How to Convert MOV to MP4 (Free, In Your Browser)
Updated 2026-07-15
To convert a MOV file to MP4, open the Video Converter, drop in the MOV, choose MP4, and convert. In most cases the conversion is instant and lossless, because of a detail most converter sites never mention: MOV and MP4 are nearly the same container, and the video inside usually doesn't need to be touched at all.
Why MOV→MP4 is usually instant (remuxing, explained)
A video file is a container (MOV, MP4, MKV, WebM) wrapped around encoded streams (H.264 or HEVC video, AAC audio). When the target container supports the streams you already have, a converter only needs to re-package them — copy the compressed data into a new wrapper. That's called remuxing: no re-encoding, no quality loss, and it runs as fast as your disk.
iPhone MOV files almost always contain H.264 or HEVC video with AAC audio — exactly what MP4 holds — so MOV→MP4 is nearly always a remux. The Video Converter detects this automatically: compatible streams are copied, and only incompatible ones are re-encoded.
Step by step
- Open the Video Converter and drop in the file. You'll see the container, resolution, duration, and the exact video/audio codecs inside.
- Pick the output: MP4 for maximum compatibility, WebM for the web, MKV/MOV for editing workflows.
- (Optional) Open the advanced panel to force a re-encode, scale to 1080p/720p, or set a custom bitrate — only needed when you want to change the video itself, not just the wrapper.
- Convert, preview the result, save. A remux finishes in seconds even for large files.
The HEVC wrinkle
Newer iPhones default to HEVC (H.265), which is technically legal inside MP4 — but some older players and sites only accept H.264. If a converted file won't play somewhere, run the conversion again with force re-encode enabled: the tool decodes the HEVC and re-encodes to the target's default codec. (You can avoid the issue at the source: iPhone Settings → Camera → Formats → "Most Compatible" records H.264 directly.)
Common conversions and what to expect
- MOV → MP4 — remux, instant, lossless (the classic "my editor/site won't take MOV" fix).
- MKV → MP4 — usually a remux too, if the MKV holds H.264/AAC.
- MP4 → WebM — a real re-encode (different codec family), so it takes time proportional to length.
- Anything → smaller file — that's compression, not conversion: use the Video Compressor.
Privacy
Converter websites usually upload your video, convert it on a server, and email you a link — slow, size-capped, and your footage sits on their machines. This converter runs on WebCodecs in your browser: the file never leaves the tab, there's no size-cap queue, no watermark, and no account. Phones work too.