Change container without re-encoding

How it works

1. 1

   Add your video

   Drop, pick, or paste a file. It stays on your device.

2. 2

   Pick the new container

   MP4, MOV, or MKV (WebM for WebM-family sources). The streams are rewrapped, not re-encoded.

3. 3

   Download

   Done in seconds, even for gigabyte files, with zero quality loss.

Why nothing uploads

Other tools send your video to their servers, which costs them money per file, so they add watermarks, cap file sizes, and make you sign up. This tool does the work right here in your browser using your own device. Your file is never uploaded, so there is no wait, no watermark, no size limit, and no account.

Questions

What's the difference between remuxing and converting?

Converting re-encodes the picture, which takes minutes and always costs some quality. Remuxing just moves the existing streams into a new container, seconds, and bit-for-bit identical quality.

When does remuxing work?

When the streams already fit the target. iPhone MOV files carry H.264 or HEVC, which drop straight into MP4, the classic case. If the streams don't fit, you'll get a clear message pointing at the converter.

Why would I remux MOV to MP4?

MP4 plays on far more devices, players, and websites, and most editors accept it. Remuxing gets you there without touching quality.

Why is it so fast?

No decoding or encoding happens, the video and audio bytes are copied as-is into the new file structure.

Does my video get uploaded?

No. Remuxing happens in your browser; your file never leaves your device.

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