Free Online Video Converter – No Upload
Convert MOV, MKV, AVI, WebM, WMV and more to MP4 locally in your browser — your video never leaves your device
Drop in almost any video and get back a standard MP4 that plays everywhere. Unlike other online converters there is no upload: the conversion runs in your own browser with WebAssembly FFmpeg, so a multi-gigabyte file starts converting instantly.
Videos that already contain H.264 are rewrapped without re-encoding (lossless, seconds). Everything else — HEVC, VP8/VP9, AV1, MPEG-4, WMV and more — is re-encoded to H.264 with AAC audio for maximum compatibility.
How to convert video to MP4
- Choose or drag in your video file — nothing is uploaded, it stays on your device.
- Click Start. H.264 sources are rewrapped losslessly in seconds; other codecs are re-encoded to H.264 in your browser.
- Download your MP4.
Frequently asked questions
Which input formats are supported?
MP4, MOV, MKV, WebM, AVI and WMV containers, with H.264, HEVC, VP8, VP9, AV1, MPEG-2, MPEG-4 and WMV/VC-1 video. Output is always MP4 (H.264/AAC).
Is my video uploaded to a server?
No. The conversion runs entirely in your browser using WebAssembly (FFmpeg). Your file never leaves your device — that is also why there is no upload wait, no queue and no file-size pricing.
What is the maximum file size?
Up to 8GB on desktop browsers and 2GB on mobile. There is no limit on the number of files you convert, and no signup or watermark.