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Compress a video to under 25 MB

Twenty-five megabytes is the Gmail attachment limit. It is a comfortable size for a good-looking clip of a minute or two.

  • Nothing is uploaded. Your browser does the compression, so the file stays on your device.
  • Lands under the real limit. We aim a little below it, so the upload goes through first time.
  • Fast. A 30 second 1080p clip fits into 10 MB in about two seconds on a desktop.
Where are you sending it?

Custom size 25.00 MB. We aim for 24.25 MB, a small safety margin so the file never lands just over.

Sent to our servers: 0 bytes. It all happens in this tab.

When you need 25.00 MB

Gmail attachments, Slack clips, and shared drives with a modest cap.

What to expect

A minute stays at 720p and thirty seconds at full 1080p. Two minutes drops to about 540p. Because mail adds about a third in encoding, leave extra room if the recipient is not on Gmail.

How much video fits in 25 MB

Worked out with the same maths the compressor uses, for a typical 1080p phone or screen clip with sound. Fast motion needs more room, still scenes and screen recordings need less.

Clip lengthResolution we pickHow it looks
10 seconds1080pSharp
30 seconds1080pSharp
1 minute720pSharp
2 minutes540pGood on a phone
5 minutes360pWatchable, small
10 minutes270pWatchable, small

How we hit the number

We work out how many bits each second of video can use: the target size, minus a safety margin, divided by the length, minus the audio. Then we pick the largest resolution that still looks clean at that rate and encode with your browser's built-in video encoder. If the result is still over, we automatically try once more at a lower rate.

The target we aim for is 24.25 MB, which is 750 KB under 25.00 MB, so the file is not turned away over a few bytes.

Questions people ask

Does Gmail really allow 25 MB?

Yes, per Google's help page, for the whole message. Larger files turn into Drive links.

Will my video keep its sound?

Yes, we keep audio at a sensible bitrate.

Related

Limits change. We link the official page wherever there is one, and the safety margin means a small change is unlikely to matter. Last updated 2026-11-09.