To convert MP4 to WebM, choose your MP4 videos above, adjust the options if needed and press "Convert to WebM". The WebM downloads instantly: free, with no sign-up, and the file never leaves your device.
About the MP4 to WebM Converter
Need to turn a MP4 file into WebM? This free converter changes MP4 videos into WebM in a few seconds, right in your browser. People usually convert because sometimes you only need the audio track, a GIF or still frames from the video, while WebM gives you a royalty-free WebM for the web. WebM files open in Chrome, Firefox, Edge, Android, VLC and most editors.
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 MP4 to WebM Converter
- Click "Choose files" or drag your MP4 videos onto the box. You can add several at once.
- Choose the output resolution and quality preset.
- Press "Convert to WebM". The conversion runs on your device and shows its progress.
- Download each WebM file, or use "Download all (ZIP)" when you converted several.
- Open the result in Chrome or Firefox to check it; your original MP4 is never changed.
Tips & benchmarks
- WebM output uses VP8 video with Vorbis audio for the widest browser support; encoding is slower than MP4.
- 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 WebM to a website or government portal.
Frequently asked questions
How do I convert MP4 to WebM?
Click "Choose files", select your MP4 videos, adjust the options if you want, and press "Convert to WebM". The WebM downloads immediately; with several files you can download everything as one ZIP.
Is this MP4 to WebM 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 MP4 to WebM lose quality?
WebM is uncompressed, so no further quality is lost, although the file will be much larger than the MP4.
Can I convert several MP4 files at once?
Yes. Add as many MP4 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 MP4 and WebM?
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. WebM (WebM video) is a open web video container best suited to website background videos, HTML5 players and royalty-free publishing.
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 MP4 to WebM 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.
Does MP4 to WebM keep a transparent background?
No. WebM cannot store transparency, so transparent areas are filled with a background colour you choose (white by default). Convert to PNG or WebP if you need to keep transparency.
MP4 ko WebM kaise kare?
Is page par "Choose files" dabaiye, apni MP4 file chuniye aur "Convert to WebM" par click kijiye. WebM file turant download ho jaati hai. Ye bilkul free hai, sign-up nahi chahiye, aur aapki file kisi server par upload nahi hoti.
MP4 vs WebM: format comparison
| MP4 | WebM | |
|---|---|---|
| Full name | MPEG-4 Part 14 | WebM video |
| Type | Video container (usually H.264 + AAC) | Open web video container |
| Created by | ISO/MPEG, 2001 | Google, 2010 |
| Compression | Lossy (H.264/AAC) | Lossy (VP8/VP9/AV1 + Vorbis/Opus) |
| File extension | .mp4 | .webm |
| MIME type | video/mp4 | video/webm |
| Best for | Sharing on WhatsApp, Instagram and YouTube and playing on any device | Website background videos, HTML5 players and royalty-free publishing |
| Opens in | every phone, smart TV, browser, VLC, Windows and macOS | Chrome, Firefox, Edge, Android, VLC and most editors |
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.
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.
Need it the other way round? Use the WebM to MP4 Converter.
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