Convert MOV to MP4
Drop a .mov from an iPhone, a Mac screen recording or a camera and get an .mp4 that opens on Windows, Android and every website. Most files convert in seconds with no quality loss because only the container changes. Nothing is uploaded.
Runs in your browser with ffmpeg. The file is never uploaded.
About the mov to mp4
MOV and MP4 are close relatives: both are based on the same QuickTime container design, and an iPhone .mov usually holds exactly the H.264 or HEVC video and AAC audio that an .mp4 would. The reason a .mov will not open on a Windows PC or upload to some sites is the wrapper, not the content. So the fastest correct conversion is a remux: copy the streams untouched into an MP4 container, which takes seconds and loses nothing. That is what this tool does first. When the MOV holds something MP4 cannot carry, like ProRes from a camera or an editing export, or an old codec, the remux fails and the tool automatically falls back to re-encoding the video to H.264 with AAC audio, which plays everywhere at the cost of a longer wait. You can also force the re-encode from the start when you need maximum compatibility, for example when an HEVC iPhone recording has to play on an older Windows machine without the HEVC extension. The rotation metadata that iPhones write is preserved either way, so portrait videos stay portrait. Everything runs in the browser with ffmpeg compiled to WebAssembly, so a 400MB 4K clip converts without an upload.
How it works
Drop your video
MP4, MOV, WebM or MKV, up to 500MB. It is processed in your browser with ffmpeg, nothing is uploaded anywhere.
Pick the settings
Times, quality, size or speed depending on the tool. A progress bar shows how far along the export is.
Download
The result saves to your device. Free, no watermark, no signup.
Tips for best results
Things that meaningfully improve the output.
Let it remux
The default tries a lossless container swap first. For iPhone and Mac screen recordings that is nearly always enough, and it finishes in seconds.
Force H.264 for old Windows PCs
iPhones record HEVC by default. An HEVC .mp4 still will not play on Windows 10 without the paid extension. Pick "re-encode to H.264" if the recipient is on an older PC.
Check the size, not just the extension
A remux keeps the same size. If you also need the file smaller, run the result through the video compressor.
Stop the problem at the source
On iPhone, Settings > Camera > Formats > Most Compatible records H.264 in the first place; the files are still .mov but re-encode is never needed.
Need more than mov to mp4?
renza turns photos into video with Kling, Veo and Seedance, and upscales footage to 4K. Free credits at signup, no credit card.
Create free account →Frequently asked questions
Does converting MOV to MP4 lose quality?
Not when the tool can remux, which is the case for nearly all iPhone and Mac files: the video data is copied byte for byte. Only the fallback re-encode changes the pixels, at a high quality setting.
Why did my conversion take longer than expected?
The MOV held a codec MP4 cannot carry, so the tool re-encoded it. ProRes and other editing formats always take this path.
Is my file uploaded?
No. ffmpeg runs inside your browser as WebAssembly and the file never leaves your device.
Will the MP4 play on Windows and Android?
Yes for H.264 content. HEVC MP4s need the HEVC codec on Windows 10 and older Android; choose the re-encode option for those.
Does it keep portrait orientation?
Yes. The rotation tag from the phone is preserved, and the re-encode path bakes the rotation in.