TikTok Ad Specs: Sizes, Safe Zones, and Format Basics
The TikTok ad specs that actually matter: 9:16 vertical, 1080x1920, safe zones for UI overlays, and why the first seconds decide performance.
TikTok ads should be vertical 9:16 video, typically delivered at 1080x1920, with your key elements — face, product, text — kept inside the safe zone away from the edges where TikTok's own UI (caption, buttons, username) overlaps the frame. TikTok accepts a range of durations and file formats, and those details shift over time, so confirm the current limits in TikTok's ad manager before upload. The stable rules are the ones above: full-screen vertical, safe zones respected, and a hook in the first second or two.
What size and aspect ratio should a TikTok ad be?
Native 9:16 vertical is the default and the right choice for almost every campaign. TikTok is a full-screen vertical feed, and anything letterboxed — a square or horizontal video floating in black bars — instantly reads as an ad that wasn't made for the platform. Render at 1080x1920 or higher so the video stays crisp on modern phones.
Where are the safe zones?
TikTok layers its interface on top of your video: the caption and profile info sit along the bottom-left, the engagement buttons run down the right edge, and system UI can intrude at the very top. Keep anything the viewer must read or see — headlines, captions you burn in, the product itself at key moments — roughly centered, away from the bottom quarter and the right rail. If a line of on-screen text gets covered by the like button, it may as well not exist.
How long should a TikTok ad be?
TikTok allows a wide duration range, but shorter usually works harder. What matters more than total length is the opening: viewers decide to swipe within the first moments, so front-load the hook — the claim, the problem, the surprising visual — instead of building up to it. Your hook rate tells you whether the opening is doing its job; if you need opening lines, run your product through a hook generator and test several.
Do TikTok ads need sound and captions?
TikTok is a sound-on platform, so voiceover and music matter more here than on most feeds — but plenty of viewers still watch muted. Burned-in captions cover both cases and keep the message readable when text-heavy moments land in the safe zone.
What actually moves performance once specs are right?
Specs are the entry fee, not the strategy. Two ads with identical dimensions can produce wildly different ROAS because the creative — hook, angle, pacing — decides the outcome, and nobody predicts the winner in advance. The practical answer is volume: test many variations and let the auction sort them. That's the workflow AI UGC ads are built for. With Polaris connected to Claude over MCP, you attach a product photo, describe the angle, and get spec-correct 9:16 UGC-style ads rendered in batches — the whole flow runs inside Claude, and your first batch of 12 is free. Then measure results against your margins with a ROAS calculator rather than guessing.