How to convert MOV to MP4 on an iPhone without a computer

iOS has no built-in video converter. iMovie can export a clip, but it re-encodes everything it touches, and renaming a file in the Files app changes the label without changing a single byte inside it. To convert on the phone itself you need an on-device converter app.

The browser converter on this site is the alternative, but only for short clips: mobile Safari gives a tab far less memory than a desktop browser does, and reclaims it without warning. Anything long or in 4K will outlive the tab.

Does the iPhone have a video converter already?

Not in the sense you mean. There is no Apple app whose job is to take a .mov and hand you back an .mp4. What iOS actually has is three near-misses, and it is worth knowing why each one falls short before you install anything.

iMovie. It will happily import your clip and let you share it out as H.264, which is the right codec. The cost is that iMovie renders a timeline: every frame is decoded and compressed again, so the picture is re-compressed even though nothing about it needed changing. On a long 4K clip that is a slow, lossy round trip for a problem that was only ever about the wrapper.

The Shortcuts app. Its Encode Media action is the closest thing to a converter Apple ships, and almost nobody finds it. It genuinely re-encodes video on-device and can save the result to Files. Its limits are the same as iMovie's: it always re-encodes, it gives you no readout of what codec you started with, and the file it hands back is not always named the way you expect. Check the extension on the result before you send it anywhere.

Renaming in Files. This one is the internet's favourite bad advice. Changing clip.mov to clip.mp4 edits the file name and nothing else. Sometimes it appears to work, because many players sniff the contents and ignore the extension entirely. Then you hand the file to something strict — an editor, a smart TV, PowerPoint — and it reads the container's identifying brand near the start of the file, sees QuickTime where it expected MP4, and refuses. You have moved the failure later instead of fixing it, which is worse. Videos still sitting in Photos cannot be renamed at all.

What actually needs to change in the file

MOV and MP4 are close relatives. Both are ISO base-media containers, built from the same nested boxes, and both can hold H.264 or HEVC video with AAC audio. What differs is the brand stamped in the header and a handful of QuickTime-specific structures Apple uses. The video stream inside your iPhone recording is, in the overwhelming majority of cases, already exactly what an MP4 is allowed to contain.

That has a consequence most articles about this never mention: converting MOV to MP4 usually does not require re-compressing anything. The streams can be lifted out and dropped into an MP4 wrapper untouched — a remux, or stream copy. It takes seconds regardless of the clip's length and the result is bit-for-bit identical to the original. The long, lossy version of this job is only needed when the codec has to change too. There is a fuller explanation in the guide on converting MOV to MP4 without losing quality.

So before you convert, find out what you have. In Photos, open the clip and swipe up on it: the info panel names the codec. Two outcomes:

• H.264 in a .mov. Only the wrapper is wrong. A copy fixes it completely.
• HEVC in a .mov. Your Camera is set to High Efficiency. HEVC is legal inside an MP4, so this can still be remuxed — but if the destination is an older Windows PC, the codec is the thing that will fail there, not the container. That case is covered in why HEVC video will not play on Windows 11, and the same mismatch is behind iPhone video refusing to play on Android.

Option one: a converter app on the phone

This is the option that works without a computer, on any length of clip, with no browser to run out of memory. Our own Video Converter app for iPhone converts between MP4, MOV, AVI, MKV and 3GP, imports straight from the camera roll or Files, keeps a history of what you have converted, and sends the result out through the normal share sheet. It needs iOS 15.1 or later.

The reason a native app beats a browser here is the encoder. The app drives VideoToolbox, the iPhone's hardware video encoder, rather than a software one — that is the difference between a long 4K clip being practical and being an afternoon. It also has no file-size ceiling, and it works in airplane mode, because nothing is uploaded.

Two things to be straight about. First, the app always re-encodes. Every phone converter does; there is no stream-copy mode, so a MOV to MP4 conversion through the app is a fresh compression at your chosen quality — Low, Medium or High, which are roughly 1, 2.5 and 5 Mb/s — not the untouched copy described above. Second, on iPhone the first conversion is free and further conversions need the paid upgrade. On Android the same app is unlimited and free.

Option two: the browser tool, for short clips

The MOV to MP4 converter on this site runs FFmpeg compiled to WebAssembly inside your own tab. Nothing is uploaded, there is no server, and once the page has loaded it keeps working with the network off. It is also the only option here that will copy your streams instead of re-encoding them, and it tells you in words which of the two it is about to do before you press Convert.

On an iPhone, use it with your eyes open:

• A converter needs roughly three times the file size in free memory. iOS is aggressive about reclaiming memory from a background or busy tab, so a big job can simply vanish mid-convert.
• Files over 2 GB are refused outright — a 32-bit WebAssembly heap cannot address them. Above about 300 MB the page warns you before it starts.
• Keep the tab in the foreground and the screen awake for the whole conversion.
• Getting the file into Safari means saving it out of Photos to Files first, which is an extra step the app does not have.

For a phone clip of a minute or two that only needs remuxing, this is genuinely the fastest route on the device: a copy finishes in seconds and loses nothing. For a twenty-minute 4K recording, use the app.

Stop the problem happening again

If you are converting iPhone footage regularly for the same destination, change what the camera records instead of fixing every file afterwards.

Open Settings → Camera → Formats and choose Most Compatible. The Camera then records H.264 with AAC audio rather than HEVC. The container is still .mov — Apple does not offer a choice there — but the codec inside is the universally supported one, which means every later conversion is a pure container swap rather than a re-encode, and a lot of destinations stop complaining at all.

The trade is real: H.264 files are noticeably larger than HEVC for the same footage, and High Efficiency is required for some capture modes. Switch back when you have finished with whatever needed the compatibility.

Which option fits your clip

iPad, and a few loose ends

Everything above applies unchanged on an iPad. The Camera formats setting is in the same place, the app runs on iPadOS, and the browser tool behaves the same way in Safari — with more headroom on newer iPads, though the 2 GB ceiling still stands.

Subtitle and extra audio tracks are dropped. Both the app and the browser tool keep only the first video and first audio stream. Phone recordings have exactly one of each, so this rarely matters here, but it does if you are converting a downloaded film.

DRM-protected video cannot be converted by anything, on any platform. If the file came from a streaming service, no converter will open it.

If the destination is a Windows PC and you want to understand what will greet the file when it arrives, the guide on why a MOV file will not play on Windows covers which players handle QuickTime natively and which do not. And if you are unsure what any file on your phone actually contains, you can check a video's codec in the browser without installing anything — it reads the header locally and reports the container, codec, resolution, frame rate and audio before you commit to converting.