Turn a QuickTime MOV into a widely compatible MP4. When the source is H.264, Justvert remuxes the streams instead of re-encoding them.
or choose a file from your device
Every file is inspected by the Media Analyzer, then the Strategy Engine picks COPY REMUX, WebCodecs or FFmpeg WASM. Compatible H.264 streams are copied. Hardware-friendly transcodes use the GPU. Legacy containers fall back to FFmpeg.
Turn a QuickTime MOV into a widely compatible MP4. When the source is H.264, Justvert remuxes the streams instead of re-encoding them.
No editing timeline, complicated settings or software installation. Just choose a file, select a format and convert.
Add a video from your device. Justvert can identify common video and audio formats automatically.
Choose MP4 for compatibility, MP3 for audio, WebM for the web, or another format suited to your workflow.
Start the conversion, then save the finished file when it is ready. Processing stays in the browser.
Stay on the same job, or jump to a nearby format change.
Open the MOV to MP4 converter, drop your MOV file, confirm the output is MP4, then choose Convert. Justvert processes the file in your browser and offers a download when it is ready.
No. This MOV to MP4 conversion runs in the browser. There is nothing to download or install.
No. Conversion runs locally in your browser. The chosen file is read on the page, processed by remux, WebCodecs or FFmpeg WASM, then written back with a WritableStream or a download. Source files are not uploaded to a Justvert conversion server.
It can, if the file has to be re-encoded. Compatible H.264 plus AAC streams can be remuxed into MP4 without touching the pictures or the sound. WebCodecs and FFmpeg paths re-encode and may introduce some quality loss depending on the source and output size.
There is no fixed Justvert upload cap because files stay on your device. Very large files are limited by the memory available to the browser. If a conversion runs out of memory, try a shorter clip or a smaller output size such as 720p or 480p.
Not on the remux path. If the MOV already contains H.264 video, Justvert copies the streams into an MP4 container. Other codecs fall back to WebCodecs or FFmpeg and may re-encode.
Yes. Many iPhone camera clips are MOV or MP4 with H.264 or HEVC. H.264 sources remux quickly. HEVC sources use a transcode path so the result plays in more players.