CompressImage

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A lightweight desktop tool built with Python + Tkinter for:

• Image compression
• File compression
• File hash calculation (MD5 / SHA1 / SHA256)
• MD5 modification (change file MD5 without affecting visible content)

Features

1. Image Compression

• Supports JPG / PNG / WEBP / BMP / TIFF
• Supports selecting a whole image folder
• Supports recursive batch processing for subfolders
• Keeps the original file name after compression
• Output format options: Keep Original / JPEG / WEBP / PNG
• Adjustable quality for lossy formats
• Resize options: keep original, scale by percentage, limit the longest edge, or set custom width/height
• Custom width and height can use different ratios, and the image will be stretched automatically
• A Lock aspect ratio option is available for custom width/height resizing
• PNG modes: Standard PNG and Tinify-like PNG
• Single-file mode outputs to compressed_output next to the source image
• Folder mode outputs to compressed_output under the selected folder while preserving relative structure
• Built-in thumbnail preview for the first few selected images

2. File Compression

• Supports selecting a whole folder
• Supports recursive file collection before archiving
• Supports zip
• Supports tar.gz
• Supports tar.xz
• Supports single-file gz
• Folder mode preserves directory structure inside the archive

3. Hash Calculation

• Calculate MD5
• Calculate SHA1
• Calculate SHA256

4. MD5 Modification

• Change the MD5 hash of any file without affecting its visible content
• Appends random bytes to a copy of the file
• Supports batch processing and folder recursion
• Preserves directory structure in the output md5_modified folder
• Displays before and after MD5 values

UI Highlights

• Dark header with status cards
• Clear tab-based workflow
• Scrollable result logs
• Bottom status bar for current progress
• Drag and drop support for files and folders

Drag & Drop

• tkinterdnd2 is included in requirements.txt
• Reinstall dependencies once before first use if needed

Tinify-like PNG Mode

• Uses imagequant for 256-color palette quantization
• Uses no dithering by default to better match the tested Tinify PNG samples
• Uses a fixed quantization quality range of 40~90
• Runs an extra PNG optimization pass with zopfli when available
• Falls back to standard PNG compression automatically if dependencies are missing

Run

Install dependencies:

python3 -m pip install -r requirements.txt

Start the app:

python3 app.py

Possible Next Improvements

• Better drag-hover effects
• Image resize options
• Lossless/lossy WebP switch
• Export hash lists to text files
• Package as macOS / Windows desktop app