FileOptimizer
nikkhokkho.sourceforge.io
What it is
FileOptimizer is a free Windows program that recompresses already-compressed files to reduce their size while retaining their format and behavior. It supports batch processing and accepts files through its interface or command line; optimization replaces them with optimized versions. The maker says it handles more than 600 file extensions and identifies types by examining file contents, regardless of 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. By default, it removes extra metadata and keeps originals in the recycle bin. The program includes more than 90 third-party tools as plugins and supports command-line automation. It is provided under the GNU Affero General Public License, free for personal and commercial use without feature limits. The maker lists Windows XP through Windows 11 and Server 2022 among its requirements. Lossy options are also documented for PNG, JPEG, and GIF.
Spec sheet
- Purpose
- FileOptimizer recompresses already compressed files to reduce their size while preserving their format and behavior.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Deployment
- The maker lists deployment restrictions for the current user and all users, and documents silent installation and an all-users installer option.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Free plan
- YesRead 20 Sep 2026 · nikkhokkho.sourceforge.io
- 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.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- 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.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Automation
- The maker describes command-line automation and says files or directories can be passed to the program for processing.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Batch processing
- YesRead 20 Sep 2026 · nikkhokkho.sourceforge.io
- Compression modes
- losslessRead 20 Sep 2026 · nikkhokkho.sourceforge.io
- Downloads
- The maker offers Windows x86 and x64 executables in installer and portable-capable 7z SFX distributions, plus a source archive.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- File support
- The maker says it supports more than 600 file extensions and detects file types by analyzing file contents, regardless of their extensions.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Integrated tools
- The program includes more than 90 third-party tools as plugins.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Lossy options
- Although the product is described as lossless by default, the maker documents options that enable lossy optimization for PNG, JPEG, and GIF.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Metadata and originals
- By default, it removes additional metadata and unneeded information, while keeping original files in the recycle bin.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Metadata controls
- YesRead 20 Sep 2026 · nikkhokkho.sourceforge.io
- 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.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- PDF limitation
- The maker notes that PDF optimization can downsample images and reduce quality, with a profile setting to control this.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Security guidance
- The maker warns that repackaged downloads from torrent and warez sites may contain malware and recommends downloading from the official page.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- 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,WEBPRead 20 Sep 2026 · nikkhokkho.sourceforge.io
- 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.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
- Workflow
- Users can add files in the interface or by command line, and optimization overwrites the files with optimized versions.Read 11 Oct 2026 · nikkhokkho.sourceforge.io
Plans and prices
FileOptimizer Free Free for personal and commercial use · full version without limitations Read 11 Oct 2026 · nikkhokkho.sourceforge.io
Strong points and limits
Strong points
- Free for personal and commercial use.
- Supports batch processing and command-line automation.
- Identifies file types by analyzing contents.
- Keeps originals in the recycle bin by default.
- Supports more than 600 file extensions.
Limits
- Optimization overwrites files with optimized versions.
- Lossy options exist for PNG, JPEG, and GIF.
- PDF optimization can reduce image quality.
Who it suits
FileOptimizer suits Windows users who want batch recompression and command-line automation, including for personal or commercial use. Its broad extension support may be useful when file types do not reliably match their extensions.
Verdict
FileOptimizer offers broad file support, batch handling, and command-line workflows at no charge. Note that optimization overwrites working files, and some options can be lossy, including PDF image downsampling.
Where Specifiction places it
- File Compression Software#7 of 368.1
- Image Compression Software#22 of 858.3
