One of the most common mistakes new creators make is producing content without understanding each platform's video length limits and dimensions.
YouTube, Instagram, and TikTok all share the same short-form format on the surface, but their maximum lengths and display sizes differ in small yet important ways.
Upload the exact same video everywhere without knowing these differences and your content not only looks lower quality — it also hurts your views and your chances of going viral.
In this post, we'll cover the video lengths and sizes every new creator needs to know for each platform, plus the key things to watch out for when you upload.
Here's the maximum video length each platform allows:
Instagram Reels: up to 90 seconds
TikTok: up to 10 minutes
YouTube Shorts: up to 180 seconds
TikTok started at 15 seconds, expanded to 60 seconds, then 3 minutes, and now allows uploads up to 10 minutes.
The caps vary by platform, but the algorithmic sweet spot is 20–30 seconds. YouTube's own analysis has found that completion rates peak on videos under 30 seconds.
Short-form rewards fast, tight pacing — so treat the maximum length as a technical limit, not a target, and build for the length viewers actually prefer.
➡️ Keep in mind
✔️ For longer stories, use short-form only as the hook — move the full story to long-form video or a blog post
✔️ Three 30-second videos will outperform one 60–90 second video almost every time
Short-form video uses the same 9:16 (1080x1920) base ratio everywhere, but each platform's UI covers different parts of the screen. Here's what to watch for on each one.
✔ Reels themselves are 9:16, but in the feed they're cropped to 4:5.
✔ Text near the bottom of your thumbnail can get cut off or look messy in the feed.
✔ The top, right, and bottom edges are covered by icons and profile info.
➡️ Production tips
Place text in the center or upper-middle of the frame
Keep captions and text out of the bottom 250px
Leave at least 5–8% margin on the left and right edges
TikTok stacks the most UI along the right side, top, and bottom of the screen, leaving you the least usable space.
➡️ Production tips
Keep text away from the right-side like/comment/share/profile column
The top overlaps with the username and sound info
The bottom is caption territory — keep your on-screen text centered
➡️ Production tips
No critical text in the top 15–20% of the frame
Position text slightly above center so it doesn't collide with bottom captions
Keep logos away from the very top and very bottom
If you want to upload the same video to all three platforms, build to the shortest limit — the classic 60-second YouTube Shorts cap.
Cut a 90-second or 2-minute video and you'll find it won't fit everywhere.
And since every platform stacks UI along the top, bottom, and right edges,
center your text and captions, and
leave generous margins —
that's what lets a single source file work cleanly across every platform.
The most common layout for turning long-form YouTube videos into short-form clips looks like this:
Place the 16:9 original in the center of a 9:16 frame
Top: the clip's title or hook line
Bottom: captions, the key message, and your logo
The empty space above and below renders as a black background — which actually works in your favor, making the title up top and the captions below easier to read.
If you have a huge backlog of content to convert and not enough time to edit, an AI short-form generator can do the heavy lifting.
Tools like FikaClip automatically analyze your long-form videos and cut the highlights into ready-to-post short clips — well worth adding to your workflow :)
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Short-form essentials every new creator should remember
Max lengths differ by platform → the sweet spot is 20–30 seconds
The aspect ratio is the same, but each platform's UI covers different areas
Reusing one video across platforms requires centered text and generous margins
For long-form repurposing, 16:9 centered + text above and below is the most efficient layout
Short on editing time? Put an AI short-form tool to work