MP4 to WEBM

WEBM with VP9 video and Opus audio is an open format designed for the web. It is often smaller than MP4 at the same quality, which makes pages load faster. Use this converter to create WEBM versions of your videos for websites, HTML5 players and web apps.

How to convert MP4 to WEBM

1. Upload your MP4 video.
2. Choose a quality: Medium is a good balance between size and quality for websites.
3. Click Convert and download the WEBM file.

MP4 to WEBM features

• VP9 video and Opus audio, supported by all modern browsers.
• Quality levels to balance file size and sharpness.
• Resolution presets for background and hero videos.

Tip for website owners

Offer both formats in your HTML5 video tag: WEBM first and MP4 as a fallback. Browsers pick the first format they support, so most visitors get the smaller WEBM file.

Frequently asked questions

Why does MP4 to WEBM conversion take longer?

VP9 is a more complex codec than H.264, so encoding takes more time, especially for long or high-resolution videos.

Will the WEBM file be smaller?

Usually yes, at a similar visual quality. Choose a lower quality or resolution for even smaller files.

Does WEBM play on iPhone?

Recent versions of Safari support WEBM, but for the widest compatibility keep an MP4 version as well.

Is there a size limit?

Up to 500 MB per file.

Privacy, limits and file safety

Your files are processed on our own server, are never shared with anyone and are deleted automatically 60 minutes after processing. You can upload files up to 500 MB and 60 minutes long. No sign-up, no watermark and no software to install: it works in any modern browser on Windows, Mac, Android and iPhone.

Booster Tools

You Can Now Try 200+ Free Online SEO Tools to Rank on Google and YouTube