Compress a PDF for Email

Compress PDF for Email
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Drop a PDF below. CrunchBox shrinks the images inside it until the file fits under 20 MB, which is within the attachment limit of Gmail, Outlook.com, Yahoo Mail, and iCloud Mail.

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    Email attachment limits
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    • Gmail: 25 MB for personal accounts. Over that, Gmail turns the attachment into a Google Drive link
    • Outlook.com: 25 MB
    • Yahoo Mail: 25 MB for all the attachments in one message
    • iCloud Mail: 20 MB per message, or up to 5 GB with Mail Drop turned on

    Checked against each provider's help pages in October 2026. Work and school email often has its own, smaller limit, set by whoever runs it.

    Why 20 MB
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    20 MB is the smallest of the four limits above, so a PDF under it can go to any of them.

    The limit covers the whole message, not each file. If you are attaching other files too, pick a lower limit from the list so they fit together. And if the person you are sending to has a small mailbox limit, 10 MB or 5 MB is the safer choice.

    How it works
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    1. Drop your PDF into the box above
    2. CrunchBox redraws the images inside it as JPGs, starting gentle and going only as far as the limit needs
    3. Download the PDF and attach it to your email

    Text, fonts, and drawings are not touched, so text stays sharp and searchable. If the PDF is already under the limit, the tool says so. If the images cannot get it there, it says that too, and offers the smallest version it made.

    More PDF tools
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    Compress PDF Light, Balanced, or Strong, or any size limit Compress PDF to under 2 MB Fit a 2 MB upload limit Merge PDF Combine multiple PDFs into one file Split PDF Pull out pages, or cut a PDF into separate files Rotate PDF Turn sideways or upside-down pages the right way Extract PDF Images Get every picture in a PDF as its own file JPG to PDF Combine images into a single PDF
    Privacy
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    Your PDF never leaves your device. Loading, compressing, and download all happen in your browser, and nothing is uploaded. That matters most for the documents people usually need to shrink: IDs, contracts, tax forms, medical records.

    This is why we run entirely in-browser: if we can't touch your files, we can't lose them, leak them, or profile them.