Is HEVC the reason my iPhone video won't play on Windows?

What Apple and Microsoft say

• Apple says iPhones and iPads can record video as HEVC, also called H.265, and photos as HEIF.
• Apple says you can switch an iPhone to older formats: open Settings, tap Camera, tap Formats, then tap Most Compatible. Apple says all new photos and videos then use JPEG or H.264.
• Microsoft lists an "HEVC Video Extension" among the extra codec packs you can get from the Microsoft Store. Microsoft describes it as: "Adds support for the HEVC (H.265) video format."
• Apple also says that when you import HEIF or HEVC media from an iPhone to a PC, the media might be converted to JPEG or H.264. The Keep Originals setting in Photos stops that.

What we tested

We ran our MOV to MP4 tool on a 6-second, 1080p test video that we generated ourselves. It is a .mov file of 3.1 MB with HEVC video and AAC sound. We measured each result with ffprobe and ffmpeg, and played it in Chrome 154 on Windows 10, on 2026-10-13.

• Keep original quality: a 3.1 MB MP4 in about a quarter of a second. The video was still HEVC.
• Most compatible (H.264): a 7.5 MB MP4 in about 5 seconds. The video was now H.264.
• Both files decoded without errors in ffmpeg, and both played in the Chrome we used.

So the first option only changed the file type from .mov to .mp4. The video format stayed HEVC. A player that cannot open HEVC should have the same trouble with that MP4 as with the original, although we did not test such a player. The H.264 copy avoids the problem, but it was about 2.4 times larger in our test. The ratio depends on the video.

What we did not test

The Chrome we used can play HEVC, so we could not show a playback failure ourselves. We did not test Windows Media Player, the Movies and TV app, or an Android phone, so we cannot say which of them play these files. We tested one test video, not a real iPhone recording.

What you can do

1. If you want to keep the original file, the HEVC Video Extension from the Microsoft Store is the add-on Microsoft lists for HEVC support.
2. If the video has to open on devices you do not control, make an H.264 copy with Convert MOV to MP4 and choose Most compatible (H.264). It runs in your browser, and your video is not uploaded.
3. For new videos, switch the iPhone to Most Compatible, as Apple describes above.

More plain answers are in all guides.