Reduce your PDF file size instantly in your browser — completely private, no server upload, 100% free.
Supports all PDF files · Compression happens in your browser
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Compression happens in your browser — files never leave your device
Significant size reduction without visible quality loss
No upload wait — works immediately after page load
No registration, no limits, no hidden fees ever
Upload your PDF above, choose your compression level (Low, Medium, or High), then click "Compress PDF". Download your smaller PDF instantly — completely free.
Depending on the PDF content and compression level chosen, you can reduce file size by 20% to 75%. PDFs with many images compress the most.
Low and Medium compression preserve excellent visual quality. High compression achieves maximum size reduction with minimal quality difference for most documents.
Medium is the best choice for most use cases — great size reduction with excellent quality. Use Low for critical image quality. Use High when file size is the top priority.
PDFs that are already optimized, text-only, or digitally generated compress less. Browser-based compression works best on image-heavy or unoptimized PDFs.
No. Compression happens entirely in your browser using pdf-lib. Your files never leave your device — your privacy is always protected.