How do I reduce a PDF file size for free?

Upload your PDF to OneKit's free PDF Compressor. The tool re-renders each page at a lower quality level and rebuilds the PDF, significantly reducing the file size. Everything runs in your browser - no upload to servers needed.

Will compressing a PDF lose quality?

Some quality reduction is expected when compressing PDFs, but OneKit's PDF Compressor is optimized to minimize visible quality loss while achieving significant file size savings. You can adjust the compression level to find the best balance.

Is the PDF compressor free and safe?

Yes, it is completely free and safe. Your PDF is processed locally in your browser and never uploaded to any server, ensuring full privacy.

📋 PDF Compressor

Reduce your PDF file size. Select a compression level and download - no file ever leaves your device.

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Click to upload or drag & drop a PDF file

PDF files only • Max 100 MB

💡 PDF Compression Tips

PDFs with many images compress the most - up to 80% reduction.
Text-only PDFs will see minimal compression since text is already compact.
Use Light mode for important documents where quality matters (legal, medical).
Use Heavy mode for drafts, references, or when email attachment size is the issue.
All processing is done entirely in your browser - your PDF stays private.