Does converting lose quality?

A little, because the video is always re-encoded (H.264 for MP4 and MOV, sound at 128 kbps) — even for a plain MOV-to-MP4 change. The default Standard quality never uses a higher bitrate than the original; to keep as much as possible, choose High.

How long does it take?

It depends on the video’s length and resolution and on your device. The page shows live progress and you can cancel at any time; AVI goes through software conversion and is noticeably slower.

Why will my file not convert?

Common reasons: the format genuinely is unsupported (WMV, FLV, RM, DRM-protected); the file is damaged or not fully downloaded; or your browser cannot decode the codec inside (some very old codecs, or H.265 in a browser without support for it). When it fails, the page tells you why.

Can I convert only the audio?

Yes — use “Extract the audio”, which exports M4A, OGG, WAV or MP3.

Will the file get bigger?

Usually not: the video bitrate never exceeds the original’s. For something smaller, choose Compact quality, lower the resolution, or use “Compress video online”.

Convert video format

Convert between MP4, MOV, MKV and WebM, right on your device.

Drop a video here, or click to choose

MP4 · MOV · MKV · WebM · audio · images · subtitles · ZIP

Convert videos between MP4, MOV, MKV and WebM for free, changing resolution and quality in the same pass if you like. It runs in your browser, so nothing is uploaded. No account, no watermark.

When a file will not open, the problem is usually not a broken file — it is that the player or platform does not recognise the container. Converting to MP4 is the safest move: practically everything accepts it.

You can output MP4, MOV, MKV or WebM, which covers the overwhelming majority of everyday cases. “More settings” lets you change the resolution (480p to 4K) and quality, or remove the audio, in the same pass rather than running a second tool.

WMV, FLV and RM are not supported — browsers cannot read them. AVI works, but it first downloads a software converter of about 31 MB, is noticeably slower, and can only become MP4.

FAQ

Does converting lose quality?: A little, because the video is always re-encoded (H.264 for MP4 and MOV, sound at 128 kbps) — even for a plain MOV-to-MP4 change. The default Standard quality never uses a higher bitrate than the original; to keep as much as possible, choose High.
How long does it take?: It depends on the video’s length and resolution and on your device. The page shows live progress and you can cancel at any time; AVI goes through software conversion and is noticeably slower.
Why will my file not convert?: Common reasons: the format genuinely is unsupported (WMV, FLV, RM, DRM-protected); the file is damaged or not fully downloaded; or your browser cannot decode the codec inside (some very old codecs, or H.265 in a browser without support for it). When it fails, the page tells you why.
Can I convert only the audio?: Yes — use “Extract the audio”, which exports M4A, OGG, WAV or MP3.
Will the file get bigger?: Usually not: the video bitrate never exceeds the original’s. For something smaller, choose Compact quality, lower the resolution, or use “Compress video online”.

FAQ

Related tools