Compress PDF
Reduce PDF file size for email, web upload or storage. 100% in your browser via pdf-lib.
- 100% local · no upload
Frequently asked questions
Are my files uploaded?
No. Compression runs entirely in your browser via pdf-lib. The PDF never leaves your device.
How much can it reduce?
Typical 5-30%. Depends on content — PDFs with embedded images compress less; PDFs with metadata-heavy structure compress more.
What's the file size limit?
50MB practical limit. Beyond that, browser memory becomes a bottleneck.
Does it support password-protected PDFs?
No. Encrypted PDFs need to be unlocked first.
Quality after compression?
No quality loss in the current version — we strip metadata and optimize streams. Image re-encoding (deeper compression) coming in v2.