Convert iPhone screen recording to MP4
iPhone screen recordings save as .mov because iOS uses QuickTime's container. Windows Media Player, Discord's embedded player, some upload pipelines, and many smart TVs refuse .mov files. Wave rewrites the container header to MP4 without touching the video or audio streams - runs in your browser, files never uploaded.
What actually changes
The Screen Recording button in iOS Control Center (added in iOS 11, 2017) saves to the Photos app as a QuickTime .mov file. The video codec is HEVC on iPhone 8 and later in the default High Efficiency camera mode, or H.264 in Most Compatible mode; the audio codec is always AAC. All three of those codecs are natively MP4-compatible, which is why converting is a container swap rather than a re-encode.
The operation is a container swap - the technical term is "remux" (see Remux vs re-encode). Wave rewrites the header, updates the file's identifying label from QuickTime to MP4, moves the moov atom to the front so the MP4 fast-starts, and writes the same video and audio samples out to disk. No decoding, no re-encoding, no visible or measurable quality loss. On a modern laptop, a 10-minute 1080p iPhone recording converts in under 5 seconds because Wave is only rewriting bookkeeping bytes.
The reason this conversion matters is compatibility on the receiving end. Windows Media Player and the modern Films & TV app refuse .mov files entirely - Apple stopped shipping QuickTime for Windows in 2016 and Microsoft never wrote its own MOV parser. Discord's embedded video player, WhatsApp Web, LinkedIn video uploads, and many smart TV apps all show similar behaviour. If the container is HEVC-encoded, there's a second issue on Windows 10 machines - see Why iPhone HEVC won't play on Windows. Converting to MP4 with a container swap fixes the wrapper problem in seconds; re-encoding to H.264 fixes the codec problem when you need it.
For the export step out of iPhone: the Photos app's default share sheet re-encodes video to smaller sizes on the fly, which drops quality unnecessarily. Save to Files (Share sheet → Save to Files → your Files location) or AirDrop to a Mac to preserve the original file. Sending the recording via Messages or WhatsApp compresses it aggressively at the phone side and the resulting file is much lower quality than the original recording. On a 4K 60fps recording, the difference between the AirDropped original and the WhatsApp-compressed version is roughly 8x file size and clearly visible on any decent display.
Three steps.
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Step 1
Save your iPhone screen recording to Files (Share sheet → Save to Files) or AirDrop to a computer to preserve the original file.
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Step 2
Drop the .mov onto Wave. Wave confirms the fast-copy path - no re-encoding needed.
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Step 3
Convert and save the MP4. Rewriting the container takes seconds regardless of recording length.
Answers, specifically.
Why does my iPhone save recordings as .mov instead of .mp4?
iOS uses QuickTime's container as its native default; Apple's ecosystem is MOV-native. The file plays fine on Apple devices, but Windows, Discord, and many other platforms refuse .mov. Converting to MP4 wraps the same bytes in a container everything can open.
Can Windows play iPhone screen recordings without converting?
Not out of the box. Windows Media Player and Films & TV both refuse .mov files. Third-party VLC opens them, but that requires an install. Converting to MP4 is the reliable fix - the H.264 or HEVC stream inside plays natively in every Windows video pipeline once wrapped in MP4.
Will HEVC video keep playing after the conversion?
Yes. The MP4 wraps the same HEVC bitstream. Windows viewers may need the HEVC Video Extensions app (free with OEM Win 10, $0.99 retail; Windows 11 ships it with the OS). Every modern Mac, iPhone, iPad, Android device, and browser decodes HEVC-in-MP4 natively without extra install.
The recording is huge - can I compress it?
Convert to MP4 first (fast, no quality loss), then compress the MP4 separately. A dedicated compression tool is on the Wave roadmap. Until then, HandBrake with its Fast 1080p30 preset gives a good quality-to-size trade-off for casual sharing.
What's the max recording length iPhone allows?
No hard time limit; recording continues until storage fills or you tap stop. Long sessions routinely produce files above 4 GB. Wave handles up to 8 GB per file - the ceiling is your browser's RAM and disk speed for the container rewrite, not a Wave limit.
How do I include app audio but not room audio?
Long-press the Screen Recording button in Control Center before starting, and toggle the microphone off. Sound from apps (Safari playback, YouTube in-app, game audio) still records because that's routed through the OS audio graph, not the mic; the ambient room audio is what gets excluded.
Why is my converted MP4 the same size as the .mov?
Because the video and audio bytes are copied through untouched. Only the container header changes. Expect the MP4 to be within a few kilobytes of the .mov - the difference is the ftyp header, the fast-start moov relocation, and a few housekeeping atoms. That's exactly what you want: no quality loss and no time spent decoding.