When you need 30.00 MB
Course and assignment uploads, CMS media libraries and messengers with a 30 MB cap.
What to expect
Two minutes of 720p fits comfortably. Thirty seconds can stay at full 1080p.
How much video fits in 30 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 length | Resolution we pick | How it looks |
|---|---|---|
| 10 seconds | 1080p | Sharp |
| 30 seconds | 1080p | Sharp |
| 1 minute | 1080p | Sharp |
| 2 minutes | 720p | Sharp |
| 5 minutes | 360p | Watchable, small |
| 10 minutes | 270p | Watchable, 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 29.10 MB, which is 900 KB under 30.00 MB, so the file is not turned away over a few bytes.
Questions people ask
My assignment portal says 30 MB. How long can my video be?
About two minutes at 720p, or around five at 360p. Lecture-style recordings with a still background can stay sharper for longer.
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.