TrialReelAll three are vertical, full-screen and swipeable. But each feed rewards slightly different things, so the best version of your video isn't always the same file.
The quick comparison
| Instagram Reels | TikTok | YouTube Shorts | |
|---|---|---|---|
| Max length | 3 min | Several minutes in-app (60-min uploads tested) | 3 min |
| What it rewards | Watch time, likes per reach, sends per reach (Mosseri, 2025) | Whether people watch to the end and rewatch | Whether people keep watching instead of swiping away |
| Tends to work | Polished but personal; shareable to a friend | Raw, fast first second, native feel | Clear topic, searchable title, loopable ending |
The middle row for TikTok and YouTube reflects how the platforms describe their goals publicly and common creator practice — neither publishes its ranking code.
Edit once, adjust three times
- Same core edit. Hook in the first second, no dead air, one idea.
- Instagram: give people a reason to send it to someone ("send this to the friend who…"). Instagram has said sends matter more for reaching people who don't follow you.
- TikTok: start even faster and keep the native look — overly produced intros tend to get skipped.
- Shorts: write a clear title; under a minute is safest, and an ending that flows into the start helps the loop.
Don't upload the watermarked file
Instagram's 2026 originality rules say minimal edits like adding a watermark or changing speed don't make someone else's content original, and accounts that mostly repost aren't recommended. For your own videos, always export a clean file from your editor and upload that to each platform instead of downloading from one app to post on another.
Captions and the buttons
Each app puts buttons in different places. Keep important text in the middle of the screen — away from the bottom fifth (captions and names) and the right edge (like, comment, share buttons). See the reels safe zone.
Upload a reel and get a free predicted score for Instagram, TikTok and YouTube Shorts — hook, pacing, length and captions — plus the fixes that matter. About a minute, no sign-up.