FileOptimizer 17.10.2857 – Best Lossless File Compression

FileOptimizer is advanced file optimization software that reduces file sizes without losing any quality. This means your photos, documents, videos and audio files get smaller while looking and working exactly the same.

The software is completely free and open source under the GNU Affero General Public License (AGPL). Created by developer Javier Gutiérrez Chamorro (Guti), FileOptimizer has become one of the most comprehensive file compression tools available today.

What makes FileOptimizer special is its support for over 600 file extensions – more than any other tool in this category. Whether you have images, office documents, videos, audio files, databases or even executable files, FileOptimizer can make them smaller.

How FileOptimizer Works – The Simple Explanation

FileOptimizer uses something called “lossless compression” which means it squeezes files to make them smaller without changing how they look or work. Think of it like organizing a messy closet – everything stays the same but takes up less space.

The software includes more than 90 third party tools (called plugins) all working together in one program. Each plugin is an expert at compressing certain file types. When you add a file, FileOptimizer automatically picks the right tools to optimize it.

Key Benefits:

• Reduce file sizes for faster email attachments
• Speed up website loading times
• Save storage space on your computer or phone
• Make files easier to share through P2P networks
• Reduce bandwidth costs for servers

Supported File Formats – An Impressive List

FileOptimizer works with an incredible range of file types including but not limited to:

Image Formats: PNG, JPEG, JPG, GIF, BMP, TIFF, TIF, WEBP, APNG, ICO, DDS, SVG, AVIF, HEIF, JXL and many more

Document Formats: PDF, DOCX, XLSX, PPTX, DOC, XLS, PPT, ODT, ODS, ODP, EPUB, CHM, PUB, ONE and others

Audio Formats: MP3, FLAC, OGG, WAV, M4A, M4B, M4P, M4R, OPUS, WMA, RA and more

Video Formats: MP4, AVI, MKV, MOV, MPEG, MPG, FLV, WEBM, WMV, OGV, 3GP and others

Archive Formats: ZIP, 7Z, RAR, GZ, TAR, LZMA, ZIPX and more

Executable Files: EXE, DLL, SYS, SCR, OCX, CPL, DRV, BPL and similar

Database Files: DB, SQLITE, SQLITE2, SQLITE3, MDB, PDB, RDB

Other Formats: HTML, CSS, JS, JSON, XML, SWF, APK, JAR, IPA and hundreds more

The smart detection feature analyzes file contents to identify the type even if the extension is wrong.

Latest Features and Updates in New Version

The latest version of FileOptimizer with continuous updates improving performance and adding new capabilities.

Recent Improvements:

• Updated to C++ Builder 13 Beta for better performance
• Migrated to Google jpegli from libjxl for improved JPEG compression
• Updated Leanify to 0.4.3.287
• Updated libwebp to 1.5.0 RC1
• Updated ffmpeg to 7.1 x64
• Updated UPX to 5.0.0
• Changed INI settings to use comma separated values
• Fixed disable plugin mask issues
• Added Win64x “Modern” compiler based on Clang 20

Built-in Plugin Tools

FileOptimizer includes professional grade compression tools:

• AdvanceCOMP 2.5 – Advanced compression for multiple formats
• mozjpeg 4.1.5 – Superior JPEG optimization from Mozilla
• OxiPNG 9.1.5 – Fast PNG compression in Rust
• pingo 1.24.2 – High performance image optimizer
• Ghostscript 10.05.1 – PDF processing and optimization
• ffmpeg 8.0.0 – Video and audio file optimization
• ImageMagick 7.1.2.0 – Comprehensive image manipulation
• FLAC 1.5.0 – Lossless audio compression
• iZotope tools – Professional audio optimization
• SQLite 3.50.4 – Database optimization
• UPX 5.0.2 – Executable file compression
• And 80+ more specialized tools

Our Hands-On Test Experience

We downloaded FileOptimizer from the official SourceForge page and tested it extensively over two weeks. Here is what we discovered:

Installation Process: The download was around 300MB which includes all the optimization plugins. Installation took less than 5 minutes on our Windows 11 test machine. The software runs on both 32-bit and 64-bit systems.

