="tile-icon">▣</div>
<div class="tile-body">
<div class="tile-name">CSS Box Shadow Generator</div>
<div class="tile-desc">Build multi-layer box-shadows with visual sliders.</div>
</div>
<span class="tile-badge">New</span>
</a>
<a class="tool-tile" href="wcag-contrast" data-name="wcag contrast checker accessibility aa aaa ratio color blind a11y foreground background">
<div class="tile-icon">Aa</div>
<div class="tile-body">
<div class="tile-name">WCAG Contrast Checker</div>
<div class="tile-desc">Check AA/AAA contrast ratios with live pass/fail.</div>
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<span class="tile-badge">New</span>
</a>
<a class="tool-tile" href="color-name" data-name="color name from hex nearest css named color tomato dodgerblue 147">
<div class="tile-icon">🎨</div>
<div class="tile-body">
<div class="tile-name">Color Name from Hex</div>
<div class="tile-desc">Find the nearest CSS named color for any hex value.</div>
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<span class="tile-badge">New</span>
</a>
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<!-- Security & Hashing -->
<p class="category-label">Security & Hashing</p>
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<a class="tool-tile featured" href="jwt-decoder" data-name="jwt decoder token inspector oauth bearer">
<div class="tile-icon">jwt</div>
<div class="tile-body">
<div class="tile-name">JWT Decoder & Inspector</div>
<div class="tile-desc">Decode and inspect JWT tokens, headers, and claims.</div>
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<a class="tool-tile" href="hash-generator" data-name="hash generator md5 sha256 sha512 sha1 checksum">
<div class="tile-icon">#</div>
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<div class="tile-name">Hash Generator — MD5 / SHA</div>
<div class="tile-desc">Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.</div>
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<a class="tool-tile" href="jwt-generator" data-name="jwt generator token creator hs256 hs512 json web token">
<div class="tile-icon">jwt</div>
<div class="tile-body">
<div class="tile-name">JWT Generator</div>
<div class="tile-desc">Create signed JWT tokens for testing and development.</div>
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<p class="category-label">Code & Text Tools</p>
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<a class="tool-tile featured" href="regex-tester" data-name="regex tester regular expression debugger pattern matcher">
<div class="tile-icon">.*</div>
<div class="tile-body">
<div class="tile-name">Regex Tester & Debugger</div>
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<a class="tool-tile" href="regex-explainer" data-name="regex explainer translator plain english breakdown">
<div class="tile-icon">?=</div>
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<div class="tile-name">Regex Explainer</div>
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<div class="tile-icon">Aa</div>
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<div class="tile-name">String Case Converter</div>
<div class="tile-desc">Convert between camelCase, snake_case, kebab-case, and more.</div>
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<div class="tile-icon">\\</div>
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<div class="tile-name">String Escape & Unescape</div>
<div class="tile-desc">Escape and unescape strings for JSON, HTML, and URLs.</div>
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<div class="tile-icon">Σ</div>
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<div class="tile-name">Character / String Length Counter</div>
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<a class="tool-tile" href="word-to-markdown" data-name="word to markdown converter text rich google docs paste html gfm">
<div class="tile-icon">MD</div>
<div class="tile-body">
<div class="tile-name">Word / Rich Text to Markdown</div>
<div class="tile-desc">Convert pasted Word or HTML content to clean Markdown.</div>
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<span class="tile-badge">New</span>
</a>
<a class="tool-tile" href="ai-token-counter" data-name="ai token counter gpt claude cost estimator openai anthropic pricing llm prompt">
<div class="tile-icon">AI</div>
<div class="tile-body">
<div class="tile-name">AI Token Counter</div>
<div class="tile-desc">Estimate GPT / Claude tokens and cost for any prompt.</div>
