TikTok Shop Image Size Cheat Sheet

TikTok Shop is built around vertical, video-first browsing, which means a flat square product photo — the standard for Amazon and most marketplaces — doesn’t fill the frame the way TikTok’s interface expects. This is a quick reference for the ratios that matter and how to get a square product photo into TikTok Shop’s preferred vertical shape without a re-shoot.

The ratios that matter

• Product photo (listing gallery): square 1:1 is accepted and common, similar to other marketplaces.
• Video cover / showcase image: roughly 9:16 (portrait, matching TikTok’s native video frame) is what actually gets full-screen placement in the app’s shopping surfaces.

The gap between these two is the practical problem: most sellers only have the square listing photo, not a vertical version, because that’s what every other marketplace asks for.

Turning a square photo into a 9:16 cover

An ai photo extender tuned for TikTok Shop takes the existing square product photo and extends the background vertically — above and below the product — until it fills a 9:16 frame. The product itself stays centered and untouched; only the new space above and below is generated.

Steps:

1. Open the TikTok Shop preset — the canvas locks to 9:16 automatically.
2. Keep the direction field simple unless your background is unusual — “extend the background vertically, keep it clean” is usually enough for a plain studio shot.
3. Generate and check the top and bottom edges specifically, since that’s where the new content is added — look for a lighting mismatch or an oddly abrupt background change.
4. Download and use the result as your video cover or showcase image.

What doesn’t work well here

Vertical extension is one of the more visually obvious transformations, because a large fraction of the final frame is newly generated. Photos with a strong directional light source (a hard shadow falling one way) are more likely to show a seam where the generated area doesn’t quite continue the same light direction — if that happens, a second generation with a direction like “continue the same shadow direction and light angle” usually helps.

Products photographed very close up, filling almost the entire square frame, extend more predictably than photos with a lot of empty background already in the original — there’s less existing context for the model to misread when the subject dominates the frame.

Related sizing guides

If the same product needs to go to more than TikTok Shop, see the Amazon listing guide and the Etsy sizing guide — each marketplace preset locks to that platform’s specific ratio from the same uploaded photo. For a broader look at where AI extension is and isn’t reliable, see When AI Photo Extension Fails.

Try the TikTok Shop preset directly — 2 free previews, no sign-up required.