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TikTok, Instagram Reels and YouTube Shorts all use the same core video spec — 9:16 vertical at 1080×1920 pixels — but differ in length limits, interface overlays and caption safe zones. One well-made vertical master serves all three, provided captions sit inside the shared safe area.
The dimensions and constraints that matter when exporting one video for all three platforms.
| Spec | All three platforms | What differs |
|---|---|---|
| Aspect ratio | 9:16 vertical | Identical across TikTok, Reels, Shorts |
| Resolution | 1080×1920 recommended | All accept up to 4K source |
| Length | Short-form first | Caps vary by platform and account tier |
| UI overlay | Bottom + right rail | Overlay height and position differ per app |
| Watermark policy | Native files preferred | Cross-posted watermarked files downranked |
Every major short-video platform converged on the same canvas: 9:16 vertical video at 1080×1920 pixels, which means one master file can serve TikTok, Reels and Shorts without re-editing.
Source footage can be anything — horizontal, square, 4K — as long as the export lands on that canvas. Reframing horizontal footage without losing the subject is the hard part, which is why VidMint's smart resizer tracks faces and motion through the shot.
Square (1:1) and horizontal (16:9) uploads still play on all three platforms, but they letterbox on a vertical screen, surrendering most of the display — and watch time with it. Vertical is not a style choice; it is the distribution format.
Each platform overlays UI on the bottom and right edge of the player — usernames, captions, action buttons — so text placed in the bottom quarter or hard right of the frame gets covered; the shared safe area is roughly the central 80% of the frame.
Practical rule: keep captions and key visuals in the middle vertical third, centered horizontally. TikTok's bottom overlay is the tallest of the three, so designing for TikTok's safe zone satisfies Reels and Shorts automatically.
VidMint's platform presets position captions inside these zones automatically — the caption system knows each platform's chrome and adjusts placement per export preset.
The correct multi-platform workflow is one vertical master exported per platform preset and uploaded natively to each app — never a watermarked re-upload from a competitor, which every platform's ranking system detects and suppresses.
Watermark-free export is therefore a distribution feature, not a vanity one: VidMint exports are always clean, so the same video can be genuinely native in three places. The TikTok-specific delivery flow is documented on the TikTok integration page.
For covers and profile grids, each platform crops thumbnails slightly differently — center-weighted covers survive all three.
All three use 9:16 vertical video at 1080×1920 pixels as the native full-screen format. One vertical master serves all three platforms without re-editing.
You can, but horizontal video letterboxes on vertical players — most of the screen goes unused and watch time suffers. Reframe to 9:16 with subject tracking instead of uploading 16:9.
1080×1920 covers every platform's display spec. Exporting 4K (2160×3840) future-proofs masters and survives platform recompression better on strong connections.
TikTok overlays the bottom quarter (caption, username, sounds) and the right rail (like, comment, share). Keep text in the central safe area — VidMint's TikTok preset positions captions there automatically.
No — one 9:16 master works everywhere, but export per platform preset so captions sit inside each app's safe zones, and always upload natively rather than cross-posting watermarked files.
A competitor's watermark signals repurposed content, and platforms prioritize native originals in recommendation. Watermark-free exports — VidMint's policy on every plan — avoid the penalty entirely.
Smart 9:16 reframing, per-platform safe zones, always clean export. Free plan.
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