How much can a PDF be compressed?

Image-heavy PDFs can shrink 40-80%. Text-only PDFs compress less. The tool shows before and after file sizes.

Does compression reduce quality?

Slight image quality reduction may occur. For text documents quality is not affected.

Yes. All compression runs in your browser using PDF-lib. Files are never uploaded to a server.

Password-protected PDFs must be unlocked first using the Unlock PDF tool, then compressed.

← すべてのツール / Compress PDF

Reduce the size of your PDF files while maintaining the best possible visual quality. 100% secure, processed inside your browser.

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またはクリックして参照します

Upload or drop your PDF document into the zone above.
Choose your preferred compression tier.
Click Compress & Download PDF — the utility reconstructs the document to strip metadata, optimize PDF structures, and reduce overall size instantly in your browser.
Your document is 100% private and processed offline in client memory.