Short answer
Email clients and many portals cap attachments (often ~10–25 MB, sometimes far less). Drop your PDF below, use Keep text for everyday mail, or Target size when a form asks for 100 KB–2 MB. Compression runs in your browser — the file is never uploaded.
Compress PDF for email attachment
Free · private · files stay on your device
How it works
- 1
Drop the PDF into the compressor below.
- 2
Use Keep text for everyday email; use Target size when a recipient or form states a KB/MB cap.
- 3
Preview the first pages so charts and small print stay readable.
- 4
Download and attach the result in your email client.
- 5
Optional: Remove metadata or run the privacy checker before sending sensitive mail.
Who needs this
- Anyone whose PDF is “too large to email”
- People sending to Gmail, Outlook, or corporate gateways with attachment caps
- Applicants attaching forms under portal size rules
Files never leave your device
Compression is local. mypdf.space never receives your attachment. Your email provider handles the send after you download.
Limits worth knowing
- Target size stops at a readable floor instead of producing unreadable pages.
- Very image-heavy decks may need Max shrink or a dedicated size page.
- Password-protected files must be unlocked first.
Frequently asked questions
What size should a PDF be for email?
Under 10 MB is safe for most Gmail and Outlook sends. Many government and university portals ask for 1–2 MB or less — use Target size or a size page like 1 MB / 500 KB.How is this different from Compress PDF online?
Same compressor, different intent. This page focuses on attachment limits and email workflows; Compress PDF online covers general compression and Keep text vs Max shrink.Can I compress for WhatsApp or portals too?
Yes. Use Target size here, or open Compress to 100 KB / 200 KB for stricter caps. Files stay on your device either way.
Written by Sumit · Last updated 23 Oct 2026