Does YouTube Shorts support MKV files?
an open container that can hold multiple audio/subtitle tracks, common for downloaded or archived video
MKV is absent from YouTube's published upload-format list.
The current list includes MOV, MP4, AVI and WebM, but does not name MKV. We have no independently recorded upload test establishing MKV support. Export to a listed format when you need a documented upload path.
Convert MKV to MP4 →Source: YouTube supported file formats. YouTube video uploads; Shorts also requires an eligible shape and duration. Checked 2026-09-12.
Frequently asked
Does YouTube Shorts support MKV?
MKV is absent from YouTube's published upload-format list. The current list includes MOV, MP4, AVI and WebM, but does not name MKV. We have no independently recorded upload test establishing MKV support. Export to a listed format when you need a documented upload path.
What format should I convert MKV to for YouTube Shorts?
MP4 - a widely supported video container; acceptance also depends on the video and audio codecs inside it. Converting MKV to MP4 runs entirely in your browser with the converter linked below.
How do I check whether my MKV file will upload cleanly to YouTube Shorts?
Open the Koldflux File Doctor, drop in the file, and pick YouTube Shorts. It reads the container, codec, resolution, duration and file size locally and reports pass / warn / fail against the documented YouTube Shorts constraints.