Adsterra image & ad sizes

Native Medium confidence — verified against reputable sources. Verified 2026-10

Drop a creative or type a size — see every placement it fits

Drag & drop your creative or click to choose a file Checks every sized placement at once (3)

Or type a size

Nothing is uploaded or saved — the check runs entirely in your browser.

3placements
2layouts to produce
3aspect ratios

Image 3

Official documentation

Size map

Every frame is drawn to the same scale · largest 600×400

600×400 2
320×240 1
192×192 3

Numbers match the rows of the size table

All Adsterra sizes

Placement	Ratio	Max weight	Formats	Text limits	Confidence
1. Native Banner — Creative Image Landscape	4:3	350 KB	JPGPNG	1	High confidence — confirmed in the official documentation
Notes & best practice The primary creative for a Native Banner campaign requires one image and one title. Upload the image at exactly 320x240 pixels (JPG or PNG, up to 350 KB), despite conflicting aspect ratio labels. The title can be up to 64 characters. You can add up to 15 creatives per test campaign. For best results, use images featuring people or large objects on contrasting backgrounds, and include numbers or facts in the headline. Impressions are only counted if at least 50% of the banner is in view. There are no options for logos or separate CTA fields. Full specification Size (px) Ratio 4:3 Max weight 350 KB Formats JPG, PNG Text limits Title64chars High confidence — confirmed in the official documentation Source: adsterra.com (opens in a new tab)
2. Social Bar — Creative Image Landscape	3:2	350 KB	—	3	Medium confidence — verified against reputable sources
Notes & best practice Social Bar ads are built from Adsterra templates that look like in-page push notifications, chat icons, widgets or full-page interstitials. Depending on the template, the image is 600x400, 340x180 or 192x192 px, up to 350 KB; some templates also need a separate icon. Titles take up to 30 characters and descriptions up to 60. You can test up to 15 creatives per campaign. Full specification Size (px) Ratio 3:2 Max weight 350 KB Text limits Title30charsmax Description60charsmax CTA30charstemplates with a button Medium confidence — verified against reputable sources Source: adsterra.com (opens in a new tab)
3. Social Bar — Icon Square	1:1	350 KB	—	—	Medium confidence — verified against reputable sources
Notes & best practice Square icon that some Social Bar templates, such as the full-page interstitial skin, show next to the main image. Adsterra specifies 192x192 px, up to 350 KB. Full specification Size (px) Ratio 1:1 Max weight 350 KB Medium confidence — verified against reputable sources Source: adsterra.com (opens in a new tab)
4. Native Banner Unit — Rendered Block (Medium Rectangle) Display banner Display size, not an upload sizesee 1	6:5	350 KB	JPGPNG	1	Medium confidence — verified against reputable sources
Notes & best practice On publisher pages, native banners render by default as a block of 3 to 4 snippets, each containing a title and an image scaled to roughly 300x250 pixels. Blocks can be arranged horizontally on desktop or vertically on sidebar and mobile layouts. Adsterra advises no more than 2 native blocks per page and 2 or 3 ads per block on mobile. This is a display size only, advertisers must still upload the standard 320x240 creative. Full specification Size (px) Ratio 6:5 Max weight 350 KB Formats JPG, PNG Text limits Title64chars Medium confidence — verified against reputable sources Source: adsterra.com (opens in a new tab)
5. Native Ads Widget — Leaderboard Container Display banner Display size, not an upload sizesee 1	8.09:1	—	JPGPNG	1	Medium confidence — verified against reputable sources
Notes & best practice Native banners come as a row of 4 by default; publishers can keep 3 or switch to a vertical set. Adsterra managers can adjust the block to fit a classic 728x90 banner slot on request. This is a publisher-side placement configuration, not an advertiser upload specification. Full specification Size (px) Ratio 8.09:1 Formats JPG, PNG Text limits Title64chars Medium confidence — verified against reputable sources Source: adsterra.com (opens in a new tab)

High confidence — confirmed in the official documentation Medium confidence — verified against reputable sources Lower confidence — changes frequently, verify before launch shortened, full wording in the row details reference size, not a separate upload: the checker, kit and size map skip it