WebM to MP4 converter.
Turn WebM clips into H.264 MP4 that plays on iPhone, QuickTime, TVs, and PowerPoint.
Drop a video here or click to browse
WebM · processed privately, never uploaded
Convert WebM (VP8 or VP9 video) into an H.264 MP4 that plays almost anywhere, from iPhones to smart TVs. It runs fast, needs no account, and your files stay private and are never uploaded.
Why WebM keeps refusing to play
WebM is open, royalty-free, and built for the web, which is exactly why OBS recordings and a lot of downloaded clips land in that format. The trouble starts the moment you leave the browser. QuickTime won't open it, the native iPhone and iOS photo gallery ignores it, plenty of smart TVs and older editors choke on it, and PowerPoint refuses to embed it. Some upload forms reject the extension outright. Re-encoding the VP8 or VP9 video into H.264 inside an MP4 container fixes all of that, because H.264 MP4 is the one format that plays essentially everywhere without extra codecs.
Choosing resolution and quality
By default the converter keeps your original resolution, so a 1080p recording stays 1080p. When a file is too large to email or upload, that's where the controls earn their keep. Cap the output at 1080p or 720p to cut the pixel count and shrink the result noticeably, then lean on the quality preset to trade a little sharpness for a smaller size. One thing worth knowing: capping only scales down. Converting a 720p WebM won't magically produce a crisp 1080p MP4, since there's no extra detail to invent. Start high, step down only if you need the space.
What to expect from the MP4
Because this is a real re-encode rather than a rename, the output is a clean H.264 stream that decoders handle predictably. Audio comes along too, with the Opus or Vorbis track converted so it stays in sync. The MP4 keeps the full length of your clip at its original volume. There's no trimming, fading, or leveling here, so what goes in is what comes out, just in a format that opens on the devices that were shutting you out. Need to go the other way for a lighter web file? The MP4 to WebM page does the exact reverse.
Tips
- OBS saves recordings as WebM by default, which is why they won't drop into PowerPoint or iMovie until you convert.
- Keep the original resolution unless the file is too big to send, then step down to 1080p or 720p.
- Capping resolution shrinks the file but never sharpens it, so don't expect 720p footage to look like 1080p.
- If an upload form rejected your video for its format, an H.264 MP4 almost always sails through.
How it works
- 01
Add your WebM
Drop in the WebM file you saved from OBS, a screen recorder, or a downloaded web clip.
- 02
Set resolution and quality
Keep the original size, or cap it at 1080p or 720p and pick a quality preset to control file size.
- 03
Convert and download
The clip re-encodes to H.264 MP4 and downloads straight back to you, ready to play or share.
Questions
- Will this play on my iPhone?
- Yes. The iPhone gallery and QuickTime don't recognize WebM, but they open H.264 MP4 natively, so the converted file plays and saves without any extra app.
- Are my files private?
- Yes. Your video is processed privately and never uploaded, there's no account to create, and nothing comes back with a watermark.
- Can I make the MP4 higher resolution than the WebM?
- No. Converting re-encodes the existing video and can cap resolution to shrink a large file, but it can't upscale or add detail that wasn't recorded.
- Does converting cut or edit my clip?
- No. You get the full-length video at its original volume. The tool only changes the format, resolution cap, and quality; it doesn't trim, fade, or adjust audio levels.