Glossary
What is short-form video?
By the KeyMo team · Updated
Short-form video is video made for fast, swipeable feeds such as YouTube Shorts, Instagram Reels, Facebook Reels and TikTok. It is usually vertical and runs from a few seconds to a few minutes. No platform sets one official length, so the label describes the feed more than the clock.
Short-form video, defined by the feed
Nobody publishes a single rule that says a video is short-form below some number of seconds. What the apps publish are upload limits and categories. A video is short-form because it lives in a feed where people swipe from one clip to the next, usually on a phone held upright, and decide in the first moments whether to stay.
That is why the same recording can be long-form on one app and short-form on another.
What each app says about length
| App | Length statement | Source page |
|---|---|---|
| YouTube Shorts | Up to 3 minutes. Since 15 October 2024, square or vertical videos of up to 3 minutes on standard channels are categorised as Shorts | YouTube Help |
| Instagram Reels | The help centre says up to 20 minutes; Meta's ad specs and API show 15. Reels over 3 minutes are not recommended to new audiences | Instagram Help, Instagram for Creators |
| Facebook Reels | No minimum or maximum length, and any orientation | Meta Business Help |
| TikTok | TikTok Studio on desktop accepts uploads up to 60 minutes; we could not read the in-app limit | TikTok Creator Academy |
Read the Instagram row twice. The ceiling is generous, but the recommendation to unconnected audiences is 3 minutes or less. The limit says what you may upload, and the recommendation says what has a chance of travelling.
Why long recordings get cut into it
A podcast or interview is built for someone who chose to sit down with it. A feed audience did not choose you yet. A clip pulls one moment out of the recording, so a stranger can get the point without the first 40 minutes of context. That moment is often the strongest hook in the episode, and the rest of the recording is where people go if they want more.
Cutting also means reformatting. Most feeds expect vertical video, so a 16:9 recording has to be reframed, not just trimmed.
Worked example: a 60-minute episode
KeyMo takes a video of 5 minutes to 3 hours and returns up to 15 vertical clips of 15 to 90 seconds in Auto length. Its built-in target for a source up to 60 minutes is 8 to 12 clips. That is a target, not a promise: each clip gets a score out of 10 with a one-line reason, and only clips scoring 7 or higher are kept.
- Source: one 60-minute interview.
- Target: 8 to 12 clips of 15 to 90 seconds.
- Result: every clip fits inside the 3-minute Shorts limit and the 3-minute Reels recommendation, with room to spare.
Common mistakes
- Treating short-form as 'long video, but shorter'. A clip needs its own opening, not the middle of a sentence.
- Posting a 16:9 clip into a vertical feed and leaving black bars.
- Designing around one app's limit. Check each app's own page before you batch a week of uploads.
- Ignoring sound-off viewing. Some viewers watch on mute, so captions matter.
Sources: YouTube Help: Shorts overview (checked 11 October 2026); YouTube Help: Shorts categorisation and length (checked 11 October 2026); Instagram Help: Record a reel (checked 11 October 2026); Instagram for Creators: FAQ (checked 11 October 2026); Meta Business Help: Facebook Reels (checked 11 October 2026); TikTok Creator Academy (checked 11 October 2026).