PDF

Compress PDF for Email — Attachment Size Guide

Fit PDFs under Gmail, Outlook, and portal limits. Compression levels, split fallback, and size checker tool.

Published June 1, 2025 · 1 min read

Written by Ethan Brooks · Editor-in-Chief & Product Lead

Reviewed by James Cole

Last reviewed January 15, 2026 · Editorial policy

Try it free — no signup

3 uses per day · 200 MB · TLS encrypted · auto-delete

Use free tool →

Email attachment limits in 2026

Gmail and Outlook typically cap attachments at 25 MB; many corporate gateways cut lower. Government and job portals often enforce 2–10 MB. Our full reference table lists official limits.

Step-by-step: fit your PDF in email

Check file size — aim under 20 MB for safety margin.
Run Compress PDF on medium; switch to high only if still over limit.
If compression blurs fine print, split into Part 1 / Part 2 instead.
Use Will My PDF Fit? to pick Gmail vs portal targets.

Long-tail landing pages

Sources & references

Primary references used when researching and fact-checking this guide. See our editorial methodology.

Adobe PDF Reference — encryption — Adobe
PDF password protection and encryption standards (ISO 32000).
Ghostscript documentation — PDF settings — Artifex Software
Compression level behavior and PDF output settings.