Convert WEBM to MP4
Convert WEBM files to MP4 locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
Upload FilesPlatform Statistics
How to convert WEBM to MP4
- Drop your .webm files above, or click Upload Files. You can add many files at once.
- MP4 is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .mp4 files as soon as each one finishes.
What to know about WEBM to MP4 conversion
- The video is re-encoded to H.264 video and AAC audio so it plays wherever MP4 is supported, and odd frame sizes are adjusted automatically.
- You can change the resolution, frame rate, playback speed and quality (CRF) before converting.
WEBM vs MP4
| Feature | WEBM (WebM Video Container) | MP4 (MPEG-4 Part 14) |
|---|---|---|
| Codecs used by PureConverter | VP8 video and Opus audio | H.264 video and AAC audio |
| Best for | web video with open, royalty-free codecs | sharing and streaming video on any device |
| Opens in | all modern browsers and VLC | every browser, phone, TV and media player |
WEBM (WebM Video Container): An open, royalty-free media file format designed for sharing video content directly on HTML5 web pages.
MP4 (MPEG-4 Part 14): A widely compatible digital multimedia container format, most commonly used to store video and audio.
Conversion options
- Resolution: original, 1080p, 720p, 480p or 360p
- Frame rate and playback speed (0.5× to 2×)
- Quality presets or a custom CRF value, and lossless mode
- Audio bitrate, sample rate and channels
Frequently asked questions
Is it safe to convert WEBM to MP4 here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several WEBM files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert MP4 to WEBM.
Convert WEBM to other formats
- WEBM to MP3
- WEBM to WEBP
- WEBM to GIF
- WEBM to WAV
- WEBM to MOV
- WEBM to M4A
- WEBM to FLAC
- WEBM to MKV
- WEBM to AAC
- WEBM to OGG
- WEBM to OPUS
- WEBM to AVI
Convert other formats to MP4
- MOV to MP4
- MKV to MP4
- AVI to MP4
- WMV to MP4
- FLV to MP4
- M4V to MP4
- MPEG to MP4
- TS to MP4
- 3GP to MP4
- OGV to MP4
See every WEBM converter and MP4 converter, or browse the full converter directory.