Ad Specs
Use these dimensions, aspect ratios, and file limits to make sure your creative renders crisply across every screen.
Image resolution
Upload artwork at 2× the slot dimensions, matching the exact aspect ratio. This ensures sharp rendering on high-density displays.
Slot specifications
| Slot | Display size | Recommended upload | Aspect | Max file size | Formats |
|---|---|---|---|---|---|
Medium Rectangle Sidebar, in-article, homepage banner zones | 300×250 | 600×500 | 6:5 | 2 MB | JPG, PNG, WebP |
Large Rectangle Sidebar (high-visibility), in-article | 336×280 | 672×560 | 6:5 | 2 MB | JPG, PNG, WebP |
Half Page Sidebar only — long-form articles, news pages | 300×600 | 600×1200 | 1:2 | 3 MB | JPG, PNG, WebP |
Leaderboard Below post / footer of articles | 728×90 | 1456×180 | 8.09:1 | 2 MB | JPG, PNG, WebP |
Billboard Homepage leaderboard band (desktop) | 970×250 | 1940×500 | 3.88:1 | 2 MB | JPG, PNG, WebP |
Mobile Banner Homepage leaderboard band (mobile) | 320×50 | 640×100 | 6.4:1 | 1 MB | JPG, PNG, WebP |
Large Mobile Banner Homepage leaderboard band (mobile) | 320×100 | 640×200 | 3.2:1 | 1 MB | JPG, PNG, WebP |
Where your ad appears
| Placement | Location on site | Accepted sizes |
|---|---|---|
Homepage – top right (300x250) Highest traffic placement on the site. | Homepage, top of the right column under Latest, beside the lead story (above the fold) | 300×250, 336×280, 300×600 |
Homepage – sidebar (300x600) Stays visible while readers scroll the homepage. | Homepage, sticky right rail beside the video/post grid (mobile: lower in the page) | 300×250, 336×280, 300×600 |
Homepage – in-content (300x250) Mid-page unit inside the homepage scroll. | Homepage, box between two content sections (mobile: after the third card) | 300×250, 336×280 |
Article sidebar banner Stays visible while readers scroll long articles. | Sidebar of article, blog and video pages (also fills unassigned homepage slots) | 300×250, 336×280, 300×600 |
Below article banner Reaches readers who finished the piece — strongest intent. | Directly beneath article and video content | 728×90 |
Homepage – leaderboard (728x90/970x250) Wide, high-viewability horizontal unit in the homepage scroll. | Homepage, full-width horizontal band between content sections (never next to CE) | 728×90, 970×250, 320×50, 320×100 |
Homepage sponsored post Native card that reads like editorial content. | Sponsor post cards on the homepage | — |
Article sponsored post Native placement next to related reading. | Sponsor cards in article and video sidebars | — |
Slot-specific notes
Medium Rectangle (300×250)
Most flexible slot. Note the aspect is 6:5 (wider than tall). Uploading a 5:6 (taller than wide) file will be cropped or distorted.
Half Page (300×600)
Highest impact sidebar unit. Because of its size on screen, even 1x uploads often look acceptable — but 2x is still recommended.
Leaderboard (728×90)
Wide horizontal banner. Keep typography large and centered — narrow vertical space.
Aspect ratio matters as much as resolution
The 300×250 slot is 6:5 (wider than tall). Uploading a 5:6 (taller-than-wide) file at any resolution will be cropped or squished. Match the slot's aspect ratio first, then double the resolution.
Per-viewport creative variants
The uploader accepts up to three creatives per ad — one for desktop, tablet, and mobile. The platform automatically serves the best fit to each visitor.
- Desktop is required and acts as the fallback when device-specific art isn't supplied.
- Tablet and mobile are optional but recommended for tight phone layouts and high-DPI tablet screens.
- All three variants share the same slot dimensions — pick the size once in the wizard's first step, then upload one image per device.
Format recommendations
WebP — best compression. Use this when possible; smaller files load faster and there's no visible quality loss.
JPG — best for photographs and complex imagery. Save at 80–90% quality.
PNG — best for logos, flat color, and any creative that needs transparency or sharp text.
Animated formats (GIF, animated WebP) and video are not currently supported.
Pre-upload checklist
- Resolution is at least 2× the display size
- Aspect ratio matches the slot exactly
- File is under the slot's size cap
- Format is JPG, PNG, or WebP
- Critical text and logos are well inside the safe area (avoid edges)
- The clickthrough URL goes to a working, mobile-friendly landing page
Questions? Contact your account manager or the support team.