How to convert mov to mp4 in your browser
- Step 1Drop the source video — Pick your output container and codec
- Step 2Select output format and codec — JAD uses WebCodecs for HW-accelerated paths or FFmpeg for the rest
- Step 3Download the converted file — Stream the result directly to disk
Frequently asked questions
Should I use H.264 or H.265 for output?+
H.264 (AVC) offers universal compatibility — it plays on virtually every device, browser, and platform without issues. H.265 (HEVC) provides roughly 50% better compression at the same quality, making files significantly smaller. Use H.264 when compatibility is the priority (email, social upload, sharing). Use H.265 when storage efficiency matters (archive, delivery to known H.265-capable devices).
Why does browser transcoding take longer than HandBrake?+
HandBrake runs natively compiled binaries and can leverage hardware encoding (NVENC, QuickSync, VideoToolbox). JAD's transcoder runs FFmpeg compiled to WebAssembly — a portable format that runs in the browser sandbox without hardware GPU access. Transcoding speed is typically 30–60% of native, depending on your CPU. For long files (over 30 minutes), a native tool may be faster. For short clips and convenience, browser processing is practical.
How do I convert a MOV file from iPhone to MP4?+
Drop the MOV file, select MP4 as the output container, choose H.264 as the video codec, and AAC for audio. This produces a universally compatible MP4. If the iPhone MOV uses HEVC (common on newer models), you may also select H.265 output for a smaller file. The conversion runs entirely in your browser in 30–120 seconds depending on clip length.
Privacy first
All video processing runs locally in your browser using WebAssembly and FFmpeg. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.