CompressThis

Compress a PDF for email.

Under 25 MB for Gmail, 20 MB for Outlook.

Free tool

Open the tool — drop a PDF, get a smaller one back in seconds.

Compress for email

The problem

Gmail blocks attachments over 25 MB. Outlook's limit is 20 MB. Apple Mail: 20 MB. Yahoo: 25 MB. Large PDF attachments — architecture plans, marketing decks, product manuals, annual reports — routinely exceed these limits. Sending a Drive link instead of an attachment feels unprofessional in many contexts, and recipients often don't have the right Google account to open it. You want to attach the file. You need the file smaller.

The fix

CompressThis's Email-friendly mode targets a ~5 MB output, which gives you a comfortable margin under every major email provider's limit. For architectural drawings or vector-heavy slide decks it uses light image resampling; for scanned documents it's more aggressive. The result is a PDF that attaches like a normal file and opens cleanly in any PDF viewer — no Drive, no WeTransfer, no expired link.

What you get

  • Email-friendly mode (default) targets ~5 MB — well under Gmail's 25 MB and Outlook's 20 MB limits.
  • Works on any PDF: scanned documents, slide decks, architectural drawings, contracts, invoices.
  • Output opens in any PDF viewer without any extra software — just a normal, smaller PDF.
  • No watermark, no account, no expiry. The compressed file is yours to keep.
  • Files processed in memory and never stored — no copy of your contract or report sits on a server.

Questions

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Why is my PDF so large?
Five reasons — and the fix for each.

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Compress for email

Last updated: May 2026

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