WebM Video Won't Play on Your Device?
You downloaded a video from the web and it's in WebM format. Now your iPhone won't play it, Windows Media Player doesn't recognize it, and you can't upload it to Instagram. WebM works great in browsers but falls apart everywhere else.
Converting to MP4 takes seconds and unlocks universal playback. MP4 is the standard video format that works on every phone, computer, TV, and social media platform in existence.
How to Convert WebM to MP4
- Upload your WebM file – Drag and drop or click to select your video
- Confirm MP4 output – MP4 with H.264 encoding ensures maximum compatibility
- Download your video – Ready to play on any device or upload anywhere
No software to install, no account required. Convert directly in your browser and download immediately.
WebM vs MP4: Why Compatibility Matters
WebM was created by Google specifically for web browsers. It uses VP8 or VP9 video codecs with Vorbis or Opus audio. The format is royalty-free and produces smaller files, which is why YouTube and many websites use it.
The problem? WebM support outside browsers is limited:
- iPhones and iPads – No native WebM support in iOS
- Windows Media Player – Requires codec installation
- Adobe Premiere, Final Cut – Limited or no WebM editing support
- Instagram, TikTok, Facebook – Many platforms reject WebM uploads
- Smart TVs – Inconsistent WebM playback
MP4 with H.264 is the universal standard. It plays natively on every device and platform without extra software or codecs.
When You Need This Conversion
Saving Web Videos
Downloaded a video from a website and it saved as WebM? Convert to MP4 so you can watch it on your phone, TV, or tablet without compatibility issues.
Video Editing
Your video editor doesn't recognize WebM files? MP4 works in Adobe Premiere, Final Cut Pro, DaVinci Resolve, iMovie, and virtually every editing application.
Social Media Uploads
Trying to post a video to Instagram, TikTok, or Facebook? These platforms prefer MP4. Converting ensures smooth uploads without rejection errors.
Sharing with Others
Sending a video to someone who isn't tech-savvy? MP4 will play on their device without them needing to install anything or troubleshoot codecs.
Quality and File Size
WebM often produces smaller files than MP4 at similar quality due to VP9 codec efficiency. When converting to MP4, file size may increase slightly, but you gain universal compatibility.
We use optimized H.264 encoding that balances quality and file size:
- Video quality – Preserved with high-quality H.264 encoding
- Audio quality – Converted to AAC, the standard MP4 audio codec
- Resolution – Maintained from your original WebM file
- File size – Typically 10-20% larger than WebM (worth it for compatibility)
When to Keep WebM
WebM isn't always the wrong choice. Keep the original format when:
- Embedding on websites – WebM is ideal for HTML5 video with smaller file sizes
- Viewing in Chrome, Firefox, or Edge – These browsers play WebM natively
- File size is critical – WebM offers better compression for the same quality
Convert to MP4 when you need the video outside a web browser context.
Convert Multiple WebM Files
Have several WebM videos to convert? Upload them all at once. Our batch conversion handles multiple files simultaneously, saving you time when processing entire folders of web-downloaded videos.
Works on Any Device
Convert WebM to MP4 directly in your browser:
- Windows, Mac, Linux, Chromebook
- Chrome, Firefox, Safari, Edge
- iPhone, iPad, Android
No downloads, no installations. The conversion happens right in your browser.