Compress MP4 Online — Free & Private
Reduce MP4 file size in your browser — no upload, no watermark.
Compression level
Drop a video here or click to choose
compressed on your device — your video is never uploaded
MP4 is the most common video format, and this tool reduces its file size for email, upload, or storage — with no watermark and no account. You pick the balance between size and quality.
It all runs locally via WebAssembly, so your video never leaves your device.
More sizes & options
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Frequently asked questions
- Does the output stay an MP4?
- Yes — it re-encodes to a smaller H.264 MP4 that plays everywhere, so you can use it exactly where you used the original.
- Is there a file-size limit?
- There's no server limit since it's local, but very large files use more of your device's memory and take longer to process.
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🔒 Your files never leave your device. This tool runs entirely in your browser — nothing is uploaded.