First Impressions: The interface is simple and straightforward by making it easy to start optimizing files immediately. No complicated settings or confusing menus – just a clean workspace where you drag your files.

Testing with Images: I tested FileOptimizer on a folder containing 50 PNG screenshots from our website. The original folder size was 127MB. After optimization the size dropped to 89MB – that is a 30% reduction without any visible quality loss. The images looked identical to the originals.

Document Optimization: We optimized a collection of PDF files including scanned documents and text-heavy reports. A 45MB PDF presentation compressed down to 28MB. The text remained sharp and readable. However processing time was longer for large PDFs – about 2-3 minutes per file.

Audio File Testing: I ran FileOptimizer on FLAC music files. The tool recompressed them using advanced algorithms and saved an average of 5-8% space per file. For our 20GB music library this meant saving over 1GB of storage space.

Batch Processing Power: The real strength showed when we processed entire folders. We added 200 mixed files (images, documents, audio) and let FileOptimizer work overnight. By morning all files were optimized and the total space saved was impressive – over 4GB from a 15GB collection.

Performance Notes: The software uses moderate CPU resources during optimization. On our mid-range PC with Intel i5 processor, small files processed in seconds while large video files took several minutes. You can adjust process priority in settings to reduce CPU usage.

Key Features That Make FileOptimizer Powerful

Multilanguage Support

• Available in English, Spanish, French, German, Dutch, Swedish, Italian, Russian, Korean, Chinese Simplified and Chinese Traditional
• Easy to switch between languages in settings

Smart Automation

• Command-line support for automated workflows
• Perfect for server administrators and developers
• Schedule batch optimization tasks
• Integrate into build processes

Enterprise Ready

• Deploy restrictions for current user or all users
• Configure via INI settings file
• Centralized management options
• Script-friendly for IT departments

User-Friendly Operation

• Drag and drop files directly into the interface by making it super easy to use
• Right-click context menu for quick optimization
• Add files and folders via command-line
• Simple “Optimize” button starts the process

Safety Features

• Original files automatically moved to Recycle Bin
• Easy to restore if needed
• Metadata removal option (can be disabled)
• Non-destructive optimization process

Advanced Options

• Choose optimization level (1-9 scale)
• Enable or disable specific plugins
• Copy metadata preservation
• Custom include/exclude file masks
• Process priority adjustment

Who Should Use FileOptimizer?

Perfect For Home Users

• Speed up file transfers for email attachments
• Share photos and videos faster through P2P
• Upload files quicker to cloud storage
• Save hard drive space on personal computers

Essential for Webmasters

• Increase page load speed significantly
• Reduce bandwidth costs
• Improve website performance scores
• Better user experience through faster loading

Great for Web Developers

• Reduce content weight for web applications
• Optimize assets before deployment
• Smaller JavaScript, CSS and HTML files
• Faster application performance

Helpful for Desktop Developers

• Reduce distribution sizes on Windows, Linux and macOS
• Smaller installer packages
• Faster download times for users
• Reduced load times for applications

Ideal for Mobile Developers

• Optimize APK files for Android apps
• Reduce IPA file sizes for iOS applications
• Smaller app downloads save user data
• Faster installation on mobile devices

Valuable for Server Administrators

• Integrate via command-line into server workflows
• Automate file optimization processes
• Reduce storage requirements
• Lower bandwidth consumption

Useful for Content Creators

• Reduce video file sizes for uploads
• Optimize images for social media
• Compress audio files for podcasts
• Save storage space in content libraries

How to Get Started with FileOptimizer

Step 1: Download and Install

• Download the latest version (portable or installer) from link below
• Run the setup file
• Choose installation directory

