Convert video to MP4, MOV, MKV, or WebM
Change any video's format right in your browser. Compatible files are repackaged in seconds with zero quality loss.
Free · No signup · Files never leave your device
Drag and drop a video file
or click to browse
Compatible videos are repackaged in seconds without re-encoding — you'll see whether yours qualifies before converting.
How it works
Drop your video
Any common format — MP4, MOV, MKV, WebM, AVI, and more. It stays on your device.
Pick a target format
The tool checks your file's codecs and tells you upfront whether the conversion is an instant repackage or a re-encode.
Download the result
Preview the converted video and download it — free, no watermark.
Why video formats matter
A video file is really two things: compressed video and audio streams, and a container (MP4, MOV, MKV, WebM) that wraps them. Compatibility problems are almost always about the container or the codec inside it — an editor that refuses MKV, a phone that won't play WebM, a website that only accepts MP4. Converting fixes that, and most of the time it doesn't require touching the video data at all: when the target container accepts your file's streams, they are simply repackaged in seconds with zero quality loss.
Typical jobs this converter handles: OBS screen recordings (MKV) into MP4s an editor accepts, iPhone MOV clips into MP4s for Windows users, downloaded WebM clips into something a TV plays, and old AVI or WMV archives into a modern format. The tool probes your file when you select it and tells you before converting whether it's an instant repackage or a re-encode.
Which format should you choose?
MP4 with H.264 is the universal answer — every device, browser, editor, and platform made in the last decade plays it. Choose MOV for Apple-centric editing workflows, MKV for archiving and media servers like Plex or Jellyfin (it holds anything, including multiple audio tracks), and WebM when a website or web app specifically asks for it. If you're unsure, pick MP4.
Frequently asked questions
Yes. The converter is completely free, with no signup, watermarks, or limits. We make money from our video translation service, not from this tool.
No. The conversion happens locally in your browser using WebAssembly. Your file never leaves your device — you can even disconnect from the internet once the page has loaded.
A video file is a container (MP4, MKV, ...) holding compressed video and audio streams. When the target container accepts your file's streams, they're simply repackaged — no quality loss, done in seconds. When it doesn't (like VP9 video into MP4), the video must be re-encoded, which runs at roughly the video's length in your browser. The tool tells you which case applies before you start.
Repackaged conversions are bit-for-bit lossless. Re-encoded conversions use a high-quality setting that is visually indistinguishable for most footage.
MP4 plays everywhere and is the safe default. MOV suits Apple editing workflows, MKV is best for archiving and media servers, and WebM is the open format for web embedding.