How to Compress a Video to Send by Email
Most email providers cap attachments at 25 MB. Here is how to get a video under the limit without it looking terrible.
Email was never designed to carry video, and it shows. Try to attach a clip straight from your phone and you will almost certainly hit an attachment limit. The solution is to compress the video down to a size your email provider accepts, or to recognize when the file is simply too long for email and a shared link is the better tool. This guide covers both.
Know your provider’s attachment limit
| Provider | Attachment limit | Notes |
|---|---|---|
| Gmail | 25 MB | Larger files auto-convert to a Google Drive link |
| Outlook / Microsoft 365 | 20 MB (often 25 MB) | Suggests OneDrive for bigger files |
| Yahoo Mail | 25 MB | Hard limit on standard accounts |
| Apple iCloud Mail | 20 MB | Mail Drop handles larger files via link |
Notice that the recipient’s provider matters too. Even if you can send a 25 MB file, their inbox may reject it. Aiming for under 20 MB keeps you safe across virtually every service.
The compression workflow
- 1Trim the video to just the part you need to send. For email, shorter is almost always better.
- 2Compress with the High Efficiency (H.265) level to cut the size roughly in half with no visible loss.
- 3If it is still over 20 MB, switch to Maximum Savings and consider dropping the resolution to 720p.
- 4Export as MP4, the format every email client and device can preview.
- 5Confirm the final size is under your target before attaching.
How long a video can email realistically hold?
As a rough guide, a well-compressed 720p clip uses about 1 to 1.5 MB per second of footage at H.265. That means a 20 MB budget covers roughly 15 to 20 seconds at good quality, or longer if the footage is simple, like a static screen recording. If your clip is a couple of minutes long, no reasonable compression will fit it into an email while staying watchable.
When to use a link instead
If the video is longer than about 30 seconds or needs to stay high quality, do not fight the email limit. Upload it to a cloud service (Google Drive, OneDrive, Dropbox) and paste a share link into the email instead. The recipient streams or downloads it at full quality, your email sends instantly, and you avoid clogging their inbox. Many providers, including Gmail and iCloud, will even do this automatically when you attach a large file.
Quick decision rule
- •Short clip, needs to be inline and previewable: compress to MP4 under 20 MB and attach it.
- •Longer clip or quality is critical: upload to cloud storage and send a link.
- •Recipient on a strict corporate mail server: a link is almost always safer than an attachment.
The bottom line
For email, the magic number to aim for is under 20 MB. Trim aggressively, compress to an efficient MP4, and you can fit short clips comfortably within the limit. For anything longer, a cloud link is faster, cleaner, and keeps the quality intact, which is exactly what your recipient wants anyway.
Try it on your own video
BoltCompress applies everything in this guide automatically. Upload a video and compress it free in seconds.
Compress a Video