Convert between MP4, WebM, MOV and MKV. The tool reads your file first and copies the tracks when they already fit, so many conversions finish in seconds.
Your files are processed in your browser, on your own device. Nothing is uploaded to a server.
Change a video from one format to another without installing anything. This converter writes MP4, WebM, MOV and MKV, and before it starts it reads your file and works out the fastest honest route: when the picture and sound already fit the target format, it simply re-wraps them, and the job finishes in seconds with the quality untouched.
That probe step is the part most converters skip. A WebM holds VP8 or VP9 picture, which an MP4 cannot store, so that job is a real conversion and the page says so, with a quality choice. An MP4 moving to MKV is usually a re-wrap. The tool works out which kind of job yours is and reports it in the result, so the wait is never a mystery for long.
1. Drop your video into the box, or click to choose it.
2. Pick the target format: MP4 for players and phones, WebM for the web, MOV for Apple editors, MKV for an archive copy.
3. Choose the quality used when a job does re-encode. Balanced is the right default. High keeps more detail in a bigger file, Smaller favours size.
4. Press Convert the Video and download the result.
MP4 plays on everything and is the answer whenever a site, a phone or a TV refuses your file. WebM files are smaller at the same quality and are made for browsers, but some editors and older devices cannot open them. MOV suits Apple software and iPhone workflows. MKV is a flexible archive box that holds almost any track unchanged, which is why the re-wrap route is so common with it.
One thing to know before the first job: the video engine is a real encoder that runs inside your browser. The first time you press the button it downloads about 31 MB of engine files, once, and your browser keeps them for next time. Nothing about your video travels anywhere, because there is no server for it to travel to.
Four output formats only, on purpose: AVI, WMV and FLV are formats the browser encoder cannot write well, and listing them would mean failed jobs. Re-encode jobs run at a browser pace, so files under 200 MB and 10 minutes are the comfortable range. Re-wrap jobs can take the full 500 MB. If the sound is in a form the target cannot hold, the sound is re-encoded and the picture is kept where possible. To shrink a video rather than reformat it, the compress video page is the right tool, and all 23 tools sit in the video tools collection.
Picture a video file as a parcel: the container is the box, the codecs are what’s inside. Swapping a box that already fits the contents is free and instant, which is the re-wrap route, common when moving between MP4 and MKV. Re-encoding is repacking the contents themselves into a different form, which is slower and always costs a little fidelity, the way re-saving a photo does. The probe step on this page exists to work out which errand you are actually on, and the result tells you which one it was.
Not when the tool takes the re-wrap route: the picture and sound are copied as they are, only the box changes. When a real conversion is needed, some loss is unavoidable, and the Balanced setting keeps it below what most viewers can see.
Seconds means your tracks already fit the new format and were copied. Minutes means the picture had to be rebuilt frame by frame, which is real work for any encoder, and a browser one works at a modest pace.
Yes, that is one of the standard jobs here. The picture is re-encoded to VP8 and the sound to Opus, and the file usually comes out smaller than the MP4.
The encoder that runs in the browser cannot write AVI honestly. Rather than offer a button that fails or produces a poor file, the format is left out.
500 MB is the ceiling. For re-encode jobs, 200 MB and about 10 minutes is the range where the wait stays reasonable.
No server is involved. The file is converted in your tab, on your device, and downloaded from the browser.
Same rules as this one: free, in your browser, with nothing uploaded.
Take the sound out of any video as an audio file.
The classic job. Video in, MP3 out.
A smaller video for WhatsApp, email and uploads.
Cut the dead seconds from the start and end.
Turn a short clip into a GIF that loops.
Any video file in, a plain MP3 of its sound out.
Join clips end to end into one video file.
A GIF saved as a small MP4 that plays everywhere.