Support

MKV, WebM, AVI, WMV, FLV, 3GP, MOV, TS, M2TS, MTS, MPG/MPEG, M2V and VOB. The result is always an MP4 file. Chapters are kept.

MP4 and M4V files that Apple devices can already play aren’t converted again — they just get a title, description and artwork. MOV files are repackaged as MP4.

Usually not. Convertag keeps H.264 and HEVC video as it is, and the same goes for AAC, Dolby Digital and Dolby Digital Plus audio. That often takes no longer than copying the file.

Only what Apple devices can’t play gets converted — such as AV1, VP9, MPEG-2 or VC-1 video and DTS, TrueHD or FLAC audio. The app shows what happens to each track beforehand.

HDR10 and HLG are kept. Dolby Vision profiles 5 and 8 are kept as well; older devices show them as HDR10. For profile 7 (from UHD Blu-rays) Convertag keeps the HDR10 base and drops the Dolby Vision layer.

Dolby Digital Plus audio with Atmos stays untouched. Atmos in TrueHD can’t be carried over into MP4: the audio becomes Dolby Digital Plus 5.1, and Atmos and 7.1 are lost. The app tells you beforehand.

Blu-ray (PGS), DVD (VobSub) and DVB store subtitles as images, which MP4 doesn’t support. Convertag reads them with macOS text recognition — entirely on your Mac — and puts them into the MP4 as text subtitles. This takes about 1 to 3 minutes per track and can be turned off in Settings.

Teletext subtitles from DVB recordings aren’t supported.

Put it next to the video with the same name and Convertag picks it up automatically — .ass, .ssa and .vtt too. The app reads language and type from the name, for example Film.en.srt, Film.en.forced.srt or Film.en.sdh.srt.

Click “Other Match” and pick the right one from the list, or search yourself with “Search for Another Title …” — ideally with the year, for example “The Godfather 1972”. “Continue without info” converts without title and artwork.

A file name with title and year helps, and for TV shows season and episode (S01E03).

No. Convertag finds info and artwork through a built-in service with data from OMDb and Wikidata. If you have your own free key from The Movie Database (TMDb), you can add it under Settings → Info; Convertag then asks TMDb first.

Add a folder under Settings → Folders. Convertag converts new videos in it as soon as the file has stopped growing for 10 seconds — that is, once it has finished copying. Videos that arrived while the app was closed are found on the next launch.

To have this work without an open window, turn on “Start at login”. Convertag then runs in the background and shows up in the menu bar.

You decide: ask, keep it or move it to the Trash. Convertag never deletes anything for good, and the original only goes to the Trash once the new MP4 is finished.

Apps from the Mac App Store may only access files you give them. If you drag a video into the window, Convertag may read just that one file. To save the MP4 next to it or find subtitle files, the app asks once for the folder and remembers the permission.

A Mac with Apple silicon (M1 or later) and macOS 14 Sonoma or later. Intel Macs aren’t supported.