Reddit Ad Sizes & Specs (2026)
Reddit ads are promoted posts that sit in the feed and inside comment threads, so the creative has to feel like it belongs in a community rather than interrupting it. The recommended image ratio is 4:5 (1080 × 1350) for the strongest mobile footprint, though 1:1 (1080 × 1080) and 1.91:1 (1200 × 628) are supported. Reddit users are famously ad-skeptical and value authenticity, so plain, honest creative and a headline that reads like a genuine post generally beats glossy, high-production banners. The headline (the post title) does most of the work, so write it carefully.
Reddit ad specifications
| Placement | Dimensions (px) | Aspect ratio | Max file size | File types | Headline | Notes |
|---|---|---|---|---|---|---|
| Promoted post (vertical) | 1080 × 1350 | 4:5 | 20 MB | JPG, PNG, GIF | 300 chars | Recommended ratio; largest footprint in the mobile feed. |
| Promoted post (square) | 1080 × 1080 | 1:1 | 20 MB | JPG, PNG, GIF | 300 chars | Balanced option across desktop and mobile. |
| Promoted post (landscape) | 1200 × 628 | 1.91:1 | 20 MB | JPG, PNG, GIF | 300 chars | Link-style ratio; smaller footprint on mobile. |
| Carousel card | 1080 × 1080 | 1:1 | 20 MB | JPG, PNG | 300 chars | 2–6 cards, each with its own image, headline and destination URL. |
Last verified July 5, 2026. Specs change often.Always confirm against the official sources below before shipping.
Tips for Reddit ad creative
- Use 4:5 (1080 × 1350) for the biggest mobile presence; 1:1 and 1.91:1 are supported fallbacks.
- The headline is the post title and carries the ad. Reddit allows up to 300 characters, but the first ~100 do the work.
- Match the tone of the communities you're targeting; overly polished, salesy creative underperforms with Reddit audiences.
- Keep on-image text minimal and let the title plus a clean visual communicate the offer.
Reddit ad size FAQ
What size is a Reddit ad?+
The recommended Reddit ad image size is 1080 × 1350 pixels (4:5). Reddit also supports 1080 × 1080 (1:1) and 1200 × 628 (1.91:1). The 4:5 ratio gives the largest footprint in the mobile feed, where most Reddit browsing happens.
What is the best Reddit ad size in 2026?+
The best Reddit ad size is 1080 × 1350 pixels (4:5), because it occupies the most space in the mobile feed. Pair it with a strong, authentic headline, since the post title carries most of the ad's persuasive weight on Reddit.
What is the maximum file size for a Reddit image ad?+
A Reddit image ad can be up to 20 MB in JPG, PNG or GIF format. Upload a high-resolution asset so the creative stays sharp when a user expands the promoted post.
How long can a Reddit ad headline be?+
A Reddit ad headline (the promoted post title) can be up to 300 characters, but the first roughly 100 characters are what most users read. Write a clear, honest title that reads like a genuine post rather than a slogan.
What creative style works best on Reddit ads?+
Authentic, low-key creative works best on Reddit. The community is ad-skeptical, so plain visuals, minimal on-image text and a headline that matches the tone of the target subreddits tend to outperform glossy, high-production banners.
Official sources
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