Compress PDF
Reduce your PDF file size while optimizing for quality. 100% free, runs in your browser. Your files never leave your device.
How to Compress a PDF Online
Upload your PDF file by dragging and dropping it or clicking the upload area.
Choose your compression level: Light for best quality, Medium for balanced results, or Strong for maximum reduction.
Click "Compress & Download PDF" to process and download your compressed file instantly.
If the file size increased, try a different file. Text-heavy PDFs are already compact.
Why Use Our Free PDF Compressor?
100% Client-Side Processing
Your PDF files are processed entirely in your browser. Nothing is uploaded to any server, ensuring complete privacy and security.
Adjustable Compression Levels
Choose between Light, Medium, and Strong compression to find the perfect balance between quality and file size for your needs.
No Registration Required
Start compressing PDFs immediately. No account creation, no email verification, no hidden fees. Just upload and compress.
Works on Any Device
Our PDF compressor works on desktop, tablet, and mobile browsers. No software installation needed.
Frequently Asked Questions
Is it safe to compress PDFs online?
Yes. Our tool processes your PDF entirely in your browser using JavaScript. Your files are never uploaded to any server, so your documents remain completely private.
Will compression affect the quality of my PDF?
It depends on the compression level. Light compression preserves high quality with moderate size reduction. Strong compression achieves maximum reduction but may reduce image sharpness. Text-heavy PDFs compress with minimal visible quality loss.
Why did the compressed file get larger?
This happens with text-heavy PDFs that are already well-optimized. Our compression converts pages to images, which can be larger than compact text. For these files, the original is already at a good size.
Is there a file size limit?
There is no strict file size limit, but very large PDFs (over 200MB) may be slow to process depending on your device. For best performance, we recommend files under 100MB.
Can I compress a password-protected PDF?
Password-protected PDFs need to be unlocked before compression. Please remove the password protection first, then upload the unlocked file.