How to Compress Video for Email (Gmail, Outlook, Yahoo)
Email Attachment Limits
Gmail limits attachments to 25 MB. Outlook.com allows 20 MB. Yahoo Mail permits 25 MB. Corporate email servers are often even stricter — 10 MB or less. A single minute of iPhone 4K video is about 350 MB, making email attachment completely impractical without compression.
Compress to Fit
Use CocoConvert's video compressor: upload your video, set a target file size (20 MB for Gmail, 15 MB to be safe), and convert. The compressor will automatically adjust resolution and bitrate to meet your target while maximizing quality. For a 2-minute clip, expect 720p at medium quality — perfectly watchable on a phone or laptop screen.
When Compression Isn't Enough
For longer videos, compression alone won't get you under the limit without visible quality loss. Better alternatives: upload to Google Drive, OneDrive, or Dropbox and share the link in your email. Gmail even prompts you to do this automatically when you try to attach a large file. The recipient gets the full-quality video without any size constraints.
Format Matters
Always send video email attachments as MP4 with H.264. It's the most universally playable format — the recipient can preview it in their browser, phone, or any media player. Avoid MKV, AVI, or MOV for email — these may not play on the recipient's device without additional software.