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    Compress PDF

    Reduce the file size of your PDF, e.g. for email attachments or online forms.

    or drop them here Your files never leave your device

    How it works

    1. Select your PDF file.
    2. Choose a compression level.
    3. Click “Compress PDF” and download the smaller file.

    Frequently asked questions

    How much smaller will my PDF get?

    That depends on the content. Scanned documents and PDFs with photos often shrink by 50–90%, text-only PDFs hardly at all.

    What does “strong compression” do?

    Every page is saved again as an optimized image. This saves a lot of space, but the text can no longer be selected or searched.

    Are my files uploaded?

    No. HowDoIPDF runs entirely in your browser. Your files are not sent to any server and stay on your device – ideal for confidential documents too.

    Is “Compress PDF” free?

    Yes, completely free – no sign-up, no watermark and no file size limit.

    Does it work on my phone?

    Yes. The tool works in any modern browser on iPhone, iPad, Android, Windows, Mac and Linux – no app needed.

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