Compress PDF
Reduce PDF file size while preserving quality. No upload required.
How to compress a PDF
- Upload your PDF by clicking or dragging
- Select your preferred compression level
- Click "Compress PDF" to reduce file size
- Download the compressed PDF
Why use our PDF compressor?
Compress PDFs for email, archiving, or uploading. All processing happens locally in your browser — no server uploads. Adjust quality to balance file size and visual fidelity.
Related Tools
Why Compress a PDF?
Reducing PDF file size is essential for email attachments (many servers cap at 10-25 MB), uploading to document management systems, archiving storage, and faster sharing. Image-heavy PDFs like scanned documents, presentations with embedded photos, and marketing brochures benefit the most from compression.
Our compressor offers three quality levels: Low for maximum visual fidelity, Medium for balanced compression, and High for the smallest file size. Typical compression ratios range from 20% to 60%.
Compression Tips
The tool compresses by removing redundant objects and optionally scaling down oversized images. For text-heavy PDFs (reports, invoices, legal documents), choose "Low" — the size reduction is still significant with no visible quality loss. For image-heavy documents, "Medium" or "High" settings provide much smaller files with acceptable quality.
All compression happens entirely in your browser using pdf-lib. No files are uploaded — your confidential documents stay on your device.
Technical Specifications
- Input format: PDF (.pdf)
- Output format: Compressed PDF (.pdf)
- Compression levels: Low, medium, and high options to balance size vs. quality
- File limit: Up to 50 MB per file
- Processing: 100% client-side in your browser, nothing is uploaded