PDF Compressor
Reduce PDF file size while maintaining quality. Compress PDFs online for free with our advanced compression algorithms.
Upgrade to Pro Version
Get unlimited compression, batch processing, and priority support
Upload Your PDF File
Drag and drop your PDF file here or click to browse. Max file size: 100MB
Supports all PDF files • Secure client-side processing
document.pdf
Compressing Your PDF
Processing your document with advanced compression algorithms
Compression Successful!
Your PDF has been optimized and ready to download
Original PDF
Compressed PDF
File will be deleted from browser memory when you close this page
Complete PDF Toolkit
Edit, merge, split, convert, and protect PDFs with our professional suite
100% Client-Side Processing
Your PDF files never leave your computer. All compression happens locally in your browser using PDF.js and PDF-Lib libraries.
Real Compression Algorithms
Uses actual PDF optimization techniques: image compression, font subsetting, and metadata removal for genuine file size reduction.
Smart Quality Preservation
Intelligently balances file size reduction with quality retention using advanced algorithms and adjustable compression settings.
Business PDF Solutions
Enterprise-grade PDF compression with batch processing and API access
Frequently Asked Questions
This is a real working compressor using:
1. PDF.js Library: Parses and analyzes your PDF file structure
2. PDF-Lib Library: Rebuilds the PDF with optimizations
3. Real Compression Techniques:
• Image quality reduction and downsampling
• Font subsetting and optimization
• Metadata and redundant data removal
• Object stream optimization
All processing happens in your browser – no files are uploaded to any server.
Quality depends on compression level:
• Fast Compression: Minimal quality loss, best for text documents
• Recommended: Balanced quality/size, suitable for most documents
• Maximum Compression: Noticeable quality reduction, best for web use
You can adjust image quality and DPI settings to control the quality vs size trade-off.
The compressor uses smart algorithms to preserve text quality while optimizing images.
All essential features are preserved:
• Text content: All text remains fully editable and searchable
• Page layout: Page structure, margins, and positioning
• Hyperlinks: Clickable links remain functional
• Text formatting: Fonts, colors, and styles
• Vector graphics: Logos, shapes, and line art
Note: Some advanced features like embedded 3D content or complex transparency effects may be simplified.
Technical limitations:
• File size: Up to 100MB per file (browser memory limit)
• Pages: No strict limit, but very large documents may be slower
• Processing time: Depends on file complexity and browser performance
• Browser support: Works in all modern browsers (Chrome, Firefox, Safari, Edge)
For very large files or batch processing, consider our desktop or pro versions.