Compress Video — Shrink File Size in Your Browser
Shrink a video’s file size right in your browser. Choose a quality level, and the tool re-encodes it to a smaller MP4 — showing how much you saved. Your video is never uploaded.
How to use it
- 1Choose a video
Drop a video onto the drop zone, or click to select one.
- 2Pick a quality
Choose Best quality, Balanced or Smallest depending on how much to shrink.
- 3Compress
Click Compress. The first run loads the encoder (~30 MB) once.
- 4Download
Check the size saved, preview the result, and download the smaller MP4. Nothing was uploaded.
Quality vs size
Compression trades a little visual quality for a much smaller file. “Best quality” keeps it close to the original; “Smallest” squeezes hardest. The result is a widely-compatible H.264 MP4, and you can see the before/after size before downloading.
Private, in-browser encoding
A WebAssembly build of ffmpeg does the work inside the page, so the file never leaves your device. Because it re-encodes the video, it is best suited to short clips; the first run loads the encoder (~30 MB) once.
Frequently asked questions
Is my video uploaded to a server?
No. Compression happens entirely in your browser with a WebAssembly build of ffmpeg — your video never leaves your device.
How much smaller will it get?
It depends on the source and the quality level you pick. The tool shows the before/after size and the percentage saved after compressing.
What format is the output?
A widely-compatible H.264 MP4, which plays on virtually any device or platform.
Is there a size limit?
Because it runs in your browser, very large or long videos can be slow and memory-heavy. Short clips compress best.
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