Free Tools

Compress video in your browser

Q: How much smaller will my video be?

Typically 50 to 80 percent smaller. The exact figure depends on how the original was encoded: footage straight from a phone or a screen recorder usually has a lot of headroom, while an already-compressed download has less.

Q: How long does it take?

Usually a fraction of the clip length, because the encoding is hardware accelerated. A one minute clip typically finishes in a few seconds on a modern laptop or phone.

Make MP4 and MOV files dramatically smaller without uploading them anywhere. Drop the resolution, pick a quality level, and keep the audio exactly as it was.

Nothing is uploaded. Your video is decoded and re-encoded on your own device.

Settings

Resolution

Videos are never enlarged. Choosing a size bigger than the source keeps the source size.

Quality

Balanced targets roughly the bitrate a streaming service would use for this size.

Frame rate

Capping the frame rate on high-frame-rate footage is often the single biggest saving.

Keep the audio track

Audio is copied across untouched, never re-encoded, so it stays bit for bit identical.

Drop a video here

or click to choose a file — MP4, M4V or MOV

Questions

Is my video uploaded anywhere?

No. The file is read, decoded, re-encoded and rebuilt inside your browser using the WebCodecs API. Nothing is sent to a server — which is also why there is no file size cap and no queue to wait in.

Which files can I compress?

MP4, M4V and MOV files containing H.264 or HEVC video. WebM, MKV and AVI use different container formats that this tool does not read, and it says so up front rather than failing halfway through.

Does compressing damage the audio?

No. The audio track is copied across untouched rather than re-encoded, so it comes out bit for bit identical to the original — including the edit list that keeps it in sync with the picture. Only the video is re-encoded, because that is where almost all of the file size is.

How much smaller will my video be?

Usually 50–80% smaller. It depends on the original: footage straight from a phone or a screen recorder normally has a lot of headroom, whereas something already compressed for the web has less left to give.

Why does it need a recent browser?

It uses WebCodecs to reach the same hardware video encoder your device uses when it records video. That is what makes it many times faster than playing the clip through. Chrome, Edge, Safari 16.4+ and Firefox 130+ all support it; anything older is told plainly that it cannot run this.

How long does it take?

Normally a fraction of the clip's length, since the encoding is hardware accelerated. A one-minute clip typically finishes in a few seconds on a current laptop or phone.