Convert MOV to MP4
(No Quality Loss)

A .mov file is a QuickTime video, the format Apple devices record by default. An .mp4 holds the same kind of video but in the container the rest of the world expects. That difference is why a clip that plays perfectly on your iPhone or Mac gets refused by a Windows media player, an Android phone, a TV, a projector at work, or an upload form that only accepts MP4.

The important part: this is a rewrap, not a re-encode

Most online converters decode your video frame by frame and encode it again from scratch. That takes minutes, heats up your machine, and throws away real picture quality every time, because the video gets compressed a second time on top of compression it already went through.

None of that is necessary here, and understanding why explains the whole page. MOV and MP4 are not really different video formats. Both are built on the same underlying structure (ISO Base Media File Format), and the video inside a .mov from a phone, a camera or a screen recorder is almost always H.264 or HEVC, with AAC audio. Those are exactly what an .mp4 contains.

So the picture and sound data are already correct. Only the wrapper around them is wrong. This tool rewrites that wrapper and copies the media through untouched, byte for byte. The result is:

• No quality loss at all. Not "barely noticeable" loss. The video and audio in the file you download are bit for bit the same as the ones you started with.
• Speed limited only by your disk. Converting is essentially copying. A 4 GB recording finishes in about the time your machine takes to copy 4 GB, rather than the ten or twenty minutes a re-encode would need.
• No size ceiling. The file is read in pieces and written in pieces, so memory use stays flat whether the video is 40 MB or 40 GB.

Your video also starts playing sooner afterwards

Video files keep an index describing where every frame lives. Cameras and phones normally write that index at the end of the file, because they only know the final layout once recording stops. A player therefore has to reach the end of the file before it can show you anything, which is why a large video streamed over a slow connection can sit black for a long time.

The MP4 written here moves that index to the front, the arrangement usually called "fast start". If you later upload the result to a website or a media server, it begins playing while it is still downloading instead of after.

When a .mov genuinely cannot become an .mp4

Because this copies the media rather than converting it, it can only rewrap video that MP4 is able to carry. Two cases from professional workflows cannot be rewrapped:

• Apple ProRes, common in footage exported from Final Cut Pro or Premiere, and recorded by professional cameras. MP4 has no way to store it.
• Uncompressed PCM audio, which QuickTime allows and MP4 does not.

If you drop one of these in, the page tells you which codec it found and why it stopped, rather than handing you a file that looks fine and then plays as a black screen. Converting those genuinely requires re-encoding. Anything recorded by a phone, a screen recorder, a webcam or a consumer camera will be H.264 or HEVC and will rewrap without trouble.

Why the file size barely changes

People sometimes expect an MP4 to come out much smaller. It will not, and that is the point. The output is within a few kilobytes of the input because the video data is identical, and only the container changed. If you want a genuinely smaller file you need to re-encode at a lower bitrate, which is a different operation and does cost quality.

Nothing is uploaded

The conversion runs inside your own browser tab. Your file is read from your disk, converted by code already running on your machine, and written straight back out. It is never sent to a server, which means there is no queue to wait in, no upload progress bar, no account, no watermark, and nothing of yours sitting on someone else's hard drive afterwards. You can disconnect from the internet after the page loads and it will still work.