Ads
Ad placement
An ad placement is where an ad is shown: a Facebook or Instagram feed, Stories and Reels, TikTok's feed, a pin, a banner on a website. Each placement has its own picture size and shows a set amount of text.
The same ad usually runs in several placements at once, so it needs a picture per shape: 4:5 for the feeds, 9:16 for full-screen Stories, Reels and TikTok, 1.91:1 for display banners. Full-screen placements cover the top and the bottom of the frame with the app's buttons, so text belongs in the middle. Copy gets cut too: a feed shows about 125 characters of primary text before "See more", TikTok about 100.
On eroq
In the Ads Studio you pick the places first (Facebook and Instagram feeds, Stories & Reels, TikTok, Snapchat, Pinterest, Google Display, LinkedIn, X): each ad renders in every size they need, its copy is cut to what they show, and it downloads at the exact size of each place.
Questions
What size should an Instagram feed ad be?
1080×1350 pixels (4:5) for the most room in the feed; 1080×1080 (1:1) also works. Stories and Reels take 1080×1920 (9:16).
Can one picture serve every placement?
Not well: a 4:5 feed picture is cropped or letterboxed in a 9:16 Story. Make one picture per shape, which is what an ad made for several placements needs.
Where should the text go in a Story ad?
In the middle of the frame: the top fifth and the bottom quarter are covered by the app's profile line, captions and buttons.