YouTube Shorts can be square or vertical and up to three minutes long. For a native full-screen composition, 9:16 on a 1080 by 1920 canvas remains the practical start, and neither that ratio nor that resolution is a requirement.
Last verified: July 29, 2026. YouTube changes Shorts classification, upload workflows and presentation; check the current official requirements before an important campaign.
What actually classifies as a Short
For standard channels: square or vertical videos uploaded on or after October 15, 2024, lasting no more than three minutes. That sentence retires two stubborn myths at once: the exactly-9:16 myth (1080 by 1080 and 1080 by 1350 qualify too) and the 60-second myth (three minutes is the current line). Aspect ratio, resolution and duration are three separate tests; a video can pass two and fail the third.
Horizontal is the real boundary: the current guidance calls for square or vertical, so a brief landscape clip does not become a Short by being brief. Recompose it for a vertical or square canvas first.
Uploading, from both doors
From a computer, YouTube Studio accepts a square or vertical file up to three minutes as a Short, and currently allows selecting up to fifteen short files in one upload action; batch selection is not batch approval, so each Short still gets its own title, audience setting, rights review and publish decision. From the phone, the app trims longer sources to three minutes and offers text, filters and music; anything added in-app changes the safe composition and the rights status, so it re-enters the review.
Two presentation rules from YouTube itself: the player adapts to the video's ratio, so do not embed padding, and YouTube specifically advises against black bars on vertical video. An automatic empty bar is not a designed composition.
Thumbnails and rights, the two Shorts quirks
The thumbnail comes from choosing a frame in the YouTube app; per YouTube's documentation, Shorts thumbnail editing is not available through Studio. So pick deliberately: representative, readable small, no blur, no half-blink.
The rights quirk bites harder: an active Content ID claim on a Short longer than one minute can block the Short globally until the claim is resolved. That does not prohibit longer Shorts; it makes the pre-publish rights review (music, footage, fragments, client assets, background audio) non-optional, and a track tolerated on another platform proves nothing about YouTube.
Composing for the Shorts feed
The familiar vertical craft applies: talking heads leave room for captions and interface, products keep the demonstrated part in frame, screen recordings crop to one readable step. Caption positions do not copy blindly from TikTok or Reels; the Shorts interface stacks differently, so check placements against the actual feed.
Where ReadyForm fits
ReadyForm turns the takes into a complete edit in your chosen square or vertical frame, captions composed inside it, ready for either upload door. The YouTube-specific steps stay yours: the rights review, the thumbnail pick in the app, and the check that the upload registered as a Short. See the Shorts editor page or how the edit is made.