Mass Image Compressor

Mass Image Compressor is a fast, lightweight batch image processing tool that compresses, resizes, watermark and converts images to popular formats like JPEG XL, WebP, AVIF, JPEG, PNG, and GIF — reducing file size while preserving quality.
This official source code of modern version of Mass Image Compressor redesigned with a modern WinUI 3 interface and built on .NET 10 for Windows 10 and 11. This project is originally hosted on SourceForge.net and we still maintain it on SourceForge. Github repo also maintains exact same source code and it helps us support distribution channels such as Winget.

Project website: https://mic.cognirush.com/windows/

Donlowad and Install

Windows 10 and above, Windows Server 2019 and above

This project releases Installer and Portable (no installation required) packages on SourceForge.net and Github.

Other options,

Option 2: Winget

You can use winget method to install the same build (released on github) with below command.

winget source update
winget install --id=Cognirush.MassImageCompressor -e

More details here

Option 4: Use Microsoft Store

Get signed installer from Microsoft Store (one-time purchase to support the project). You get auto-update feature and Windows security is cool with it as the installer is signed. Store build has no other extra features, it is created from the same source.

Related software (not this source repository)

We have built Mass Image Compressor for other platforms too. Each is a separate project with its own source and distribution.

Windows 7, 8.x (v3.3.3)

Mass Image Compressor 3.x is old version that supports Windows 7 and 8. It is available from our SourceForge project. Source (GPLv3) is in its SVN repo. Version 3 is no longer actively maintained.

macOS 13+

Written in Swift by us, closed source at present. Get it from the Mac App Store.

Web app (PWA)

Works on Android and in browsers (iOS/iPadOS in testing). Live at massimg.com, source (AGPLv3) at massimg-web.

Features

• Compress multiple folders and files in one go (including optional subfolders)
• Seamless Windows Explorer integration via the "Send To" menu (enabled if application is launched atleast once)
• Advanced metadata copy settings (EXIF, XMP, IPTC) with filtering (e.g., strip GPS, serial numbers)
• Full support for Animated Images (GIF, PNG, WebP)
• Output to modern formats like JPEG XL, WebP and AVIF
• Regex filters for filenames and size-based exclusions
• Suffix/Prefix options and filename text replacement for output files
• Powerful Preview UI with pixel-level image comparison (CTRL + T)
• Robust and faster RAW image support
• Multiple flexible output destination modes:
• Replace original files
• Output to specific folder
• Store next to original with suffix/prefix
• Inside a Compressed subfolder
• Flexible resizing:
• By percentage
• Long edge, fixed width/height
• Frame-based for print or responsive image sets (1x/2x/3x)
• Watermark Image (v4.1.0 and above)

Screenshots

See screenshots directory if you cannot view below images.

Built With & Credits

This project makes use of the following libraries and tools:

• Magick.NET (github.com) - Image conversion & manipulation, this is a .NET port of ImageMagick
• ExifTool - Metadata reading and writing
• APNG Optimizer - Optimization for animated PNGs
• FFmpeg - Underlying video and animation encoding/decoding via Magick.NET
• OxiPNG - PNG compression
• Serilog - Flexible logging infrastructure
• Gifsicle - Editing and creating GIF images
• pngquant - For compressing PNGs with lesser colors
• Inno Setup - For install setup binary

Other tools & credits used during development:

• Font Awesome - Used free fonts for emojies
• Signature Edits - For RAW image testing and screenshots.
• Krita - Used for graphics editing (screenshots etc.)
• Paint.NET (www.getpaint.net) - Used for graphics editing

Community & Feedback

We're collecting feedback during this rewrite phase. Join the discussion or report issues to help stabilize the new generation of Mass Image Compressor. If you have a functional feedback, provide it here.

You can also create an issue/request on Github (public) or contact our support https://mic.cognirush.com/contact-us/ (private).

Support Development

If you find this project helpful, consider supporting its development. Test, Report Bugs, or just share it with friends!

Please read LICENSE and NOTICE.txt. If you're sharing a custom build, just make sure to remove the Cognirush Labs support email or contact links, otherwise folks might email/contact me about something I didn't build, and I won't be able to help (or worse, give them the wrong advice). Appreciate the understanding!

Have a great image compression today!