The short answer: aim for 20–30 seconds on TikTok and Instagram Reels, 40–50 seconds on YouTube Shorts, and 15–30 seconds on X. Maximums in 2026 are much higher than most guides say — Shorts now allows 3 minutes, Reels 3 minutes, TikTok 10 minutes — but the ceiling is not the target. The number that decides whether your video gets pushed is average percentage viewed, so the right length is the longest one your material can hold attention through, and not a second more. Use the calculator below for a per-platform, per-format starting point, then let your retention graph move it.
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Pick a target length for any platform, convert a script into runtime, and check every platform's current maximum. Free, instant, no sign-up.
Writing to a target duration? Convert a word count into runtime, and see how many words fit a 15, 30, 45, 60 or 90-second cut.
Add roughly 10% if your delivery uses deliberate pauses, and subtract time for anything you show rather than say.
| Platform | Min Length | Working Range | Sweet Spot | Hook Window |
|---|---|---|---|---|
| YouTube Shorts | 15s | 30–50s | 40–50s | First 2s |
| TikTok | 15s | 21–34s | 25–32s | First 1–2s |
| Instagram Reels | 5s | 15–30s | 20–28s | First 1s |
| X (Twitter) | 5s | 15–45s | 20–35s | First 2s, plus the post text |
| Facebook Reels | 5s | 15–45s | 20–30s | First 2s |
| Snapchat Spotlight | 5s | 10–30s | 15–25s | First 1s |
| 10s | 30–90s | 45–60s | First 3s, plus the caption |
Sweet spots are starting points drawn from how each platform's ranking behaves, not guarantees. Your own retention graph beats any table on this page.
Most length guides still quote a 60-second Shorts cap and a 90-second Reels cap. Both are out of date. These are the published limits at the time of writing — and they move, so re-check before you build a workflow around a ceiling.
| Platform | Maximum Length | Worth Knowing |
|---|---|---|
| YouTube Shorts | 3 minutes | Raised from 60 seconds. Any vertical upload at or under 3:00 is treated as a Short. |
| YouTube (standard upload) | 12 hours | Verified accounts only; 256 GB file cap. Unverified accounts are limited to 15 minutes. |
| TikTok | 10 minutes | In-app recording and uploads. Longer formats have appeared in tests but 10 minutes is the reliable ceiling. |
| Instagram Reels | 3 minutes | Raised from 90 seconds, but shorter Reels still get the widest distribution. |
| Facebook Reels | 90 seconds | Shorter cap than Instagram, so a Reel that fits IG may not cross-post cleanly. |
| Snapchat Spotlight | 60 seconds | The tightest of the major short-form surfaces. Cut for Spotlight first and everything else fits. |
| X (Twitter) | 2:20 free | Paid Premium tiers allow dramatically longer uploads. |
| 10 minutes | Long ceiling, short attention. Most B2B clips still land best under 60 seconds. | |
| Twitch clips | 60 seconds | Capped at the source, which is why Twitch clips need no trimming for Shorts or Reels. |
Paste a YouTube URL and ClipSpeedAI finds the moments, cuts them on sentence boundaries so nothing ends mid-thought, and scores each clip 0–100. Free on videos under 30 minutes (demo clips are watermarked), then $1 for 3 days of full Pro.
Try ClipSpeedAI for $1Video duration is one of the most critical factors determining whether your short-form content performs well or gets buried in the algorithm. Every platform has its own preferences for clip length, and getting it wrong can tank your watch-through rate, which directly impacts how many people the algorithm shows your video to.
The reason length matters so much comes down to one metric: average percentage viewed. A 20-second video that people watch to the end signals to the algorithm that the content is engaging. A 60-second video where viewers drop off at 15 seconds tells the algorithm to stop pushing it. This is why shorter is not always better, and longer is not always worse. The goal is to match your content length to the attention span your content type naturally commands.
YouTube Shorts now allows up to 3 minutes, but the extra ceiling changed almost nothing about what performs. Clips in the 40-50 second range still tend to do best: long enough to deliver a complete thought and a narrative arc, short enough to keep watch-through high. Gaming highlights and podcast clips sit comfortably there because viewers expect a complete moment. Tutorials should aim shorter (30-40s) since viewers want the answer, not the build-up. Treat the 3-minute cap as headroom for the rare clip that genuinely earns it, not as a target — and if you want the length broken down by niche and goal rather than by content type, use our dedicated YouTube Shorts length calculator.
