Compress PDF free — no upload
Reduce PDF file size by 40-80% directly in your browser. Your document never leaves your device — 100% private, secure, and instant.
Drop files or click to choose
100% local private compression. Files never leave your device.
Why compress PDFs with MiniFiles?
100% private
Your PDF never leaves your device. No server upload, no data retention.
Instant results
Compress in seconds without waiting for uploads or server queues.
Password protection included
After compression, add AES-256 password protection — also locally.
No quality loss
Lossless text compression + smart image optimization. Visual quality preserved.
Compare with other tools
How PDF compression works
1. Upload your PDF
Drag and drop or select your PDF. The file stays on your device.
2. Compress locally
WebAssembly algorithms reduce file size by recompressing images and optimizing structure.
3. Download instantly
Your compressed PDF is ready immediately. Nothing is stored or transmitted.
Frequently asked questions
Does MiniFiles upload my PDF to a server?
No. All PDF compression happens locally inside your browser using WebAssembly. Your file is never transmitted to any external server.
How much can I compress a PDF?
Typical reductions range from 40% to 80% depending on the PDF content. Image-heavy PDFs compress the most.
Is there a file size limit?
No. MiniFiles sets no file size limit on any plan — very large PDFs are limited only by your browser's memory. Without an account you can compress 10 files a day; a free account removes the daily limit.
Can I password-protect a PDF after compressing it?
Yes. MiniFiles supports local PDF password protection with AES-256 encryption. Your PDF never leaves your device.
Will compression reduce the quality of my PDF?
MiniFiles uses lossless compression for text and vector content, and intelligent image recompression for photos. Visual quality is preserved while file size drops.
Need more features?
Upgrade to Pro for unlimited batch compression, advanced PDF protection, and priority support.
See Pro plans