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<span class="tile-badge">New</span>
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<p class="category-label">Optimization & DevOps</p>
<div class="tools-grid" data-category>
<a class="tool-tile" href="css-minifier" data-name="css minifier beautifier compress optimize">
<div class="tile-icon">CSS</div>
<div class="tile-body">
<div class="tile-name">CSS Minifier & Beautifier</div>
<div class="tile-desc">Minify or beautify CSS code instantly.</div>
</div>
</a>
<a class="tool-tile" href="js-minifier" data-name="javascript minifier beautifier compress uglify js">
<div class="tile-icon">JS</div>
<div class="tile-body">
<div class="tile-name">JavaScript Minifier & Beautifier</div>
<div class="tile-desc">Minify or beautify JavaScript code.</div>
</div>
</a>
<a class="tool-tile" href="cron-parser" data-name="cron expression generator parser crontab scheduler">
<div class="tile-icon">⏰</div>
<div class="tile-body">
<div class="tile-name">Cron Expression Generator</div>
<div class="tile-desc">Build and parse cron expressions with a visual editor.</div>
</div>
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<a class="tool-tile" href="chmod-calculator" data-name="chmod calculator unix file permissions octal linux">
<div class="tile-icon">rwx</div>
<div class="tile-body">
<div class="tile-name">Chmod Calculator</div>
<div class="tile-desc">Calculate Unix file permissions interactively.</div>
</div>
</a>
<a class="tool-tile" href="http-status" data-name="http status codes reference 404 500 200 301 api rest">
<div class="tile-icon">200</div>
<div class="tile-body">
<div class="tile-name">HTTP Status Code Reference</div>
<div class="tile-desc">Browse all HTTP status codes with descriptions.</div>
</div>
</a>
<a class="tool-tile" href="html-minifier" data-name="html minifier online beautifier compress optimize whitespace comments">
<div class="tile-icon"><></div>
<div class="tile-body">
<div class="tile-name">HTML Minifier & Beautifier</div>
<div class="tile-desc">Minify or pretty-print HTML with live byte savings.</div>
</div>
<span class="tile-badge">New</span>
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<a class="tool-tile" href="http-request-builder" data-name="http request builder curl fetch axios python requests node generator">
<div class="tile-icon">cURL</div>
<div class="tile-body">
<div class="tile-name">HTTP Request Builder</div>
<div class="tile-desc">Build requests and export as cURL, fetch, axios, Python.</div>
</div>
<span class="tile-badge">New</span>
</a>
<a class="tool-tile" href="git-cheatsheet" data-name="git commands cheatsheet reference branch merge rebase stash tag clone">
<div class="tile-icon">⎇</div>
<div class="tile-body">
<div class="tile-name">Git Commands Cheatsheet</div>
<div class="tile-desc">Searchable reference of 60+ git commands with copy.</div>
</div>
<span class="tile-badge">New</span>
</a>
</div>
<!-- Network & Time -->
<p class="category-label">Network & Time</p>
<div class="tools-grid" data-category>
<a class="tool-tile featured" href="ip-lookup" data-name="ip address lookup subnet calculator cidr ipv4 ipv6 network">
<div class="tile-icon">IP</div>
<div class="tile-body">
<div class="tile-name">IP Address Lookup & Analyzer</div>
<div class="tile-desc">Look up IP address details, geolocation, and subnet info.</div>
</div>
<span class="tile-badge new">New</span>
</a>
<a class="tool-tile" href="timestamp-diff" data-name="timestamp diff calculator time difference duration unix epoch">
<div class="tile-icon">⏱</div>
<div class="tile-body">
<div class="tile-name">Timestamp Diff Calculator</div>
<div class="tile-desc">Calculate the difference between two timestamps.</div>
</div>
</a>
<a class="tool-tile" href="dns-lookup" data-name="dns lookup tool a aaaa mx txt ns cname soa caa cloudflare doh">
<div class="tile-icon">DNS</div>
<div class="tile-body">
<div class="tile-name">DNS Lookup Tool</div>
<div class="tile-desc">Query A, AAAA, CNAME, MX, TXT, NS records via DoH.</div>
</div>
<span class="tile-badge">New</span>
</a>
<a class="tool-tile" href="relative-time" data-name="relative time calculator timestamp ago from now human readable duration">
<div class="tile-icon">⏲</div>
<div class="tile-body">
<div class="tile-name">Relative Time Calculator</div>
<div class="tile-desc">Convert timestamps to "3 days ago", "in 2 hours".</div>
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<span class="tile-badge">New</span>
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