MP4 to WebM
Convert MP4 video to open WebM format with VP8, VP9, or AV1 video and Opus or Vorbis audio.
No watermarkFree & unlimited
Processed on our servers and deleted right after. Never stored or shared.
About this tool
- 1
Upload your MP4
Select the MP4 video file you want to convert to WebM format.
- 2
Adjust quality settings
Set the target bitrate or quality level to balance size and visual fidelity.
- 3
Start conversion
The tool transcodes the MP4 video using VP9 codec into a WebM container.
- 4
Download WebM
Save the converted WebM file, optimized for web use.
- WebM files are typically 30-50% smaller than MP4 at comparable visual quality, ideal for web delivery.
- For HTML5 video, serve WebM to Chrome/Firefox and keep the MP4 as a Safari fallback.
- Conversion speed depends on video length - expect roughly 1-3x real-time processing.
- Use a lower CRF value (higher quality) for videos with lots of motion or fine detail.
- Direct MP4 to WebM format conversion
- VP9 video codec with Opus audio
- Configurable quality and bitrate controls
- Maintains original resolution and frame rate
- Optimized output for web streaming and embedding
- Optimize MP4 videos for embedding on web pages with smaller file sizes
- Create WebM versions for dual-format HTML5 video delivery
- Reduce bandwidth costs by serving more efficient WebM to supported browsers
- Convert video assets for open-source and royalty-free format workflows
WebM uses VP9 codec which offers better compression than H.264, resulting in smaller files. It is also royalty-free and optimized for web delivery.
Any transcoding involves some generation loss. Set a high quality/bitrate to minimize it. The difference is usually imperceptible at reasonable settings.
VP9 encoding is slower than H.264. Expect conversion to take 2-5x the video duration depending on settings and your device performance.