Compress PDF Online
Reduce your PDF file size by up to 80% instantly. Free, private, no upload required — everything runs in your browser.
or drop files here
PDF files only — multiple files allowed
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Frequently Asked Questions
How do I compress a PDF file?
Upload your PDF, choose a quality preset (Screen, eBook, or Printer), and click Compress. Your compressed PDF downloads automatically. No account needed.
Is it safe to compress PDF online?
Yes. FreeAIKit processes everything in your browser. Your PDF files never leave your device — no server upload, no data collection.
How much can I compress a PDF?
Image-heavy PDFs (presentations, scans) typically shrink 50-80%. Text-heavy PDFs see 10-30% reduction. Results depend on content type.
Will compressing a PDF reduce quality?
Screen mode prioritizes small size, eBook balances size and quality, Printer keeps high fidelity. Choose based on your needs.