Compress PDF
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Drop a PDF below. CrunchBox will strip unnecessary data and rebuild it smaller. All processing happens in your browser.

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    How to Compress a PDF
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    Why compress PDFs?

    Many email services limit attachments to 10-25MB. Large PDFs with embedded images can easily exceed that. Compressing strips unnecessary metadata, optimizes internal structure, and reduces image quality slightly to save space.

    How it works

    1. Drop your PDF file into the box above
    2. CrunchBox rebuilds the PDF with optimized structure using pdf-lib
    3. Download the compressed version

    Privacy

    Your PDF never leaves your computer. Everything runs in your browser using WebAssembly. No servers, no uploads, no tracking.