Convert WebM to MP4 Online
WebM is an open, royalty-free multimedia container developed for the web. MP4 is a digital multimedia container that stores video, audio, subtitles, and metadata. AnyConvert converts WebM to MP4 securely without installing desktop software.
WebM to MP4 Converter
Convert your WEBM files to MP4 format quickly and easily. Upload your file and download the result.
Max file size: 50MB
Why convert WebM to MP4?
Switching from WebM helps you avoid native support on ios safari arrived only recently (14+), limiting legacy compatibility. MP4 excels at excellent compatibility with browsers, tvs, mobile devices, and ott platforms, making it a better fit when clients or platforms expect web video delivery and social media uploads.
MPEG-4 Part 14 also offers supports multiple audio tracks, subtitles, and chapter markers. That means your converted files stay useful for web video delivery and social media uploads and mobile playback and offline downloads.
WebM strengths
- Royalty-free alternative to MP4 with excellent compression efficiency
- Seamless HTML5 video integration and adaptive streaming support
- Supports alpha transparency with VP8/VP9, enabling overlay animations
MP4 advantages
- Excellent compatibility with browsers, TVs, mobile devices, and OTT platforms
- Supports multiple audio tracks, subtitles, and chapter markers
- Efficient streaming via fragmented MP4 and adaptive bitrate protocols
Key differences
| Feature | WebM | MP4 |
|---|---|---|
| Compression | Lossy | Lossy |
| Transparency / Alpha | Not applicable | Not applicable |
| Typical file size | Compact (lossy compression) | Compact (lossy compression) |
| Best suited for | Web-native video delivery through HTML5 players and Animated backgrounds and UI components requiring transparency | Web video delivery and social media uploads and Mobile playback and offline downloads |
| Standard | Open, royalty-free specification | Open, royalty-free specification |
Before you convert
- Keep a backup of your original file before converting so you can roll back if needed.
- Review known pain points: Hardware acceleration varies, impacting playback on older devices. Adjust your source file accordingly.
- Note the target resolution and frame rate to avoid unexpected stretching or stutter.
Quality tips
- Start with a high-quality setting (85–90%) and only reduce it if file size targets demand it.
- Trim clips and set the frame rate before converting to avoid double-encoding footage you do not need.
- Download the result immediately and open it in the target application to verify everything matches expectations.
Where MP4 fits best
Once you have the converted file, you can plug it straight into web video delivery and social media uploads, mobile playback and offline downloads, and archiving h.264 recordings from cameras and screen captures. MP4 is the format teams expect in those environments, so you spend less time re-exporting or explaining compatibility issues.
Common MP4 use cases
- Web video delivery and social media uploads
- Mobile playback and offline downloads
- Archiving H.264 recordings from cameras and screen captures
Tools that open MP4
- FFmpeg
- HandBrake
- Adobe Media Encoder
Frequently asked questions
Does converting WebM to MP4 reduce quality?
Yes, MP4 uses lossy compression. Start with the highest quality setting available and compare the converted file against your original. If you need a perfect copy, keep the WebM source as an archive.
How can I keep MP4 file sizes reasonable?
Trim the clip, export with a constant or target variable bitrate, and align the frame rate with your footage. Dropping unused audio tracks also saves space.
Is there a file size limit for converting WebM?
Yes—uploads up to 150 MB convert reliably in the browser. For larger assets, split them into smaller segments first so the process stays responsive.