Turn your MP4 videos into WebM, right in your browser — no upload, no signup.
MP4 to WebM Converter turns your .mp4 clips into the WebM format websites love — it's the format built for the modern web, playing natively in every major browser without a plugin and usually landing at a smaller file size for the same look. It's a great fit before embedding a video on a website or web app, where every extra megabyte slows the page down. Add your MP4 files, click convert, and download a .webm ready to embed — everything happens right here in your browser, so your footage is never sent to a server.
Drag and drop your .mp4 files, or click to browse. You can add several at once.
Click Convert and a progress bar shows you how it's going. This one always needs a full re-encode, so it can take a few minutes for a longer clip.
Save each .webm file individually, or download every converted file at once as a .zip.
Your videos are processed locally and never leave your device.
Works straight in your browser — no software, no account, no email.
WebM is the format modern browsers were made for — no plugins, no compatibility guessing.
Convert as many videos as you like, with no limits or hidden fees.
Turn your WebM videos into MP4, right in your browser — no upload, no signup.
Change your video's format in seconds, right in your browser — no upload, no signup.
Shrink MP4 videos in seconds, right in your browser — no upload, no signup.
Shrink WebM videos in seconds, right in your browser — no upload, no signup.