CloudConverterConvert MP4 to WebM to get a video format designed for the web. WebM plays in modern browsers and is a common choice for embedding video on websites.
MP4 vs WebM: what changes
MP4 is the most widely supported video format overall. WebM is an open format built for the web, and it often produces smaller files at similar quality. If your video will play on a website, WebM is a good option. For sharing with people on phones or in editors, MP4 is usually easier.
When to convert MP4 to WebM
Use it to embed video in a web page, to meet a site's WebM requirement, or to reduce file size for browser playback.
Before you convert
Not every device or editing program opens WebM, and Apple devices and older software can be limited. Keep the original MP4 for general sharing.
Tips for converting MP4 to WebM
Embed the WebM together with the original MP4 on your page, using a video element with two sources, so every browser can play it. Compare the two file sizes after converting and keep whichever suits your page.
Convert MP4 to WebM on any device
Open this page on a computer or phone, choose your MP4 and download the WebM. Web developers usually do this on a computer, then upload the file to their website or video player. WebM plays in the browser without extra software in current Chrome, Firefox and Edge.
Frequently asked questions
Is WebM smaller than MP4?
Often, at similar visual quality, but it depends on the video. Compare the file sizes after converting.
Does WebM work on iPhone?
Support has improved in recent iOS versions, but it is still less universal than MP4. If you need to share with iPhone users, MP4 is the safer choice.
Which browsers play WebM?
Current versions of Chrome, Firefox and Edge play WebM. Safari support is more recent and varies by version, so offering an MP4 version too is the safe approach.
Why would I use WebM on a website?
WebM files are often smaller than MP4, which helps pages load faster and saves bandwidth.
Can I convert a long video to WebM?
Yes, up to 200 MB per upload. Larger and longer videos take more time to process.
Is it free to convert MP4 to WebM?
Yes. It is free, with no sign-up and no watermark.
Are my files kept after conversion?
No. Uploaded files are processed and deleted after your download. We do not keep a library of your files.
Is there a file size limit?
Uploads are capped at 200 MB per file.