Ask ten creators how long a Short should be and you will get ten answers, from fifteen seconds to three minutes. The honest answer is that there is no single best length, because viewers do not judge length. They judge whether the clip earns its next second. A fifteen-second clip that drags feels long; a ninety-second clip that keeps paying off feels short. The right length is the shortest length that lets one idea land completely. Here is how to find it before you cut.
The short answer: match the length to the idea
Think in idea sizes, not in seconds. A quick tip is one sentence of advice, and fits in 15 to 30 seconds. One complete idea, a claim plus the reason behind it, needs 30 to 60 seconds. A story with a setup, a turn, and a payoff can run 60 to 90 seconds. Anything longer usually holds two ideas, and two ideas belong in two clips. YouTube Shorts allows up to 3 minutes and TikTok allows much longer uploads, but the feed still rewards clips that finish what they start. Start by naming the idea in one sentence. If you cannot, the clip has a focus problem, not a length problem.
15 to 30 seconds: one quick win
The shortest useful Short does one thing: it gives the viewer something to use in the next minute. A setting to change, a mistake to avoid, a shortcut to try. Cut everything before the point and everything after it. The hook is the first line, not a warm-up: say the payoff first, then show it. If the clip needs a second point to feel complete, it is not a 15-second clip; let it grow instead of squeezing two points into one.
30 to 60 seconds: one complete idea
This is the workhorse length, and it fits most repurposed clips. Sixty seconds is enough for a claim, one reason, and one example. Open with the claim in the first three seconds, give the reason or the proof in the middle, and close with the takeaway the viewer can repeat. Watch the middle: if the clip sags, it is usually because the example runs long or the speaker repeats the claim. Cut the repeat, keep the example short, and the clip will feel faster without losing anything. Most clips ViralSplice surfaces land in this range, because most strong moments are one idea, fully made.
60 to 90 seconds: stories and explanations
Some moments need a story: a setup, a turn, and a payoff. A before-and-after, a mistake and the fix, a question and the answer that surprised you. These clips can run to 90 seconds, but they earn every second with a turn the viewer did not see coming. If there is no turn, there is no story, and the clip should be shorter. Keep the captions moving and cut any sentence that restates the last one; at this length, a repeat is the fastest way to lose a viewer. One story per clip, and if a second story starts, save it for the next Short.
How to find your length before you post
When you pick a clip, ask three questions. First, can I say the point in one sentence? Second, does the clip end the moment the point lands, or does it keep talking? Third, would I watch it again if I had not made it? Trim to the answer, then watch it once on your phone with the sound off. If the captions carry the point and it lands inside the time you planned, the length is right. If you check the progress bar halfway through, it is too long. Post one clip a day at the length its idea needs, and note which lengths hold viewers. After a few weeks you will see your own pattern, and that pattern is worth more than any general rule.
Turn your next long video into clips cut to the right length at slice.coderao.com, free with five jobs a day and no account needed to start.