Compress Video to Size

Compress a video to a target file size you choose in MB, directly in your browser with no uploads. This free video compressor reads your clip's duration, works out the H.264 bitrate needed to hit your size budget, and re-encodes it to MP4 using ffmpeg.wasm. It is perfect when you need to compress a video to 8MB for Discord, fit an email or upload limit, or reduce a video to a specific MB size. Because it uses single-pass bitrate targeting, the output lands close to your chosen size, and your video never leaves your device.

🔒 100% private — files never leave your device

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How to use

  1. Drop a video file or click to select one (any video format your browser can read).
  2. Enter the target file size in MB — the default is 8, but you can set any value from 1 MB up.
  3. Click Compress and wait while the engine reads the duration and re-encodes your video.
  4. Download your compressed MP4, ready to share or upload.

Frequently asked questions

What video formats can I compress?

You can load any video your browser recognizes — MP4, MOV, WebM, MKV, AVI and more. Whatever you upload, the compressed result is always saved as an MP4 for maximum compatibility.

Is my video uploaded to a server?

No. Everything runs 100% locally in your browser using ffmpeg.wasm, so your video is never uploaded and never leaves your device. It is completely private.

Will the output be exactly the size I asked for?

Not exactly. The tool uses single-pass bitrate targeting, which is approximate, so the result lands close to but not precisely on the target. If you have a hard limit, pick a slightly lower target for headroom.

Why is the first run slow to start?

On the first run the tool downloads the ffmpeg engine (about 30 MB). It is cached afterward, so later compressions start instantly and work offline.

What format and quality is the output?

The compressed video is saved as an MP4 with H.264 video and 128k AAC audio, which plays in virtually every modern player, browser, and app. Quality scales with your target size — a bigger MB budget keeps more detail.

Is there a file size or length limit?

There is no fixed upload limit because nothing is uploaded, but very large or long videos take more time and memory to re-encode in the browser. The minimum target you can set is 1 MB.

About this tool

Free online video compressor that shrinks any video to a target file size you pick in MB, right in your browser. H.264 MP4, no uploads, 100% private and client-side.

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