TikTok's algorithm is famously aggressive about rewarding high completion rates. Videos in the 25-32 second range hit the sweet spot where content feels complete without overstaying its welcome. Comedy clips can go shorter (15-22s) since the punchline is the payoff. Motivation and fitness content can stretch to 40+ seconds because viewers are willing to watch longer for the transformation or result.
Reels favor brevity. The 20-28 second range consistently outperforms longer content on Instagram, even though the cap is now 3 minutes rather than the 90 seconds most guides still quote. The platform's user base scrolls quickly, so you need to hook them instantly and deliver value fast. Cooking content and tutorials can push to 45-60 seconds if the visual payoff is strong, but most content types perform best under 30 seconds. One cross-posting trap: Facebook Reels still caps at 90 seconds, so a Reel built to Instagram's ceiling will not carry over.
Video on X works differently because it lives alongside text. The ideal length depends heavily on whether your video can stand alone or needs the tweet copy for context. Pure entertainment clips work best at 15-25 seconds. Commentary and news clips can stretch to 45 seconds because the audience on X is more willing to engage with longer-form analysis.
There are two calculators on this page and they answer different questions. The first takes your target platform and content type and returns a recommended duration range plus format-specific notes — use it when you already have footage and need to know where to cut. The second converts a script word count into runtime at your speaking pace — use it when you are writing to a target length and need to know whether 200 words will fit in 60 seconds. (It will not: 200 words is about 80 seconds at a conversational pace.)
Treat both as starting points, then let your own analytics move the number. If viewers drop off before the end, trim. If your completion rate is pinned near 100%, you have room to say more. And if you are cutting from long-form rather than writing to length, an AI Shorts maker will pick the in and out points for you and keep them on sentence boundaries, which matters more for retention than hitting an exact second count.
Regardless of platform, the first 2 seconds are make-or-break. Front-load your hook — if your clip starts slow, no amount of perfect length optimization will save it, which is the whole argument in our guide to what the first second of a video actually does to retention. The second universal rule: end strong. A satisfying ending encourages replays, which every algorithm counts as additional engagement. Finally, test multiple lengths from the same source video rather than committing to a house style.
Two other settings quietly cost more views than duration does. The first is aspect ratio: a 9:16 clip that was letterboxed from 16:9 wastes a third of the screen on black bars, and our aspect ratio calculator works out the crop for you. The second is where you cut, not how long you cut for — a 30-second clip that ends mid-sentence performs worse than a 40-second clip that lands a complete thought, so trim to the sentence boundary before you trim to a target duration.
For short-form, exactly as long as your best material and not one second longer. As a starting point: 20-30 seconds on TikTok and Reels, 40-50 seconds on YouTube Shorts, 15-30 seconds on X. Those are opening bids, not rules. The metric that decides whether a video gets pushed is average percentage viewed, so if your retention graph collapses before the end, cut shorter rather than trying to bolt on a stronger ending.
Roughly 150 words at a normal conversational pace of about 150 words per minute. Calm narration runs nearer 130 wpm, fast short-form delivery around 180 wpm. Scale it down proportionally: a 30-second video is about 75 words at a conversational pace, and a 15-second hook is about 38. The script calculator above does the arithmetic and tells you how far over or under each target you are.
No. Shorts now accepts vertical videos up to 3 minutes, and anything at or under that ceiling is treated as a Short. The 60-second figure is one of the most widely repeated stale facts in creator content. The longer cap does not make longer clips better, though — Shorts is still a completion-rate surface.
No, and this is the most expensive misreading of the "keep it short" advice. Short wins only when it is short because nothing else was worth keeping. A 45-second clip watched to the end beats a 15-second clip abandoned at 8 seconds, because the ranking signal is percentage viewed, not duration. Cut the dead air, not the substance.
Below about 8-10 seconds you struggle to establish a hook, deliver a payoff, and give the viewer a reason to rewatch, so most platforms see weaker performance even though the technical minimum is around 5 seconds. The exception is loop-bait: a clip engineered so the end connects back to the beginning can run very short and still accumulate watch time through repeats.
Paste a YouTube URL or upload a file. ClipSpeedAI finds the moments, cuts on sentence boundaries, strips filler and silence, reframes to 9:16 with face tracking, and burns in word-by-word captions. Free on videos under 30 minutes, then $1 for 3 days of full Pro.
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