To convert WebM to MP4, choose your WebM videos above, adjust the options if needed and press "Convert to MP4". The MP4 downloads instantly: free, with no sign-up, and the file never leaves your device.
About the WebM to MP4 Converter
Need to turn a WebM file into MP4? This free converter changes WebM videos into MP4 in a few seconds, right in your browser. People usually convert because iPhones, WhatsApp and many video editors handle WebM poorly, while MP4 gives you an MP4 that plays on every device. MP4 files open in every phone, smart TV, browser, VLC, Windows and macOS.
Audio and video are processed by FFmpeg compiled to WebAssembly, the same open-source engine behind VLC and HandBrake, running inside your browser tab. Because everything happens on your own device, your videos are never uploaded, stored or seen by anyone else, which makes it safe for family videos, client footage and private recordings.
What to expect: the resolution is kept unless you choose a smaller size, and the audio track is converted too; the processing engine (about 30 MB) is downloaded once and then cached by your browser.
How to use the WebM to MP4 Converter
- Click "Choose files" or drag your WebM videos onto the box. You can add several at once.
- Choose the output resolution and quality preset.
- Press "Convert to MP4". The conversion runs on your device and shows its progress.
- Download each MP4 file, or use "Download all (ZIP)" when you converted several.
- Open the result in every phone or smart TV to check it; your original WebM is never changed.
Tips & benchmarks
- The MP4 uses H.264 video and AAC audio, the combination every phone, TV and social network accepts.
- Very large videos (over about 1 GB) may exceed the memory of a phone browser; trim them first with our Trim Video tool.
- Keep the file name simple (letters, numbers and hyphens) if you plan to upload the MP4 to a website or government portal.
Frequently asked questions
How do I convert WebM to MP4?
Click "Choose files", select your WebM videos, adjust the options if you want, and press "Convert to MP4". The MP4 downloads immediately; with several files you can download everything as one ZIP.
Is this WebM to MP4 converter free and safe?
Yes. It is completely free, with no sign-up, no daily limit and no watermark. The conversion runs inside your browser, so your videos never leave your phone or computer and nothing is stored on News Appite's servers.
Does converting WebM to MP4 lose quality?
MP4 is uncompressed, so no further quality is lost, although the file will be much larger than the WebM.
Can I convert several WebM files at once?
Yes. Add as many WebM files as you like; they are converted one after another and you can download them individually or together as a ZIP.
Does it work on iPhone, Android and Mac?
Yes. The converter works in any modern browser, including Chrome, Safari, Edge and Firefox, on Android, iPhone, iPad, Windows, macOS and Linux. No app is needed. The audio and video engine is a larger download the first time, so Wi-Fi is recommended.
What is the difference between WebM and MP4?
WebM (WebM video) is a open web video container best suited to website background videos, HTML5 players and royalty-free publishing. MP4 (MPEG-4 Part 14) is a video container (usually H.264 + AAC) best suited to sharing on WhatsApp, Instagram and YouTube and playing on any device.
Is there a file size limit?
There is no upload limit, because nothing is uploaded. The practical limit is your device's memory: files of a few hundred megabytes work on most computers, and phones handle smaller files comfortably.
How do I convert WebM to MP4 without losing quality?
Keep the resolution on "Keep original" and choose the "High" quality preset. When the source is already H.264, MOV and M4V files are re-packaged without re-encoding, which is completely lossless.
How do I convert WebM to MP4 on Android or mobile?
Open this page in Chrome, tap "Choose files", select the WebM from your gallery or file manager and tap "Convert to MP4". The converted file is saved in the Downloads folder, ready to share on WhatsApp or upload.
How do I convert WebM to MP4 on a Mac?
Open this page in Safari or Chrome, drop the WebM files onto the upload box and click "Convert to MP4". It works the same on Intel and Apple silicon Macs.
WebM ko MP4 kaise kare?
Is page par "Choose files" dabaiye, apni WebM file chuniye aur "Convert to MP4" par click kijiye. MP4 file turant download ho jaati hai. Ye bilkul free hai, sign-up nahi chahiye, aur aapki file kisi server par upload nahi hoti.
WebM vs MP4: format comparison
| WebM | MP4 | |
|---|---|---|
| Full name | WebM video | MPEG-4 Part 14 |
| Type | Open web video container | Video container (usually H.264 + AAC) |
| Created by | Google, 2010 | ISO/MPEG, 2001 |
| Compression | Lossy (VP8/VP9/AV1 + Vorbis/Opus) | Lossy (H.264/AAC) |
| File extension | .webm | .mp4 |
| MIME type | video/webm | video/mp4 |
| Best for | Website background videos, HTML5 players and royalty-free publishing | Sharing on WhatsApp, Instagram and YouTube and playing on any device |
| Opens in | Chrome, Firefox, Edge, Android, VLC and most editors | every phone, smart TV, browser, VLC, Windows and macOS |
What is a WebM file?
WebM is Google's royalty-free video format for the web, based on Matroska and using VP8, VP9 or AV1 video. Browsers play it natively and screen recorders often save WebM files.
What is a MP4 file?
MP4 is the most compatible video format in the world, normally carrying H.264 video and AAC audio. It plays on every phone, TV, browser and social network, from WhatsApp to YouTube and Instagram.
Need it the other way round? Use the MP4 to WebM Converter.
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All tools on News Appite are free to use for personal and commercial work. Calculations and file conversions are performed in your browser; the redirect and cache checkers make a single request to the URL you enter and store nothing. Found a bug or want a new tool? Tell us.