A YouTube Short is a vertical video up to 3 minutes long, played in a dedicated Shorts feed. The format has specific rules that decide whether a video is treated as a Short or as a regular upload, and getting these right matters because Shorts and long-form videos compete in different ranking systems.
This article covers the format requirements and the practical choices that make a Short work.
The length limit
The maximum is 3 minutes. This was raised from 60 seconds in October 2024. Anything longer is published as a standard video.
For streamers turning live moments into Shorts, the practical sweet spot is between 15 and 50 seconds. Shorter clips loop more, which YouTube counts as additional views. Longer clips need a strong hook in the first three seconds to hold attention.
If your clip is between 50 and 90 seconds, ask whether the slower second half is worth keeping. Most of the time, trimming to under 50 makes the clip stronger.
The aspect ratio
Shorts use a 9:16 vertical aspect ratio. The recommended resolution is 1080 by 1920 pixels. YouTube accepts taller content too, but the 9:16 sweet spot fills mobile screens without crops or letterboxing.
For square (1:1) or horizontal (16:9) content, YouTube may still classify it as a Short if it is under 3 minutes, but a horizontal video in the Shorts feed loses screen space and almost always underperforms a vertical one.
What triggers Short classification
A video is classified as a Short if it meets all three of these:
- Under 3 minutes
- A vertical or square aspect ratio
- Either uploaded through the Shorts camera, or uploaded as a regular video with the hashtag #Shorts in the title or description
The third point matters because a 90-second vertical video uploaded normally without #Shorts can sit in your regular video list, not the Shorts feed. Adding #Shorts is the explicit signal to YouTube that you want the Shorts ranking system applied.
Frame rate and codec
For uploads, 30 or 60 fps both work. Most stream clips are 60 fps natively, so keep them at 60. The standard H.264 codec used by every modern editor is correct.
Avoid uploading at 24 fps. The Shorts feed scrolls at variable speed and 24 fps content can stutter visibly during fast moments.
Captions and text overlays
Most Shorts are watched with sound off. Captions are not optional.
YouTube auto-generates captions, but the timing and accuracy on fast cuts are unreliable. Burn captions into the video using your editor, or use the Shorts editor's built-in text tool with positioning that does not get covered by the YouTube UI.
Avoid placing text in the bottom 15 percent or top 15 percent of the frame. The Shorts player UI sits there.
Music
The Shorts editor includes a library of licensed music you can add to any Short you create or edit in the app. Music added from the library does not trigger copyright claims.
Music in a clip from a live stream is a different matter. Twitch's Sound on Twitch system mutes music in VODs, and YouTube's Content ID still claims the audio on Shorts uploads. If your live stream included copyrighted music, mute it in the editor before posting the Short.
A title and description that help the algorithm
Shorts titles are shown briefly when the video loads. Two practical points:
- Front-load the question or hook. The first 30 to 40 characters are what people see before the title is cropped.
- Include the topic in the title or in the first line of the description. Shorts ranks partly on relevance to a search or recommendation, and the title gives YouTube the strongest hint.
A title like "How I beat the hardest boss in Elden Ring" beats "Crazy moment from last night's stream" by a wide margin in search and recommendation.
How Shorts ranking works in practice
YouTube ranks Shorts on three signals:
- Watch time as a percentage of the Short's length (a 30-second Short watched 25 seconds beats a 60-second Short watched 25 seconds)
- Loops, where the video plays through and starts again
- Swipes away in the first 3 seconds
The implication: a strong first three seconds beats a strong middle. The implication: shorter is usually better than longer for the same content.
What does not work
A few patterns that consistently underperform:
- Uploading the same clip identically to Shorts, TikTok, and Reels. Each platform tunes for slightly different patterns; a clip optimised for one often flops on the others.
- Adding a generic "follow me on Twitch" call to action at the end. Shorts watched on mobile do not click out. Put any link in the channel description.
- A 60-second Short that is really 15 seconds of content padded with 45 seconds of build-up. The completion rate kills it.
- Vertical letterboxed content (vertical video pillarboxed inside a 16:9 frame). YouTube treats this as horizontal, and it loses the Shorts boost.
A Short that does well drives more new channel discovery in 24 hours than a week of any other promotion channel.