Which formats are supported?

Input: MP4, MOV, AVI, MKV, WebM, FLV, WMV, 3GP, M4V. Output: the same list. Codec remux is used when possible for maximum speed.

Will converting reduce quality?

If input and output share the same codec, we copy streams without re-encoding (zero quality loss). Otherwise a quality preset controls the trade-off.

Single files up to 2 GB work reliably in modern browsers. Larger files may run out of browser memory — consider splitting first.

Yes on iOS Safari 16+ and Chrome on Android. Conversion takes longer on mobile CPUs — short clips (< 2 min) are best.

Currently one file per run. We plan to add batch conversion soon.

Yes, unlimited, no watermark, no sign-up. We do not send your files anywhere.

Переключайтесь между MP4, MOV, AVI, MKV, WebM, FLV и WMV в браузере. Без загрузки, без аккаунта, без водяных знаков.

1
Pick your source video
Drop or browse for the video you want to convert. Any format up to 2 GB is accepted.
2
Select the target format
Choose MP4, MOV, AVI, MKV, WebM, FLV, or WMV. Quality presets balance file size vs. visual fidelity.
3
Download the converted file
Conversion runs locally with FFmpeg.wasm. Your video never leaves your device.

Files stay local
All conversion happens in your browser via WebAssembly. No upload to a server, no cloud copy.
All major formats
Input and output support MP4, MOV, AVI, MKV, WebM, FLV, WMV, and 3GP. One tool covers every format you need.
Quality presets
Pick from Original, High, Balanced, or Small to trade quality for file size smartly.
Parallel encoding
FFmpeg.wasm uses multi-threaded encoding on supported browsers (Chrome, Edge) for faster results.
Unlimited and free
No sign-up, no watermark, no file-count limit. Convert as often as you need.

Editor compatibility
Final Cut wants MOV, Premiere prefers MP4, DaVinci eats MKV — convert once to the format your editor loves.
Platform requirements
Twitter caps at MP4; WhatsApp prefers MP4; Discord auto-plays MP4 and WebM. Pick the right container.
Legacy device playback
Older TVs and media players sometimes only read AVI or WMV. Convert to match the target device.

Создано для авторов, журналистов, студентов и исследователей по всему миру.

Which formats are supported?: Input: MP4, MOV, AVI, MKV, WebM, FLV, WMV, 3GP, M4V. Output: the same list. Codec remux is used when possible for maximum speed.
Will converting reduce quality?: If input and output share the same codec, we copy streams without re-encoding (zero quality loss). Otherwise a quality preset controls the trade-off.
Is there a size limit?: Single files up to 2 GB work reliably in modern browsers. Larger files may run out of browser memory — consider splitting first.
Does it work on mobile?: Yes on iOS Safari 16+ and Chrome on Android. Conversion takes longer on mobile CPUs — short clips (< 2 min) are best.
Can I convert multiple files at once?: Currently one file per run. We plan to add batch conversion soon.
Is this tool really free?: Yes, unlimited, no watermark, no sign-up. We do not send your files anywhere.