How to Convert MP4 to WebM Online
Follow these three simple steps to convert MP4 to WebM. No software installation required. Free and secure.
Select an MP4 Video
Choose the MP4 video you want to prepare as a WebM asset for a website or browser-based application.
Choose Video and Audio Settings
Keep the original resolution and frame rate or choose new values, then keep the automatic audio settings or select a sample rate and mono or stereo output.
Convert and Download
Start the conversion, review the original and output file sizes, and download the completed WebM video.
How Does the MP4 to WebM Converter Work?
The CompressFly MP4 to WebM converter decodes the MP4 source, re-encodes supported video as VP8 and available audio as Vorbis, and stores the result in a WebM container. This produces a browser-oriented copy without changing the original MP4.
Conversion runs directly in your browser. Your MP4 video is not uploaded to a server, and the completed WebM file downloads from the browser to your device.
What "directly in your browser" means
- Your MP4 video is not uploaded to a server.
- Video conversion runs locally on your device.
- The completed WebM video downloads directly from your browser.
When to Convert MP4 to WebM
Create a WebM version when a website, web application, or delivery specification requests that container and codec combination.
Prepare Video for a Website
Convert an MP4 asset when your site implementation or publishing workflow expects WebM video.
Provide an Alternate Web Source
Create a WebM version alongside the original MP4 when a project supplies more than one browser playback source.
Meet a WebM Requirement
Deliver VP8 video with Vorbis audio for a tool, web app, or recipient that explicitly requests WebM.
Related Video Tools
MP4 to WebM Converter FAQ
How do I convert MP4 to WebM online?
Use this online MP4 to WebM converter in three steps: 1. Select an MP4 video from your device. 2. Keep or change the available video and audio settings. 3. Start the conversion and download the completed WebM video.
What happens when I convert MP4 to WebM?
The converter re-encodes MP4 video as VP8 and available audio as Vorbis, then saves the streams in a WebM container.
Why convert MP4 to WebM?
WebM is designed for web media workflows. Use it when your website or browser-based application requests WebM, and keep the original MP4 when you also need broad compatibility outside the browser.
Can I change the video resolution and frame rate?
Yes. Keep the source resolution and frame rate or select an available output resolution and frame rate before conversion.
Is the MP4 to WebM converter free?
Yes. Convert MP4 to WebM for free with no registration or credit card required.
Is there a file size limit, and is my video uploaded?
Your video is processed locally in your browser and is not uploaded to a server, so there is no server upload limit. The practical limit depends on your device's available memory and processing power, as well as the video's duration and resolution.