1. Email attachment limits
- Gmail: 25 MB per message (larger files auto-switch to a Google Drive link).
- Outlook.com: 20 MB; Outlook desktop / Exchange: often 10 MB or a limit set by your IT team.
- Yahoo Mail: 25 MB.
- Corporate mail servers: frequently 10 MB or less.
Important: the recipient's limit matters too. If your company allows 25 MB but theirs allows 10 MB, you need to be under 10 MB. When in doubt, aim for under 10 MB and you'll clear almost any inbox.
2. Method 1: Compress the PDF (the fast fix)
Most oversized PDFs are big because of images or scans. Compressing re-encodes those images to slash the file size — usually with no visible difference on screen.
- Open the Compress PDF tool.
- Drop in your PDF (it stays on your device — nothing is uploaded).
- Pick Recommended (or Strong if you need to go smaller).
- Download and check the new size. Done — usually in seconds.
Make your PDF email-readyShrink it below the limit in seconds — free, private, no sign-up.
Compress PDF →3. Method 2: Split it into smaller files
If compression isn't enough — or you only need to send part of the document — split the PDF and send the pieces. A 30 MB report might become three 10 MB emails, or you might only need pages 1–5.
Use the Split PDF tool to extract a page range, or the Remove Pages tool to drop pages you don't need before sending.
4. Method 3: Share a link instead
For genuinely large files, attach nothing — upload to your own cloud storage (Drive, OneDrive, Dropbox) and email the link. Gmail does this automatically for files over 25 MB. This avoids size limits entirely, though it does mean the file lives in the cloud, so use it for non-sensitive documents.
5. How to keep it readable
- Compress to the size you need, then open the result to confirm text is sharp and images are fine.
- For documents the recipient will print, compress gently (Light) to protect resolution.
- Keep your original — compress only the copy you're emailing.
The bottom line
Nine times out of ten, a quick compress gets your PDF under the limit with no visible quality loss. Keep splitting and link-sharing in your back pocket for the truly enormous files — and you'll never see that "attachment too large" error again.
Frequently asked questions
What is the email attachment size limit?
Gmail and Yahoo allow 25 MB, Outlook.com 20 MB, and many corporate servers cap at 10 MB. The smaller limit between you and the recipient is the one that applies.
How do I make a PDF small enough to email?
Compress it (fastest), split it into smaller parts, or share a link. Compression solves most cases in seconds.
Why is my PDF too big to email?
Usually scanned pages or high-resolution photos, which take far more space than text.