How to convert HEVC MOV videos to MP4 locally
Convert a short SDR HEVC recording to H.264 MP4 in your browser, without uploading the video.
A recording can play on an iPhone yet fail to open in another app. Sometimes the issue is the video codec inside the file. TinyModel's MOV to MP4 converts short SDR HEVC recordings to H.264 MP4 on your device. This first version accepts HEVC video in MOV or MP4 files, not every possible MOV codec.
MOV and MP4 are containers, HEVC and H.264 are codecs
The container holds video, sound, and metadata. The codec determines how the picture is compressed. Renaming recording.mov to recording.mp4 does not change its codec and will not solve a missing HEVC decoder.
HEVC is also called H.265. It is an industry standard used by Apple and other manufacturers, not an Apple-only format. Apple describes H.264 as the more compatible recording option in its HEIF and HEVC guide. This tool re-encodes HEVC to H.264 and puts the result in an MP4 container, with AAC audio when an audio track is present.
Choose a short SDR recording
Open MOV to MP4 and select one MOV or MP4 file. The limits are 100 MB and three minutes. The tool checks the actual video stream after the conversion engine starts, rather than trusting the filename.
HDR, Dolby Vision, BT.2020 color, and non-square-pixel recordings are not supported in this version. An HDR recording needs color conversion as well as a new codec. The tool rejects it instead of silently exporting a faded or incorrectly colored picture. Export a square-pixel SDR version first if needed.
If the original cannot play in the preview, you can still try conversion: the software decoder does not depend on native HEVC playback support. Browser memory and WebAssembly support still determine whether conversion can finish.
Convert on your device
Select Convert to MP4. On first use, the browser downloads approximately 32 MB of fixed-version FFmpeg engine assets from jsDelivr. Their SHA-256 checksums are verified before execution. The file itself is not uploaded.
Keep the tab open. Software conversion can take longer than the recording's duration, especially on phones. Use Cancel processing to stop the worker; your chosen file remains available for another attempt. If a download fails, retry while connected. There is no cloud conversion fallback.
The output fits within 1920 × 1080 for landscape video or 1080 × 1920 for portrait video, without enlarging smaller recordings. High frame rates are reduced to 30 fps. Rotation is applied to the picture. Only the main video and first audio track are exported; extra tracks, chapters, and source location metadata are not retained.
Review and download
Play the result and check the picture, orientation, and sound. The tool uses lossy H.264 encoding, so the output is not an archival copy. H.264 can require more space than HEVC; conversion is not a promise of a smaller file.
For example, a landscape 3840 × 2160, 60 fps source is targeted to 1920 × 1080, 30 fps. A 1280 × 720, 24 fps source keeps its dimensions and does not need a frame-rate reduction. These describe conversion settings, not device performance benchmarks.
Select Download MP4 before closing the workspace. Keep your original if you need full resolution, HDR, multiple tracks, or the original metadata.
What stays in the browser
Public engine files may be cached to avoid another download. Once the engine is cached, conversion can work without a connection on an already-open tool page. This does not make the whole site an offline application.
Your video and converted result remain in the current workspace and are not saved as a site history. Clear conversion engine cache removes cached public processing assets. Download providers receive normal connection information, such as IP address and requested asset, but not your video or its filename. See the privacy policy for details.