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Compress a video to 100 MB

A hundred megabytes is enough for a long, sharp video.

  • 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 100 MB. We aim for 97.00 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 100 MB

Signal, iMessage, Slack and many course and company upload forms.

What to expect

Two minutes stays at full 1080p, five minutes at 720p, and ten minutes at about 540p.

How much video fits in 100 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 minute1080pSharp
2 minutes1080pSharp
5 minutes720pSharp
10 minutes540pGood on a phone

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 97.00 MB, which is 3.00 MB under 100 MB, so the file is not turned away over a few bytes.

Questions people ask

How long does it take?

On a recent laptop, roughly as long as the video plays, often faster. Phones take longer. Keep the tab open until it finishes.

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.