The three big short-form platforms all want a tall, vertical video — but the details differ enough that a clip perfectly sized for one can look cropped or cluttered on another. Here are the specs that actually matter in 2026, and how to cut one master clip into a version for each without re-editing from scratch.
The short answer
- Aspect ratio: 9:16 vertical for all three. This is the one spec they fully agree on.
- Resolution: 1080 × 1920 is the safe, universal target. Export at this and every platform is happy.
- Frame rate: 30fps is fine everywhere; 60fps is worth it for fast motion if your source supports it.
The differences are in length and where the interface covers your video — the “safe zone.”
Instagram Reels
- Aspect ratio: 9:16 (1080 × 1920).
- Length: up to 3 minutes, but 15–30 seconds tends to perform best.
- Safe zone: Instagram is the most aggressive about covering the frame. Keep captions and key visuals clear of the bottom ~35% (caption, username, audio and action buttons) and the top ~10%.
YouTube Shorts
- Aspect ratio: 9:16 (1080 × 1920). Anything taller than square is treated as a Short.
- Length: up to 3 minutes.
- Safe zone: the right side and bottom hold the like/comment buttons and the title. Keep text out of the bottom ~15% and away from the right edge.
TikTok
- Aspect ratio: 9:16 (1080 × 1920).
- Length: up to 10 minutes, but the algorithm still favors tight, high-retention clips.
- Safe zone: similar to Instagram — a tall right-hand column of buttons plus a caption block at the bottom. Center your subject and keep text in the middle third.
The safe-zone rule that works everywhere
Rather than memorize three overlays, follow one conservative rule: keep all text and essential action inside the center 80% vertically and 90% horizontally. If your captions and subject live in that box, they survive every platform’s UI. This is why professional-looking short-form video keeps captions around the lower-middle rather than pinned to the very bottom.
Turning one clip into three
You don’t need to edit three times. Start from your best cut and:
- Export a clean 1080 × 1920 master with your captions placed in the universal safe zone.
- If your source was filmed horizontally, auto-reframe it to vertical so the subject stays centered instead of being chopped off — this matters far more than any per-platform tweak.
- Trim length to suit each destination: a punchy 20-second cut for Reels and Shorts, and a slightly longer version for TikTok if the content earns it.
If your original footage is a different shape entirely, the fastest path is to resize it for TikTok, Reels and Shorts in one step and adjust from there.
A few things that quietly hurt reach
- Letterboxing: uploading a 16:9 video with black bars top and bottom wastes most of the screen and reads as recycled content. Reframe to fill the vertical frame instead.
- Visible watermarks from other apps: platforms deprioritize clips stamped with a competitor’s logo. Export clean.
- Tiny or edge-pinned captions: if the platform’s own UI overlaps your text, viewers can’t read it and swipe away.
Bottom line
Master 9:16 at 1080 × 1920, keep everything important in the center safe zone, and reframe rather than letterbox. Nail those and one clip works across all three feeds. You can do the resizing and reframing free in your browser with the reel maker — no upload, no watermark.