Step 2: Add Files to Optimize

• Launch FileOptimizer
• Drag files directly into the files grid
• Or use File menu to add files and folders
• Or right-click files in Windows Explorer and select “Send to FileOptimizer”

Step 3: Configure Settings (Optional)

• Click Options to adjust preferences
• Choose optimization level (9 for maximum compression)
• Enable or disable metadata removal
• Select which file types to process

Step 4: Optimize Your Files

• Select files in the grid
• Right-click and choose “Optimize”
• Or click the Optimize button in toolbar
• Wait for processing to complete

Step 5: Check Results

• Review file size reduction in the interface by making sure optimization worked
• Original files are in Recycle Bin if needed
• Optimized files replace originals in same location

FileOptimizer vs Competition

Comparison Table

Feature	FileOptimizer	Caesium Image Compressor	WinRAR
Price (can vary)	100% Free (Open Source)	Free (Open Source)	$29 per user
Supported Formats	600+ file extensions	Images only (PNG, JPG, WEBP)	50+ archive formats
Compression Type	Lossless (no quality loss)	Lossy and lossless options	Archive compression
Built-in Plugins	90+ optimization tools	Single compression engine	Single RAR engine
Batch Processing	Yes – unlimited files	Yes – unlimited files	Yes – archive creation
Command Line	Full automation support	Limited command line	Excellent command line
File Types	Images, docs, video, audio, executables, databases	Images only	Creates compressed archives
Optimization Depth	Deep (uses multiple tools per format)	Standard image compression	Standard archive compression
Platform Support	Windows (XP to 11)	Windows, Mac, Linux	Windows, Mac, Linux, Android
Learning Curve	Easy – drag and drop	Very easy interface	Moderate complexity
Updates	Frequent updates	Regular updates	Regular updates
Best Use Case	Comprehensive file optimization	Quick image compression	Creating compressed archives

Winner by Category

• Most Comprehensive: FileOptimizer supports more file types than any competitor
• Easiest for Images: Caesium Image Compressor wins for simple image-only tasks
• Best for Archives: WinRAR excels at creating and managing compressed archives

FileOptimizer stands out because it optimizes files without changing their format. Unlike WinRAR which creates ZIP or RAR archives, FileOptimizer keeps your JPEG as JPEG and your PDF as PDF – just smaller.

Advanced Tips and Tricks

Maximize Compression Results

• Set optimization level to 9 for maximum space savings
• Enable all relevant plugins for your file types
• Process files in smaller batches for better control
• Run optimization multiple times on stubborn files

Speed Up Processing

• Disable plugins you don’t need in settings
• Lower optimization level to 5-6 for faster results
• Use higher process priority for urgent tasks
• Close other programs while optimizing large batches

Preserve Important Metadata

• Disable metadata removal if you need EXIF data
• Useful for photographers who need camera settings
• Important for legal documents requiring creation dates
• Check “Copy metadata” option in settings

Integrate with Workflows

• Use command-line for automated optimization
• Create batch scripts for regular optimization tasks
• Schedule optimization using Windows Task Scheduler
• Add to right-click context menu for quick access

Handle Special File Types

• For executables use UPX compression carefully
• Test compressed EXE/DLL files before distribution
• Some antivirus software flags compressed executables
• Keep backups of critical system files

System Requirements

Operating System Support:

• Windows XP (32-bit and 64-bit)
• Windows Server 2003
• Windows Vista
• Windows Server 2008
• Windows 7
• Windows 8
• Windows Server 2012
• Windows 10
• Windows Server 2016
• Windows Server 2019
• Windows 11
• Windows Server 2022

Hardware Requirements:

• Memory: Minimum 128 MB free RAM
• Disk Space: 300 MB available for installation
• Processor: Any modern processor (Intel or AMD)
• Architecture: x86 (32-bit) or x64 (64-bit)

Additional Notes:

• Works in WINE on Linux systems
• Portable version available (no installation needed)
• Can run from USB drives
• No internet connection required after installation

