Docs/Tools and templates
Ad specification sheet
Every size, format and file limit we accept, on one page. Print it, download it, or hand it to your designer.
Updated September 2026
Display advertising
| Placement | Specification | Formats | File limit | Notes |
|---|---|---|---|---|
| Medium rectangle | 300 × 250 px | JPG, PNG, GIF, WebP | 150 KB | Articles and sidebars. Most widely supported size. |
| Leaderboard | 728 × 90 px | JPG, PNG, GIF, WebP | 150 KB | Desktop headers and above content. |
| Mobile banner | 320 × 50 px | JPG, PNG, GIF, WebP | 50 KB | Mobile placements. Keep type large. |
| Large mobile banner | 320 × 100 px | JPG, PNG, GIF, WebP | 80 KB | Mobile in-content. |
| Half page | 300 × 600 px | JPG, PNG, GIF, WebP | 200 KB | High-attention sidebars. |
| Large rectangle | 336 × 280 px | JPG, PNG, GIF, WebP | 150 KB | Editorial content. |
| Billboard | 970 × 250 px | JPG, PNG, GIF, WebP | 250 KB | Premium desktop positions. Confirm availability. |
| Wide skyscraper | 160 × 600 px | JPG, PNG, GIF, WebP | 150 KB | Legacy sidebars. Ask before producing. |
| Animation | 15 s max, 3 loops | GIF, HTML5 on request | — | End on a clear final frame containing the offer and logo. |
Newsletter sponsorships
| Placement | Specification | Formats | File limit | Notes |
|---|---|---|---|---|
| Primary sponsor banner | 600 × 200 px (1200 × 400 @2x) | JPG, PNG | 200 KB | Top of the issue. Include logo inside the image. |
| Featured item image | 600 × 300 px (1200 × 600 @2x) | JPG, PNG | 250 KB | Runs beside a short copy block. |
| Logo | 300 px wide, transparent | PNG, SVG | 60 KB | Horizontal lockup preferred. |
| Headline | ≤ 60 characters | Plain text | — | One idea. No ALL CAPS. |
| Body copy | 40–120 words | Plain text | — | Written for the reader, not about the brand. |
| Call to action | 2–5 words + URL | Plain text | — | Use a tracked link. See UTM guide. |
| Dedicated send | 600 px wide layout | HTML or copy + images | 100 KB HTML | Publisher approval required. Plain-text version supplied. |
Podcast advertising
| Placement | Specification | Formats | File limit | Notes |
|---|---|---|---|---|
| Host-read 30 s | 70–85 words | Talking points (doc) | — | Host reads in their own words. Send bullets, not a script. |
| Host-read 60 s | 140–170 words | Talking points (doc) | — | Room for one story or example. |
| Produced spot | 15 / 30 / 60 s exact | WAV 44.1 kHz 16-bit or MP3 192 kbps+ | 20 MB | Loudness −16 LUFS integrated, −1 dBTP peak. No music bed clashing with show. |
| Vanity URL / promo code | 1 short URL, 1 code | Plain text | — | Easy to say aloud. Lower-case, no hyphens. |
| Position | Pre-roll, mid-roll or post-roll | — | — | Mid-roll performs best for host reads. |
Sponsored features
| Placement | Specification | Formats | File limit | Notes |
|---|---|---|---|---|
| Article length | 600–900 words | Google Doc or .docx | — | Written or edited by The Ad Mart. Clearly labelled as sponsored. |
| Headline | ≤ 70 characters | Plain text | — | Say something useful, not the brand name. |
| Hero image | 1600 × 900 px | JPG | 600 KB | Landscape photography. No text baked in. |
| Inline images | 1200 px wide, up to 2 | JPG, PNG | 400 KB each | Captions and credits supplied. |
| Author photo | 600 × 600 px | JPG | 200 KB | Square crop, face centred. |
| Author bio | ≤ 50 words | Plain text | — | Name, role, one credential, one link. |
Individual publishers may require a different size or file limit. We confirm the final placement list before you export anything — seeDisplay ad sizes and specifications.
Social campaign