MOV to MP4 Converter
Convert QuickTime MOV videos into MP4 files that play everywhere. Stream-copy remux when possible (fast and lossless), automatic re-encode when not. Free, no sign-up, everything in your browser.
Powered by ffmpeg.wasm (WebAssembly). No upload, no account, no watermark.
How the MOV to MP4 converter works
MOV is Apple's QuickTime container, and MP4 is its more universal cousin. Most MOV files from iPhones, cameras and editing apps already hold H.264 or HEVC video with AAC audio, exactly what an MP4 holds. For those files this converter remuxes: the streams are copied bit-for-bit into an MP4 wrapper with no re-encoding, so the result is lossless and finishes in seconds.
Files from professional editing tools sometimes use codecs like ProRes that MP4 players, browsers and TVs cannot handle. When a plain remux is not possible, the converter automatically re-encodes the video to H.264 at CRF 23 and the audio to AAC at 192k, producing an MP4 that plays virtually anywhere. The result panel always tells you which path was used: stream copy or re-encode.
The conversion runs locally in your browser with ffmpeg.wasm, a WebAssembly build of FFmpeg. The engine (about 32MB) downloads once and is cached afterwards. Nothing is uploaded: a useful property when the footage is large or private.
Tips for best results
| Situation | What to do |
|---|---|
| MOV from an iPhone, iPad or most cameras | Nothing: these already use H.264/HEVC + AAC, so the remux path converts them losslessly in seconds |
| ProRes or other editing-codec MOV | Expect the re-encode path; the output is far smaller and plays everywhere |
| MOV will not play on Windows or Android | Convert it: the MP4 output works across devices and browsers |
| File much larger than 200MB | Remuxing large files is fine, but re-encoding them is slow on low-end devices; keep the tab in the foreground |
Frequently asked questions
Is MOV to MP4 conversion lossless?
Yes, when the stream-copy remux works, which covers most iPhone, iPad and camera MOVs because they already contain H.264 or HEVC video with AAC audio. The streams are copied unchanged into the MP4 container. Editing-codec files like ProRes are re-encoded to H.264 + AAC at CRF 23 instead, and the result panel tells you which path was used.
Why is the conversion so fast sometimes and slow other times?
Remuxing only rewrites the container, so it finishes almost instantly. Re-encoding decodes and recompresses every frame on your device's processor, which takes roughly as long as the video itself. The tool always tries the fast path first.
Why convert MOV to MP4 at all?
MP4 is the most widely supported video container: it plays natively on Windows, Android, smart TVs, browsers and messaging apps, while MOV playback outside the Apple ecosystem is hit and miss. Converting also tends to make sharing and uploading smoother.
Is there a file size limit?
There is no hard limit, but the file is processed in browser memory, so files above about 2GB will not fit. Files under about 200MB convert most comfortably; remuxing larger files usually still works, while re-encoding them can be slow.
Does my video get uploaded anywhere?
No. The converter runs entirely in your browser with ffmpeg.wasm. After the one-time engine download you can go offline and it will still work. Your file never leaves your device.