Compresser une vidéo

Compress Video: make phone videos shareable without ruining them

A one-minute phone video can easily weigh 200 MB or more — too large for WhatsApp, rejected by email, and slow to upload on a weak connection. Compress Video shrinks MP4 and MOV files so they fit the places people actually share video, using your device's own encoder when available, with an FFmpeg fallback for formats and settings the device encoder can't handle.

Video compression is heavier work than photo compression, and honesty about that is part of using the tool well. Encoding takes real time, especially for long clips or 4K footage, and the browser tab must stay open while it runs — closing it or letting the phone sleep stops the job. The payoff is a file that sends in seconds instead of timing out, and plays smoothly on the recipient's phone. Expect some softening of fine detail; the goal is a video that looks good on a phone screen and arrives at all, not a cinema master.

How to compress a video

1. Open Compresser une vidéo and add your MP4 or MOV file.
2. Choose your compression level — a moderate setting suits most sharing, while a stronger setting is for strict size limits.
3. Start the compression and leave the browser tab open and the device awake. Long videos can take several minutes; this is normal, not a freeze.
4. Preview the result, check that motion looks smooth and audio stays in sync, then download it. Keep the original if you may need full quality later.

When to use it — and when not to

Use it when a video must fit WhatsApp, email, a form upload, or a slow connection, and when the audience will watch on a phone. Don't use it on footage you plan to edit professionally afterwards — compress the export you share, not the master you edit. Also avoid compressing an already tiny, heavily compressed clip; there is little size left to save and quality will visibly suffer.

Frequently asked questions

Why does compression take so long?

Video encoding processes every frame, so a long or high-resolution clip is genuinely heavy work. Keeping the tab open and the device awake lets it finish; interrupting it means starting over.

Will the compressed video still play everywhere?

Yes — the output is a standard MP4-style file that plays on phones, computers, and in messaging apps, which is the whole point of compressing for sharing.

Why does my video need FFmpeg sometimes?

Some formats and settings aren't supported by the device encoder, so the tool falls back to FFmpeg running locally in your browser. Either way, the work happens on your device.

Is my video uploaded to a server?

Never. Encoding runs on your own device inside the browser — your personal videos stay private and never pass through anyone else's infrastructure.

See the Compress Video guide. Related tools: Vidéo vers MP3, Compresser des images.