How to convert MP4 to WebM
Drop your MP4 files into the box at the top of the page, or click it to browse your files. The converter makes a copy of each one in WebM format. The conversion runs in your browser, so your videos never leave your device.
You can also choose a quality level, scale the video down to a lower resolution, and remove the audio.
Converting MP4 to WebM
MP4 is typically used for sharing and uploading video, because it plays almost everywhere, while WebM is used for videos on websites, where smaller files load faster.
What changes when I convert MP4 to WebM?
The converter re-encodes the video, which costs a small amount of detail. Choose High quality for less loss and a larger file, or Small for the opposite.
WebM files use VP9 video and Opus audio. Older versions of Safari and some TVs and editing programs cannot play them.
What are the limits when converting MP4 to WebM?
You can convert up to 10 videos a day for free, each up to 1 GB and 10 minutes long, at up to 1080p. Pro removes the daily limit and accepts videos up to 2 GB and 60 minutes long, with no resolution cap. See the plans.
Understanding MP4
MP4 is the most widely supported video format. It plays on phones, computers, TVs, browsers and social media sites, usually with H.264 video and AAC audio.
Understanding WebM
WebM is an open video format made for the web. It usually makes smaller files than MP4 at the same quality, and it plays in all modern browsers.