Guide
The email bounced because the video was too big
Updated 2026-08-28 · 6 min read
Schools, law offices, and HR portals still want a real attachment. “Just put it on Drive” is not always allowed. Gmail’s cap is 25 MB. Many Outlook servers sit at 20 MB. Here is how to hit those numbers on purpose.
The numbers that matter
Gmail: 25 MB per message, including the other attachments and a little MIME overhead. If you attach a 24.9 MB video and a PDF, you can still bounce. Aim for ~23 MB of video if the message has other files.
Outlook.com and many Microsoft 365 tenants: 20 MB is a common default; some admins set 10 MB or 35 MB. If you do not know, 20 MB is the safe public guess. Job portals and “upload your intro video” forms are often 8–10 MB. Use a custom target for those.
Why “send as Drive link” is not a fix
Recipients behind strict firewalls cannot open Drive. Some application systems only accept the files in the form. Some people will not click a link from someone they just met. An MP4 that is actually 20 MB still wins in 2026.
Cloud links are the right tool for archives and 2 GB interviews. They are the wrong tool for “please find my 90-second sample attached.”
How to attach a clip that arrives
Compress to Email (25MB) or Email (20MB) in the browser. Two-pass encoding aims under the cap so scanners and extra headers do not push you over. Download the MP4, attach it, send a test to yourself if the recipient is high-stakes.
If it still bounces, the server is stricter than advertised. Try Custom 18 or 10. Lower resolution if the clip is long. Do not zip the MP4 — zip does not shrink video and some scanners dislike it.
Ready to try it? Compress a video in your browser— nothing is uploaded.