Drop a video and pick the format you need. When the video inside already fits the new format, it is copied as is, so the conversion takes seconds and loses nothing. The video never leaves your device. It is read and saved by your browser, so there is no upload, no queue and no copy on a server.
Older formats like AVI, WMV, MPG and FLV work too. Your browser can’t read them on its own, so for those a converter (ffmpeg) is loaded into the page first.
How to convert a video
- Drop your video on the box above.
- Pick MP4, WebM, MOV, MKV or MP3.
- Press Convert and download the new file.
Which format should I choose?
MP4 with H.264 plays on every phone, computer, TV and website, so it is the safe choice. WebM is the open format of the web and works well in browsers. MOV is Apple’s format, handy for Final Cut and iMovie. MKV holds almost anything, including several sound and subtitle tracks, and suits archiving.
Copy or re-encode?
A video file is a container (MP4, MOV, MKV) with encoded streams inside (H.264, HEVC, VP9, AAC). Changing the container alone is quick and lossless. If the streams don’t fit the new container, or don’t play everywhere, they are encoded again at high quality. Converting to MP4 or MOV always gives H.264 video and AAC sound, the pair that plays everywhere.
Old and unusual formats
AVI, WMV, MPG, VOB, FLV and similar formats are opened with ffmpeg running inside the page. It downloads once (about 32 MB) and then stays in your browser’s cache. If the video inside is H.264, it is copied and finished on the fast path; older codecs such as MPEG-2, WMV or DivX are decoded and encoded by ffmpeg, which is slower.
Questions
Is it really free?
Yes. There is no account, no watermark and no limit on the number of files.
How big can the file be?
There is no fixed cap. Several gigabytes work on a computer. The old-format converter works in the browser’s memory, so very large AVI or WMV files are best on a desktop.
Can I convert many files at once?
Yes, with the bulk converter.
Will the quality drop?
Not when the streams are copied. When they are re-encoded, the tool uses high-quality settings, so the difference is very hard to see.