bulk_file_renamer.py

import os  # lets us work with files and folders

# Folder containing your photos
folder_path = os.path.expanduser("~/image_folder")  # change if needed

# The new name you want for your files
new_prefix = "Vacation"

# Get a list of all files in the folder
files = os.listdir(folder_path)

# Sort files so they are renamed in order (important!)
files.sort()

# Counter starts at 1
counter = 1

# Go through each file
for filename in files:

    # Get full file path
    old_file_path = os.path.join(folder_path, filename)

    # Skip folders (only rename files)
    if os.path.isdir(old_file_path):
        continue

    # Split filename into name and extension
    # Example: "IMG_001.jpg" → ("IMG_001", ".jpg")
    name, extension = os.path.splitext(filename)

    # Create new filename with leading zeros (001, 002, etc.)
    new_name = f"{new_prefix}_{counter:03d}{extension}"

    # Create full path for the new file name
    new_file_path = os.path.join(folder_path, new_name)

    # Rename the file
    os.rename(old_file_path, new_file_path)

    print(f"Renamed: {filename} → {new_name}")

    # Increase counter for next file
    counter += 1