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FileOptimizer
What it is
FileOptimizer is a free Windows program that recompresses already-compressed files to reduce their size while preserving their format and behavior. It supports more than 600 file extensions and identifies file types by examining file contents, regardless of the extension. Listed formats include APNG, AVIF, BMP, BPG, DDS, DNG, GIF, HEIC, HEIF, ICO, J2C, J2K, JP2, JPEG, JPG, JXL, MNG, MPO, PCX, PNG, PSD, SVG, TGA, TIF, TIFF and WEBP. Files can be added through the interface or command line, and optimization overwrites them with optimized versions. By default, the program removes extra metadata and keeps originals in the recycle bin. It includes more than 90 third-party tools as plugins and supports command-line automation. The maker provides it under the GNU Affero General Public License, with personal and commercial use free of charge and no feature limits. Listed requirements include Windows XP through Windows 11 and Server 2022. Although lossless by default, documented options enable lossy optimization for PNG, JPEG and GIF.
For and against
For
- Free for personal and commercial use.
- Supports batch processing and command-line automation.
- Recognizes file types by analyzing content.
- Keeps original files in the recycle bin by default.
- Supports more than 600 file extensions.
Against
- Optimization overwrites files.
- Listed platform is Windows.
- Lossy options are available for PNG, JPEG and GIF.
The verdict
FileOptimizer offers free file recompression, broad format support and command-line automation for Windows. Users should note that it overwrites optimized files, although originals are kept in the recycle bin by default.
Who it suits
It suits Windows users who want to reduce supported file sizes in batches or through command-line automation. Its free personal and commercial use may also suit organizations with compatible file workflows.
Plans and prices
FileOptimizer
Free for personal and commercial use · full version without limitations
Read 11 Oct 2026 · nikkhokkho.sourceforge.io
On the record
- Automation
- The maker describes command-line automation and says files or directories can be passed to the program for processing.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Batch processing
- Yesnikkhokkho.sourceforge.io · read 20 Sep 2026
- Compression modes
- losslessnikkhokkho.sourceforge.io · read 20 Sep 2026
- Deployment
- The maker lists deployment restrictions for the current user and all users, and documents silent installation and an all-users installer option.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Downloads
- The maker offers Windows x86 and x64 executables in installer and portable-capable 7z SFX distributions, plus a source archive.nikkhokkho.sourceforge.io · read 11 Oct 2026
- File support
- The maker says it supports more than 600 file extensions and detects file types by analyzing file contents, regardless of their extensions.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Integrated tools
- The program includes more than 90 third-party tools as plugins.nikkhokkho.sourceforge.io · read 11 Oct 2026
- License
- The program is provided free of charge under the GNU Affero General Public License, and the maker says personal and commercial use is free without feature limitations.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Lossy options
- Although the product is described as lossless by default, the maker documents options that enable lossy optimization for PNG, JPEG, and GIF.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Metadata and originals
- By default, it removes additional metadata and unneeded information, while keeping original files in the recycle bin.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Metadata controls
- Yesnikkhokkho.sourceforge.io · read 20 Sep 2026
- Other operating systems
- The maker reports that the Windows program works in some Linux and macOS environments through Wine, or in a Windows virtual machine.nikkhokkho.sourceforge.io · read 11 Oct 2026
- PDF limitation
- The maker notes that PDF optimization can downsample images and reduce quality, with a profile setting to control this.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Purpose
- FileOptimizer recompresses already compressed files to reduce their size while preserving their format and behavior.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Security guidance
- The maker warns that repackaged downloads from torrent and warez sites may contain malware and recommends downloading from the official page.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Support
- The maker points users to SourceForge discussions for suggestions and bug reports and does not guarantee support or answers for users outside the community.nikkhokkho.sourceforge.io · read 11 Oct 2026
- Supported formats
- APNG,AVIF,BMP,BPG,DDS,DNG,GIF,HEIC,HEIF,ICO,J2C,J2K,JP2,JPEG,JPG,JXL,MNG,MPO,PCX,PNG,PSD,SVG,TGA,TIF,TIFF,WEBPnikkhokkho.sourceforge.io · read 20 Sep 2026
- Windows requirements
- The listed requirements include Windows XP through Windows 11 and Server 2022, 128 MB of free memory, and 300 MB of disk space.nikkhokkho.sourceforge.io · read 11 Oct 2026
