v4.2.0

Mass Image Compressor Release Version 4.2.0

Scope: Ability to skip already compressed files, Stability, performance wins for larger batches, smarter filtering, UX polish

• Up to 8x faster file scanning when loading large folders. Improves multi-core efficiency.
• Skip if Compressed: avoids re-writing files that already exist at the output location.
  GitHub
• Smarter filters UI: explicit glob (.jpg|.png) and regex modes, no more “Apply Filter” button, and a clear “filter summary” indicator.
• Broader format support + safer preview (skip images that can’t be viewed/compressed) and dependency updates.
• Stability Improvements
  • Skip showing corrupt images in preview. [crash prevention]
  • Installer cleans older version before installing new one. Cached settings like window size and previous compression settings are untouched.
  • VC Runtime issue resolved.
  • Other minor stability improvements in UI.

File Integrity Check

FILENAME	SHA256
MassImageCompressorInstallerV4_2_0.exe	788A06B5A81162A62DA8601269CB284CC6408847DBCD33ADE1105D030351DFC0
MassImageCompressorPortableV4_2_0.zip	44A7D4240D198831EDA6DA351DDD59C050D2E6B278929DA1157E12DF75BCCEE4

v4.1.0

New Features

• Can add custom watermark (image)

Change In Feature

• Output folder setting is moved from settings panel to top panel, below input folder selection. This make it easy for 3.x users to adapt.

Bug Fixes

• Fixes in animated images (especially PNG) compression
• [UI Fix] Resize shortcut (i.e. shd/hd/uhd etc) gives only long edge value of selected shortcut
• [UI Fix] Initial text of show/hide filter corrected

File Integrity Check

SHA256: ABE4C2B32BCF7A23E9A57266088DE153664FE5910CD5F1128A16B28106C8D8CB

FILENAME	SHA256
MassImageCompressorInstallerV4_1_0.exe	ABE4C2B32BCF7A23E9A57266088DE153664FE5910CD5F1128A16B28106C8D8CB
MassImageCompressorPortableV4_1_0.zip	A53163CD96B7BDAB316CC19FF0A79CBD15D29FE817299697BB20F9F5549C9FC0

v4.0.2

Dependency Updates

• Magick.NET-Q8-OpenMP-x64 (14.5.0 to 14.7.0, hang issue, security issues)
• MS App SDK 1.6.250108002 to 1.7.250606001 (Stability Improvement)

See c7ee772d9b for more details about dependency changes.

v4.0.1

Mass Image Compressor v4.0.0 – First Stable Release in 4.x Series

This is the first stable release of the 4.x series, a complete rewrite of Mass Image Compressor from scratch using modern WinUI 3 and .NET 8 technologies.

Rewritten from the Ground Up

• Entire architecture reengineered to support scalability, performance, and modern UI responsiveness.

Expanded Format Support

• Additional input and output image formats are now supported, increasing compatibility with a broad spectrum of image files.
• Input Formats: JPG/JPEG, PNG, WebP, TIFF, GIF, BMP, AVIF, HEIC, JP2, and RAW formats including ARW, DNG, NEF, CR2, CR3, CRW, DCR, KDC, MRW, ORF, RAF, PEF, RW2, SRW, ERF, 3FR, MOS, MEF.
• Output Formats: JPG, PNG, WebP, AVIF, and GIF.

Feature Enhancements

• Animated image handling (e.g., animated WebP and GIF)
• Improved preview mode with side-by-side compression comparison
• File selection filters by extension, file size, and visibility
• Multi-item drag and drop support
• Gallery view modes for better image organization and visibility
• Comprehensive compression settings including quality, dimension strategies, and file naming rules

Smarter Output Management

• Flexible output location strategies: replace original, custom folder, or maintain folder structure
• Intelligent handling of existing files with detailed pre/post-compression warnings

Other Improvements

• Throttled task scheduling for responsive UI performance
• Enhanced support for preserving EXIF and other metadata, exclude sensitive metadata

Other Info

More info at: https://mic.cognirush.com/windows/
The same release is also hosted on Mass Image Compressor's official distribution site https://sourceforge.net/projects/icompress/

File Integrity Check

SHA256: 542E76E8D672661993F125B883FABA4CAB9AFE51734970781B25D4C4FD9F3278