Convert video online

Convert video between MP4, WebM, MKV, MOV, and GIF directly in your browser — no software to install and nothing to upload. This free online video converter runs entirely on your device using ffmpeg.wasm, so your files stay private and never leave your computer. Drop in one video, choose your target format, and download the converted file in seconds. MP4 output is re-encoded to H.264/AAC for broad compatibility, while WebM, MKV, MOV, and GIF use proven container defaults. It works on Windows, macOS, Linux, Android, and iOS in any modern browser.

🔒 100% private — files never leave your device

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How to use

  1. Drag and drop your video file or click to select it from your device.
  2. Pick the output format you want: MP4, WebM, MKV, MOV, or GIF.
  3. Click Convert and wait while the conversion runs locally in your browser.
  4. Download your converted video — nothing was ever uploaded to a server.

Frequently asked questions

What video formats can I convert between?

You can convert your video to MP4, WebM, MKV, MOV, or GIF. Most common input video formats are supported, since the converter reads whatever your browser and the built-in ffmpeg engine can decode.

Are my videos uploaded to a server?

No. Conversion happens 100% in your browser using ffmpeg.wasm. Your video is processed locally on your device and is never uploaded, so your files stay completely private.

Is there a file size or length limit?

There is no fixed limit, but because everything runs in your browser, very large videos take more time and memory. Conversion speed depends on your device, so shorter clips and smaller files process fastest.

How does the MP4 conversion work?

MP4 output is re-encoded with the H.264 video codec and AAC audio for wide compatibility across devices and players. WebM, MKV, MOV, and GIF use ffmpeg's default settings for each container.

Why is the first conversion slower?

On the first run the converter downloads the ffmpeg engine (about 30 MB). After that it is cached and runs offline, so later conversions start instantly without re-downloading.

Can I convert a video to an animated GIF?

Yes. Select GIF as the output format to turn your video clip into an animated GIF entirely in your browser, with no uploads and no watermark.

About this tool

Free online video converter. Convert MP4, WebM, MKV, MOV, and GIF 100% in your browser — fast, private, and secure with no uploads and no watermarks.

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