PDF Compressor
Fast, secure, and free PDF compression tool. Process files locally without uploading to servers.
Secure & Private
Process files locally without uploading
Lightning Fast
Compress PDFs in seconds
Quality Preserved
Maintain document quality
Compress PDF
Upload Your PDF
Drag and drop your PDF file here, or click the button below to browse your files
Supports PDF files, maximum 500MB
All files are processed locally in your browser for maximum privacy protection
Ready to Track Your Compressions?
Start compressing PDFs to see your compression history here. Track file sizes, compression ratios, and easily redownload files.
How Our PDF Compressor Works
Advanced Compression
Our tool uses advanced algorithms to reduce PDF file size while maintaining document quality and readability.
Secure Processing
All files are processed securely in your browser. Your documents never leave your device, ensuring complete privacy.
Multiple Formats
Support for various PDF types including text documents, images, and mixed content with optimal compression for each.
Fast Processing
Quick compression process that delivers results in seconds, perfect for both small documents and large files.
Why Choose Our PDF Compressor?
Free to Use: No registration required, completely free PDF compression service available 24/7.
Privacy First: Client-side processing ensures your documents remain private and secure.
High Quality: Maintains document readability while achieving optimal file size reduction.
Cross-Platform: Works on all devices and browsers without additional software installation.
Complete PDF Compression Guide
📚 Document Types
Text-Heavy PDFs: Contracts, reports, books - achieve 60-80% compression
Image-Rich PDFs: Brochures, portfolios - achieve 40-60% compression
Mixed Content: Presentations, magazines - achieve 50-70% compression
Scanned Documents: OCR documents - achieve 30-50% compression
⚙️ Compression Levels
Low (10-30%): Minimal compression, highest quality, best for professional documents
Medium (30-60%): Balanced compression, good quality, ideal for general use
High (60-80%): Maximum compression, reduced quality, perfect for email attachments
💡 Best Practices
Before Compression: Remove unnecessary pages and content
File Size Targeting: Email limit is usually 25MB, consider your needs
Quality Check: Always review the compressed file before sharing
Backup Original: Keep the original file for future reference
Technical Specifications & Compatibility
🌐 Browser Support
✅ Chrome 90+
✅ Firefox 88+
✅ Safari 14+
✅ Edge 90+
✅ Mobile browsers (iOS Safari, Chrome Mobile)
📄 PDF Standards
✅ PDF 1.3 to 1.7
✅ PDF/A (archival)
✅ Encrypted PDFs (password required)
✅ Form-enabled PDFs
✅ Multi-page documents
🔧 Technology Stack
📚 PDF-lib.js for processing
⚡ Web Workers for performance
🔒 Client-side only (no server)
💾 Local storage for history
🎨 Progressive Web App ready
Frequently Asked Questions
Q: Is my PDF file safe and secure?
Yes, absolutely. Your PDF files are processed entirely in your browser using JavaScript. No files are uploaded to our servers or any third-party services. Your documents never leave your device, ensuring complete privacy and security.
Q: What's the maximum file size I can compress?
Our tool supports PDF files up to 500MB. However, larger files may take longer to process and require more memory. For optimal performance, we recommend files under 100MB. Very large files might cause browser memory issues on older devices.
Q: Will compression affect PDF quality?
Our compression algorithm is designed to maintain visual quality while reducing file size. Text remains crisp and readable. Images may show slight quality reduction at higher compression levels, but this is usually not noticeable for most use cases. You can always choose a lower compression level if quality is critical.
Q: Can I compress password-protected PDFs?
Currently, our tool cannot process password-protected or encrypted PDF files. You'll need to remove the password protection first using the original application or a PDF editor, then compress the unlocked file. This is a security measure to ensure we cannot access protected content.
Q: Why is my compressed file sometimes larger?
In rare cases, if your PDF is already highly optimized or contains mostly compressed content, our processing might result in a slightly larger file. This happens because we add compression metadata. If this occurs, simply use your original file instead.
Common Use Cases & Examples
💼 Business & Professional
Email Attachments: Reduce 50MB reports to under 10MB for email delivery
Document Archiving: Save storage space for long-term document retention
Web Publishing: Optimize PDFs for faster website loading times
🎓 Education & Personal
Student Projects: Compress thesis and research papers for submission
Digital Portfolios: Reduce portfolio size while maintaining visual quality
E-book Creation: Optimize personal document collections for e-readers
Performance Statistics & Comparison
Benchmark: Tested with over 10,000 PDF files ranging from 1MB to 500MB across various document types. Results may vary based on file content, browser performance, and device capabilities.
Additional Resources & Tips
🚀 Performance Tips
- • Close other browser tabs for better performance
- • Use latest browser versions for optimal speed
- • Clear browser cache if experiencing issues
- • Process files during low-activity periods
- • Ensure sufficient device memory (4GB+ recommended)
🔍 Troubleshooting
- • File won't upload: Check file format and size limits
- • Slow processing: Try smaller files or lower compression
- • Browser freezes: Refresh page and try smaller batch sizes
- • Download issues: Check browser download settings
- • Quality concerns: Use lower compression levels