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MOV, WebM and GIF to MP4 converter

Turn MOV, WebM, MKV and GIF files into MP4s that play on any phone or computer. H.264 videos are copied in seconds with nothing lost. Nothing is uploaded.

  • Runs in your browser
  • Nothing is uploaded
  • Free, no sign-up

or drop them here. MOV, WebM, MKV, MPEG-TS, MP4 and GIF. Nothing is uploaded.

Picture

Videos already in H.264 are copied as they are, which takes seconds. Others, like iPhone HEVC videos and WebM's VP9, are converted to H.264: slower, but the MP4 plays on every phone, computer and website.

AAC and MP3 sound is copied as it is; other sound is converted to AAC where this browser can. GIFs have no sound.

    How it works

    Choose one or more videos or GIFs. Each is read in your browser, and the page says what will happen to it before anything is converted. A picture and sound that MP4 players already play are copied into the new file as they are; anything else is decoded and encoded again by your browser's own video and sound encoders. Files are converted one after another, and each MP4 is opened again to check it plays before it is offered for download, on its own or with the others in one ZIP.

    MOV to MP4

    MOV and MP4 are close cousins, so an H.264 MOV from a camera, Mac screen recording or older iPhone becomes an MP4 by copying, in seconds and with nothing lost. Videos from iPhones since 2017 are HEVC (H.265): by default they are converted to H.264, which every phone, computer and website plays; with Keep as it is, the HEVC picture is copied instead, which is fast and keeps HDR. Portrait videos stay upright.

    WebM and MKV to MP4

    WebM videos, from browsers, screen recorders and sites like YouTube, are usually VP9 or AV1 with Opus sound, which many players don't open. They are converted to H.264 with AAC sound. With Keep as it is, the picture is copied into the MP4 instead, which is fast but still needs a player that knows VP9 or AV1. MKV and MPEG-TS recordings, which OBS can save, work the same way, and their H.264 is copied.

    GIF to MP4

    GIFs are read by this page's own GIF reader, frame by frame, the way browsers show them, and each frame is encoded for as long as the GIF shows it. A GIF's see-through parts are filled with white or black, as you choose, and a very small GIF is made two or more times larger, pixel for pixel, so it doesn't look broken in video players. To go the other way, use the video to GIF converter.

    Questions

    Does converting MOV to MP4 lose quality?

    Not when the MOV is H.264, as most cameras and screen recorders make it: the picture and sound are copied into the MP4 exactly as they are, so nothing is lost and it takes seconds. iPhone videos are usually HEVC; converting them to H.264 encodes the picture again at a bitrate chosen to keep it looking the same. Choose Keep as it is to copy HEVC instead.

    Why turn a GIF into an MP4?

    An MP4 of the same animation is usually a fraction of the GIF's size, has millions of colours instead of 256, and is what apps such as Instagram and TikTok take for moving pictures. The page says how much smaller each MP4 came out. Every frame keeps its own timing, and you can play the animation more than once, since videos don't repeat by themselves.

    Will the MP4 play on an iPhone, a Windows PC or WhatsApp?

    Yes, when it is H.264 with AAC sound, which is what this tool makes wherever your browser can encode H.264: Chrome, Edge and Safari on most computers and phones. The page says before converting if your browser can't, and which players the MP4 then plays in.

    Are my videos uploaded?

    No. The files are read and the MP4s made in your browser, on your device, so it works offline and large videos don't have to upload first. The MP4s have no title, location or camera details from the originals; iPhone videos carry the place they were filmed, and it is left out.

    Limits

    Opens MOV, MP4, M4V, WebM, MKV and MPEG-TS videos up to 4 GB each, and GIFs up to 300 MB, 20 files at a time. MP4s are made in memory, so each can be up to 2 GB. Camcorder MTS and M2TS files, AVI and WMV can't be opened, and Apple ProRes can't be converted, since browsers can't decode it.

    Converting needs a browser that can decode the video and encode H.264; copying needs neither. Chrome, Edge and Safari on most computers and phones encode H.264. Some browsers, such as Chromium on Linux, can't, and the page says so: they still copy H.264, HEVC, VP9 and AV1 into MP4s, and make GIFs and other videos into VP9 MP4s, which play in browsers, VLC and on Android but not in QuickTime or on older iPhones. Converting HEVC needs a browser that decodes it, such as Safari, or Chrome and Edge on most recent devices. HDR videos converted to H.264 come out in standard colours. Videos with a see-through background can be copied but not converted yet. Long videos take a while to convert, and phones take longer than computers; keep the page open until it finishes.

    Privacy

    This tool runs entirely in your browser. The files you open and what you type are never sent to a server, and nothing is stored after you close the page. See the privacy page.

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