ChatGPT Ad Preview
Make sure people see your whole offer before they decide to click: type your headline and description to see your ad the way ChatGPT shows it on every phone size and on desktop, and fix any words that get cut off.
Measured on the live ChatGPT card on 27 October 2026, and matched on 29 real ads. How we measured
Before you launch: turn off creative enhancement in Ads Manager, or ChatGPT can rewrite this ad, and the rewrite “may be shown without your individual review or approval” (OpenAI’s wording). Source
See every screen size
Insurance checks Words to clear with compliance
How the preview is measured
We showed real ads in a signed-out ChatGPT session, read the card’s sizes and fonts from the page, and measured the same card at 360, 375, 390, 412 and 430 points wide and on desktop, in dark and light. The card is the screen width less 32 on a phone, 440 on desktop. The headline gets 1 line and the description 2.
The cut is worked out from the width of every letter in Apple’s system font, so it is the same on any computer. Ads Manager’s own form gave the limits: it counts the headline against 32 and the description against 54, warns that a headline past 32 “may be truncated”, and stops at 50 and 100. The image rules are OpenAI’s: PNG or JPG, square, 640 to 1200 pixels.
What it does not cover: the ChatGPT phone apps, which may draw the card their own way; we have not measured them. Android phones and Windows computers use their own fonts, so a cut there can land a few letters away.
The writing formula, with six examples The guide’s checks before launch
Unofficial. Not affiliated with OpenAI.
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