Online Video Converter
Convert video files between MP4, WebM, MKV and MOV directly in your browser. 100% free with no upload — your videos never leave your device. Choose a conversion to get started.
MP4 → WebM
MP4 → MKV
MP4 → MOV
WebM → MP4
WebM → MKV
WebM → MOV
MKV → MP4
MKV → WebM
MKV → MOV
MOV → MP4
MOV → WebM
MOV → MKV
Free online video converter — no upload required
This online video converter changes your video format entirely inside the browser. Pick a conversion such as MP4 to WebM or MOV to MP4, drop in your file, and download the result — nothing is uploaded to a server, so even large videos convert quickly and stay completely private.
It supports the most common web and editing formats — MP4, WebM, MKV and MOV — in every direction. Conversion runs on the WebCodecs API with hardware acceleration where your browser supports it, so re-encoding is fast and there are no file-size limits, watermarks, or sign-ups.
Because everything happens on your device, this is a safe way to change video format for uploading to social platforms, embedding on a website, or editing in a specific app. For the widest compatibility, use a Chromium-based browser such as Chrome or Edge 94+.
Frequently asked questions
- Is this online video converter free?
- Yes. It is completely free with no limit on the number of files, no watermark, and no sign-up required.
- Are my videos uploaded to a server?
- No. The conversion runs entirely in your browser using the WebCodecs API, so your video never leaves your device and stays private.
- Which formats can I convert?
- You can convert between MP4, WebM, MKV and MOV in any direction — for example MP4 to WebM, WebM to MP4, or MOV to MP4.
- Is there a file size limit?
- There is no fixed limit. Because processing is local, the practical limit depends on your device's memory rather than an upload cap.
- Which browser works best?
- A Chromium-based browser such as Chrome or Edge 94+ gives the widest format support and hardware acceleration. Safari 16.4+ works for many conversions too.