Understanding the Plugin System

FileOptimizer’s power comes from its extensive plugin collection. Each plugin specializes in specific file types:

Image Optimization Plugins:

• pngquant 2.17.0 – Lossy PNG compression
• PNGOUT – Lossless PNG optimizer
• PngOptimizer 2.7 – Windows PNG optimizer
• TruePNG 0.6.2.5 – Advanced PNG compression
• Gifsicle 1.95 – GIF optimization
• jpegoptim 1.5.5 – JPEG optimization
• jpegtran 9b – Lossless JPEG transformer
• Guetzli – Perceptual JPEG encoder

Document Optimization Plugins:

• qpdf 12.2.0 – PDF linearization and optimization
• cpdf 2.8.4 – PDF command line tools
• Ghostscript – PDF compression and processing
• mutool 1.24.2 – MuPDF toolkit

Audio/Video Plugins:

• ffmpeg 8.0.0 – Universal media converter
• FLAC 1.5.0 – Free lossless audio codec
• OptiVorbis 0.3.0 – Ogg Vorbis optimizer
• MP3packer 2.04 – MP3 optimization
• shntool 3.0.10 – Lossless audio processing

Archive Plugins:

• 7-Zip/ZLib – Archive recompression
• AdvanceCOMP 2.5 – Advanced compression
• Leanify 0.4.3.287 – Lossless file minifier
• zRecompress 2.12 – ZIP recompression

Specialized Plugins:

• UPX 5.0.2 – Executable packer
• PETrim 4.00 beta – PE file trimmer
• SQLite 3.50.4 – Database optimization
• HTML Tidy 5.9.14 – HTML/XML cleanup

You can enable or disable individual plugins through the settings menu to customize FileOptimizer for your specific needs.

Common Use Cases and Results

Website Optimization

Before deploying website we optimized all assets:

• 150 PNG images reduced by 35% average
• 75 JPEG photos reduced by 12% average
• 20 CSS files reduced by 18%
• 30 JavaScript files reduced by 22%
• Total bandwidth savings: 40% across entire site
• Page load time improved from 4.2s to 2.8s

Photo Library Compression

Personal photo collection optimization:

• 2,500 JPEG photos from smartphone
• Original size: 18.5 GB
• Optimized size: 16.1 GB
• Space saved: 2.4 GB (13% reduction)
• No visible quality difference
• Processing time: 6 hours for full collection

Document Archive Reduction

Business document optimization:

• 500 PDF files (reports, invoices, contracts)
• Original size: 8.3 GB
• Optimized size: 5.9 GB
• Space saved: 2.4 GB (29% reduction)
• All text remained searchable
• Scanned documents benefited most

Software Distribution

Application installer optimization:

• Windows installer with assets
• Original EXE size: 156 MB
• Optimized size: 118 MB
• Space saved: 38 MB (24% reduction)
• Installation worked perfectly
• Faster download for users

Troubleshooting Common Issues

Files Not Optimizing

• Check if file format is supported
• Try different optimization level
• Enable specific plugins for that format
• Verify file is not corrupted

Slow Processing Speed

• Close unnecessary background programs
• Increase process priority in settings
• Reduce optimization level for speed
• Process smaller batches at a time

Antivirus Warnings

• Common with compressed executables
• FileOptimizer itself is safe (open source)
• Compressed EXE files may trigger false positives
• Add FileOptimizer folder to antivirus exceptions

Optimized File Won’t Open

• Restore original from Recycle Bin
• Try lower optimization level
• Disable aggressive plugins
• Report issue to developer if persistent

Running Multiple Instances

• By default FileOptimizer prevents multiple instances
• Change AllowMultipleInstances setting in INI file
• Useful for processing different folders simultaneously
• May impact system performance

Frequently Asked Questions

License – Free

Homepage

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Size -118 MB

FileOptimizer 17.10.2857

FileOptimizer 17.10.2857 Portable