# WebM to MP4 Converter: H.264 and AAC, Free - [Home](/) - - - [Tools](/tools/) - - - WebM to MP4 Converter # Convert WebM to MP4 (H.264 and AAC) Screen recorders, browsers and download sites love WebM, but iPhones, QuickTime and most video editors don't. This turns WebM files into MP4 with H.264 video and AAC audio, re-encoding them on your own device. Conversion settingsConvert to MP4 Video codec when re-encoding H.264 Always re-encode the videoOff: video that already fits the new format is copied as is, in seconds and with no quality loss. On: every file is re-encoded to H.264, which is slower but gives the most widely playable file. Drop videos here, or click to choose MP4 - MOV - MKV - WebM - M4V - up to 2.00 GB each Choose videos Note: videos are converted on your device and never uploaded. Only the main video and audio tracks are kept; subtitles and extra audio tracks are left out. In browsers without their own AAC encoder (Firefox, and Chrome or Edge on Linux), turning Opus or Vorbis audio into AAC downloads an encoder from dragbin.com the first time; only the encoder is downloaded. AAC encoding (in browsers without a built-in AAC encoder) by [FFmpeg's libavcodec](https://ffmpeg.org/) ([LGPL-2.1-or-later](https://ffmpeg.org/legal.html)), loaded as a separate file only when needed. Need WebM, MOV or MKV instead? Use the [video converter](/tools/video-converter/). Free to UseNo hidden chargesNo Software InstallationRuns in your browserNo Sign UpStart instantly ## Recorded something worth keeping? Store your recordings in DragBin, encrypted on your device before they're uploaded. DragBin protects files with [client side](/client-side-encryption/), [quantum resistant encryption](/post-quantum-encryption/) (ML-KEM + AES-256) keeping sensitive data private with a [zero knowledge](/zero-knowledge-encryption/) security architecture. - Get 5GB quantum resistant storage forever - Unlimited sharing, unlimited bandwidth and unlimited file size uploads - Integrated Global CDN and preview media in 4k/8k [Try DragBin Today](https://dragbin.com) ## How to Convert WebM to MP4 MP4 is already selected. Add your files and let them run. Step 1 Drop, paste or choose one or more WebM files. Step 2 Check each file's line, for example "Re-encode - VP9 -> H.264, Opus -> AAC", then press Convert. Step 3 Wait for the re-encode to finish, then download the MP4s one by one or as a zip. ## Why Convert WebM to MP4? WebM is made for browsers. MP4 with H.264 and AAC is what almost everything else expects. ### Plays on iPhone H.264 and AAC in an MP4 open in Photos, QuickTime, Windows and Android players alike. ### Ready for Editors Drop the result into Premiere, Final Cut, iMovie or CapCut without codec errors. ### Slower Than a Remux WebM's codecs don't fit in a widely playable MP4, so every frame is re-encoded. Long recordings take minutes. ## Re-encoded on Your Device The heavy lifting happens in your browser tab, so your recordings are never uploaded. ### No Uploads Nothing leaves your device. Browsers without a built-in AAC encoder (Firefox, Linux Chrome and Edge) download one from dragbin.com once. ### Batch Friendly Queue several recordings; they're converted one at a time and can be downloaded as a zip. ### Best on a Computer Chrome, Edge and Firefox on a computer convert WebM fully. Safari support depends on the device. ## Try DragBin Today Pair private, in-browser file tools with zero-knowledge, quantum-resistant cloud storage. 5GB free, forever. [Claim 5GB free storage (opens in new tab)](https://app.dragbin.com/signup) ## Frequently Asked Questions ### Why does WebM to MP4 take longer than other conversions? WebM files hold VP9, VP8 or AV1 video and Opus or Vorbis audio. Apple devices and most editors want H.264 and AAC in an MP4, so every frame is decoded and encoded again instead of just being copied. How long that takes depends on your device and the video's length and resolution; a long recording can take several minutes. Keep the tab open until it finishes. ### Will the video lose quality? A little, as with any re-encode, but it's encoded at a high quality setting, so the difference is hard to see. The MP4 may come out larger or smaller than the WebM, depending on the content. ### Can I convert WebM to MP4 without re-encoding? Technically an MP4 can hold VP9 or AV1, but many players and editors refuse to open it, which defeats the point of converting. If you only need a different container and the file will be played in a browser or VLC, use the video converter to remux it into MKV in seconds. ### Does it work in Safari? Partly. Whether Safari can decode VP9 depends on the device, and decoding Opus audio needs Safari 26 or later. On older Safari the Opus audio is copied as it is, so QuickTime and iPhones may play the MP4 without sound. Chrome, Edge and Firefox on a computer handle WebM to MP4 fully. ### Are my WebM files uploaded? No. Everything runs inside your browser tab. Firefox, and Chrome or Edge on Linux, have no built-in AAC encoder, so there the page downloads one from dragbin.com the first time it converts audio. Only the encoder is downloaded; your videos stay on your device. More free tools ## Keep going with the DragBin toolbox [ ### Video Converter Convert between MP4, WebM, MOV and MKV in any direction. ](/tools/video-converter/)[ ### Trim Video Cut a recording down to the part you need. ](/tools/trim-video/)[ ### Send Large Files Share big videos with an end-to-end encrypted link, up to 100 GB. ](/send/) --- Canonical: https://www.dragbin.com/tools/webm-to-mp4