Convert MP4 to WebM Online
Free, easy-to-use MP4 to WebM converter. Optimize your videos for the web with this open and efficient format.
MP4 to WebM Converter
Convert your MP4 files to WEBM format quickly and easily. Upload your file and download the result.
Max file size: 50MB
Why Convert MP4 to WebM?
WebM is an open-source video format specifically designed for the web. It uses modern video codecs (VP8 or VP9) that offer excellent compression while maintaining quality, making it ideal for websites, online platforms, and HTML5 video content. Converting MP4 to WebM can significantly reduce file size while keeping good visual quality, which helps with faster loading times and reduced bandwidth usage.
Benefits of Converting MP4 to WebM
- Smaller file sizes - WebM typically provides better compression than MP4 with H.264.
- Open format - WebM is royalty-free and open-source, with no licensing fees.
- Web optimization - Designed specifically for HTML5 video playback.
- Wide browser support - Supported in Chrome, Firefox, Opera, and Edge.
- Efficient streaming - Good performance even on slower connections.
How to Convert MP4 to WebM Using Our Tool
- Upload your MP4 video file using the upload button or drag and drop functionality.
- Our converter will automatically select WebM as the output format.
- Solve the simple captcha to verify you're human.
- Click "Convert MP4 to WebM" to start the conversion process.
- Once conversion is complete, download your new WebM file.
About MP4 and WebM Format Differences
| Feature | MP4 | WebM |
|---|---|---|
| Video Codec | Typically H.264/AVC | VP8 or VP9 |
| Audio Codec | AAC or MP3 | Vorbis or Opus |
| File Size | Larger | Smaller (typically) |
| Licensing | Proprietary codecs | Open-source |
| Device Support | Excellent | Good (mainly web-focused) |
When converting MP4 to WebM, the video needs to be re-encoded from the original codec (typically H.264) to either VP8 or VP9. Similarly, the audio is usually converted from AAC to either Vorbis or Opus. This transcoding process allows the resulting WebM file to take advantage of these modern codecs' superior compression algorithms.
The quality and file size of your WebM output can vary based on the encoding settings. Our converter balances quality and compression to give you a WebM file that's significantly smaller than the original MP4 while maintaining good visual quality. For web video embedding, WebM is often used alongside MP4 in HTML5 video tags to ensure maximum compatibility across all browsers.
Other Video Conversion Options
Frequently Asked Questions
How much smaller will my WebM file be compared to the original MP4?
WebM files are typically 30-50% smaller than equivalent MP4 files when using the VP9 codec, though the exact reduction depends on the content of your video and its original encoding. Videos with lots of motion may see less dramatic size reductions, while simpler content like presentations or screencasts might see even greater compression benefits. Our converter uses optimal settings to balance quality and file size.
Will all browsers support my WebM video?
Most modern browsers including Chrome, Firefox, Opera, and Edge support WebM natively. However, Safari has limited WebM support (only in newer versions), and some older browsers don't support it at all. For maximum compatibility on websites, it's good practice to provide both WebM and MP4 versions using the HTML5 video tag with multiple sources, allowing browsers to choose the format they support.
Is there quality loss when converting from MP4 to WebM?
Some quality loss is inevitable in any video conversion that involves re-encoding, including MP4 to WebM. However, the VP8/VP9 codecs used in WebM are very efficient, and our converter is optimized to maintain good visual quality. For most web usage scenarios, the quality difference is minimal or imperceptible, while the file size benefits are substantial. If you need absolute highest quality, you might want to use a higher bitrate setting in a dedicated video encoding application.