Quick answer: To compress a video to 100 MB, open it here, keep the 100 MB target and download the MP4. Up to about three minutes stays at 1080p, five minutes at 720p and ten minutes at 540p for typical footage. It is compressed in your browser, so a large file never has to be uploaded first.
100 MB holds a few minutes in full HD or a lecture-length recording at a lower resolution. Keep the target, check the estimate, and get an MP4 that fits the limit.
Compress video to 100 MB at a glance
| Price | Free, no sign-up, no watermark, no daily limit |
|---|---|
| Accepts | MP4 · MOV · WebM · MKV |
| Largest file | 2 GB per file |
| Where it runs | In your browser: files are never uploaded |
| Works on | Chrome and Edge, Safari 17+, Firefox 130+ on iPhone, Android, Windows, Mac and Linux |
| Send the result | Download it, or send it free with a link or by email (up to 20 GB) |
How to compress video to 100 MB
- Choose the video: a 4K phone clip, a screen recording or a meeting.
- Keep 100 MB, or pick 50 MB, 200 MB or your own size.
- Press Compress to 100 MB. Long videos take a while; keep the tab open.
- Check the result and download it.
How much video fits in 100 MB
| Length | Resolution the tool picks | Good for |
|---|---|---|
| Up to 3 minutes | 1080p | Clips, short films, product videos |
| 5 minutes | 720p | Vlogs, presentations |
| 10 minutes | 540p | Tutorials, walk-throughs |
| 15 to 20 minutes | 480p to 360p | Talks and meetings |
| 30 minutes | 240p | Only if the picture barely matters |
Figures are for a typical 30 fps video with sound. A 4K phone video can take roughly 170 to 400 MB per minute, depending on the phone and the frame rate, so even a short 4K clip is over 100 MB; compressing it to 1080p is what makes it fit.
Where a 100 MB limit applies
- Facebook Messenger accepts files up to 100 MB.
- GitHub blocks files larger than 100 MB in a repository, which catches demo videos and screen recordings.
- Portals and learning platforms: assignment uploads, competition entries and job applications often allow around 100 MB per file; the upload page is the authority.
See our file size limits guide for more.
Long recordings: lectures, meetings and screen captures
Recordings of slides or a screen change little from frame to frame, so they compress far better than camera footage. For those, set Maximum resolution to 720p so text stays readable, and remove the sound only if it really is not needed; speech takes little space anyway.
The video is read from your device in pieces and compressed by your browser, so even a 2 GB recording works without an upload. A computer is much faster than a phone for long files. If the result must stay in full quality, skip compression and send the original with a link, free up to 20 GB.
How this compares
| This tool | Online converters (e.g. Clideo, FreeConvert or CloudConvert) | Desktop apps (e.g. HandBrake) | |
|---|---|---|---|
| Your file is uploaded | No | Yes, to their servers | No |
| Install or account | None | Account for some features | Install needed |
| Watermark or daily limits | None | Common on free plans | Depends on the app |
Plans of other services change; check their sites. More video tools.
Frequently asked questions
How do I compress a video to under 100 MB?
Open it here, keep the 100 MB target and press Compress to 100 MB. The tool calculates the bitrate from the length of the video and keeps the highest resolution that still looks clean.
Will my 4K video stay 4K?
Only if it is very short. At 100 MB, a few minutes of footage looks best at 1080p, so the tool usually steps down. You can set the maximum resolution yourself.
How long does it take?
It depends on the length of the video and on your device: a recent computer with hardware video encoding is much faster than an older phone. The progress bar shows how far it has got, and you can cancel at any time.
Is my video uploaded?
No. It is compressed in your browser and stays on your device.
Need to send a big file?
Send files up to 20 GB with a download link or by email. Free, no account needed, original quality.
Send large files free