Compress PDF

Compress PDF

Try browser-safe PDF optimization. No uploads, no hidden quality changes.

Drop PDF files here

or choose files

Your files never leave your device.

No upload proof

This tool runs locally in your browser using JavaScript or WebAssembly. PDF Plain does not receive your PDF content.

You can verify this yourself: open your browser's Network tab while using the tool and watch - no PDF file is sent.

Compression note: this browser-safe optimizer rewrites PDF structure. It does not shrink images or fonts aggressively, so image-heavy or already optimized files may only get a small size reduction.

    How it works

    1. Add PDFs

    Select one or more PDF files.

    2. Optimize safely

    The browser rewrites the PDF using object streams where possible.

    3. Compare results

    The output shows before and after file sizes.

    FAQ

    How much smaller will it be?

    It depends on the PDF. Some files shrink; already optimized files may not.

    Will quality go down?

    This browser-safe optimizer does not rasterize pages or intentionally reduce image resolution.

    Why did it barely change?

    The PDF may already be optimized or mostly text.

    Are files uploaded?

    No. Files are processed locally in your browser.