You hit send and the email bounces with 'attachment too large'. Most providers cap at 20-25 MB. Scanned PDFs and image-heavy reports blow past that easily. Three approaches usually work.
Compress first
Compress PDF is the easiest fix. Default settings typically shrink a 50 MB scan to 5 MB with no visible quality loss. Choose 'screen quality' for email-bound files; the recipient won't notice the difference on a screen. Text PDFs compress less aggressively because the floor is already low — but image-heavy reports often shed 90%.
Split it up
Some PDFs (200-page legal bundles, multi-chapter reports) genuinely need to be that big. Split PDF breaks one file into several — first 100 pages and last 100 pages, or chapter by chapter. Send two emails or zip the parts. The recipient can merge them back if needed, or just read each part. Most readers are fine with multi-part PDFs as long as you label them clearly (Part 1, Part 2).
Share a link instead
Cloud-based sharing (Google Drive, Dropbox, OneDrive, WeTransfer) bypasses email limits entirely. Upload, generate a link, paste into the email. Some services impose access controls — recipient needs an account to view — others let anyone with the link in. For confidential files, also password-protect the PDF itself; cloud-share + password is belt and braces.
FAQ
What's the typical email size limit?
Gmail and Outlook cap at 25 MB. Corporate email gateways often cut lower (10 MB). Always assume the strictest limit and target 5 MB max for routine sends — you'll never run into trouble.
Does compressing reduce quality visibly?
Default settings target invisible-to-the-eye loss. For email use, you can be aggressive. For print masters, keep originals; only compress copies for sending.
Should I zip the PDF before sending?
PDFs are already compressed internally — zipping rarely shrinks them further. Stick to compress-or-split-or-share-link rather than zipping.
Big PDFs are almost always shrinkable. Run yours through compress and try sending again.