PDF ToolsFree

Compress PDF

Reduce PDF file size by stripping metadata, optimizing content streams, and compressing internal resources — all free and entirely in your browser. Perfect for email attachments, web uploads, and saving storage. No quality loss on text; image resolution may reduce slightly at high compression.

Frequently Asked Questions

How much can PDF compression reduce file size?▼
Typically 20–80% depending on content type. PDFs with many high-resolution images see the most reduction, while text-heavy PDFs see more modest savings.
Will compressing a PDF damage the text or images?▼
Text and vector graphics remain crisp and are not affected. Image resolution may be slightly reduced at higher compression levels, but documents remain fully readable.
Are my PDFs uploaded to a server during compression?▼
No. Everything happens locally in your browser using the PDF-lib library. Your files never leave your device.
Can I compress a scanned PDF?▼
Yes. Scanned PDFs (which are image-heavy) often see the largest file size reductions from compression.