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Drag & drop your MP4 file or click the + button to upload it; 
Wait a few seconds while our tool converts your video; 
Download your WebM file. It’s also saved to your account. 
MP4 is the most common video format, but it doesn’t always play smoothly on websites. WebM is a lightweight, open format built specifically for the web, and every modern browser supports it out of the box. When you need to change MP4 to WebM, our converter does the work for you. Simply upload your file, and the conversion starts automatically. You can also turn MP4 into WebM whenever you need a smaller file for email, social media, or your own site. The whole process takes seconds and requires zero technical knowledge.
An MP4 to WebM converter takes your video and re-encodes it from the MP4 format into WebM, a lighter format designed for the web. MP4 files typically use H.264 for video and AAC for audio, while WebM uses VP8 or VP9 for video and Vorbis or Opus for audio. Our online MP4 to WebM converter handles this entire process automatically, so you don’t need any technical knowledge to get a web-ready video file.
Scroll to the top of this page and drag your MP4 file into the upload area, or click the + button to select it from your device. Our tool will process the video and deliver a finished WebM file automatically. Once the conversion is complete, you can download it right away or access it later from your PDF Guru account.
In most cases, yes. WebM uses more efficient compression, which means it can deliver similar visual quality at a lower file size. This is convenient when you need to embed a video on a website or share clips without eating up storage or bandwidth. The exact size difference depends on the length, resolution, and content of your source video.
It depends on what you need. WebM is an open, royalty-free format designed for web streaming and HTML5 video, and it plays natively in Chrome, Firefox, Edge, and Safari. MP4 is more widely supported across devices, media players, and social media platforms. If you’re publishing a video on a website, WebM is usually the better pick. For everything else, MP4 is the safer all-around choice.
Yes. Our converter keeps both the video and audio tracks during MP4 to WebM conversion. The audio is re-encoded into a codec that WebM supports (Vorbis or Opus), and for the vast majority of files, the difference in quality is imperceptible. Even if your original has a high bitrate audio track, the change after re-encoding is minimal and won’t affect normal listening.
All major modern web browsers can play WebM videos natively: Google Chrome, Mozilla Firefox, Microsoft Edge, Opera, and Safari (starting with macOS Big Sur and iOS 15). This means your WebM videos will work directly on any modern website without requiring plugins or additional software from the viewer.
Yes. Our converter maintains the original resolution and aspect ratio of your source video by default. The output file will match the dimensions of your MP4, so you don’t need to worry about losing sharpness or unexpected cropping.
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