MP4 to MOV Converter

Repackage an MP4 into a QuickTime .mov for Apple apps — fast and lossless. Runs on your device; nothing is uploaded.

By LK Forge · Published 6 August 2026 ·

Drop your file here, or click to choose Processed privately in your browser — nothing is uploaded

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100% private. Your file is processed in your browser with ffmpeg (WebAssembly) and is never uploaded. Big or long files take longer and use more memory — for those, trim first.

Is converting MP4 to MOV lossless?

MP4 to MOV is a remux, not a re-encode. MP4 (ISO/IEC 14496-14) was standardised in 2001 from Apple's QuickTime File Format, so both containers share the same atom-based structure and carry the same H.264 video and AAC audio streams. This tool runs ffmpeg with -c copy, which lifts the already-encoded streams out of the MP4 and writes them into a .mov container untouched: nothing is decoded, nothing is re-encoded, there is no generation loss, and the picture is identical to the source. Because the work is effectively a copy rather than an encode, it finishes far faster than a re-encode of the same file would. Use it when QuickTime Player, Final Cut Pro, iMovie or Keynote expects a .mov. If your MP4 holds a codec MOV cannot carry, convert it to standard H.264/AAC first. Everything runs locally through ffmpeg.wasm, so nothing is uploaded; the engine itself downloads once per session, on your first conversion.

How to Use the MP4 to MOV Converter

Three steps, all in your browser.

  1. Load your MP4

    Drag an .mp4 onto the box or click to choose one.

  2. Convert to MOV

    Click Convert. Because MP4 and MOV share the same H.264/AAC streams, the tool copies them straight across — fast and with no quality loss.

  3. Download the MOV

    Preview and download the .mov, ready for QuickTime, Final Cut, iMovie and Keynote.

What does a remux actually change, and when will Apple still reject the file?

This tool runs a stream copy — the same bytes, in a different wrapper.

The H.264 video and AAC audio are lifted out of the MP4 and written into a QuickTime container untouched. That is possible because MP4 is a direct descendant of QuickTime: ISO standardised Apple’s QuickTime File Format as the ISO base media file format, so both files are built from the same nested boxes.

PropertyMP4 inMOV outChanged?
Video codecH.264H.264No
Audio codecAACAACNo
Bitrate and file sizeAs sourceAs sourceNo
Resolution and frame rateAs sourceAs sourceNo
Picture qualityAs sourceIdentical, bit for bitNo
Container brand (ftyp)isom / mp42qtYes
Processing time—Seconds, at any lengthYes
moov atom positionOften at the frontAt the endYes

Which means a remux cannot fix a decoding problem. If your MP4 holds AV1 video or Opus audio — increasingly common in files pulled from the web — the copy will succeed and produce a valid .mov that QuickTime Player still refuses to open, because the container was never what was wrong.

It also cannot make the file edit-friendly. H.264 is a long-GOP codec: most frames are reconstructed from their neighbours, so every scrub in Final Cut or Premiere forces a partial decode. Remuxing to .mov changes none of that — if timeline performance is the goal, the target is an intra-frame codec like ProRes 422, and that needs a real transcode. Finally, this remux passes no faststart flag, so the index sits at the end of the file: irrelevant for opening locally in QuickTime, iMovie or Keynote, and it matters only if you intend to stream the .mov from a web server. For the reverse direction, MOV to MP4 re-encodes rather than copies.

Frequently Asked Questions

How do I convert MP4 to MOV?
Load your .mp4 file and click Convert. Because an MP4 usually already contains H.264 video and AAC audio — the same streams a MOV uses — the tool remuxes them into a QuickTime container without re-encoding, so it’s fast and lossless. Then preview and download the .mov.
Why convert MP4 to MOV?
Some Apple applications — QuickTime Player, Final Cut Pro, iMovie and Keynote — prefer or expect the .mov container. Converting lets an MP4 drop into those apps cleanly while keeping the exact same video and audio quality. The tool copies the streams with ffmpeg rather than re-encoding them.
Does converting reduce quality?
No — converting to MOV does not reduce quality. This conversion is a remux: the video and audio are copied from the MP4 into the MOV container untouched, so there is no re-encoding and no generation loss. The picture and sound are identical to the source.
Is my file uploaded to a server?
No — your MP4 never leaves your browser. The remux runs entirely on your device with ffmpeg compiled to WebAssembly, so the video is never uploaded, stored or logged. The video engine (about 10 MB) downloads the first time you convert in a session; after that, no further network requests are made.
What if my MP4 uses an unusual codec?
The fast copy works when the MP4 holds standard H.264/AAC, which is by far the most common case. If you have an unusual codec that a MOV can’t hold, convert it to a standard MP4 first, then to MOV. The WebM to MP4 and MKV to MP4 tools both output H.264 with AAC, which remuxes cleanly.

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