Reddit · 4 formats
Reddit ads are promoted posts. Images run 1:1 or 4:5 at 1200 wide, video runs 2 seconds to 15 minutes, and the headline is the ad: 300 characters max, under 100 recommended.
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1:1From Reddit's Ads help center. Recommended size first; the cards below carry the minimums, file limits and text limits.
| Format | Recommended size | Ratios | Max file |
|---|---|---|---|
| Image | 1200x1200 | 1:1, 4:5, 4:3, 16:9, 3:4 | 20MB (GIF 3MB) |
| Video | 1200x1500 | 1:1, 4:5, 16:9, 4:3, 3:4 | 1GB |
| Carousel | 1200x1200 | 1:1, 4:5, 4:3, 16:9 | 20MB (GIF 3MB) |
| Free-form | Rich text post | Any, inline | - |
Feed · Conversation
Mobile feed takes 1:1, 4:5, 4:3 (1440x1080) and 16:9 (1920x1080). Desktop takes 1:1 and 3:4 (900x1200).
Feed · Conversation
Up to 30 frames per second. In the conversation placement video is click to play.
Feed
2 to 6 cards, each with its own caption and link.
Feed · Conversation
A full post with images, video and links inline. It reads like the posts around it, which is the point.
By format the mix is 59.1% image, 26.6% video, 14.3% carousel. Reddit creative is the whole post, so the shape that matters is the one the feed gives it: 1:1 or 4:5.
On Reddit the headline does the work. It sits above the creative in the same type as every organic post, so write it like a post, not a tagline. Write it first, then pick the image.
Make one 4:5 and one square. 4:5 is the tallest the mobile feed shows; square is the shape every placement takes, desktop included.
For what brands actually run, the Reddit ads library shows real promoted posts. For headline openings, see ad hooks.
Ask Sprites for Reddit image ads and it builds one creative, then recomposes it to each size below in the same run. No cropping by hand, no second brief.
1200x1200 at 1:1 or 1200x1500 at 4:5. The mobile feed also takes 4:3 and 16:9; desktop takes 1:1 and 3:4. Maximum file size is 20MB.
300 characters. Reddit recommends 100 or fewer.
2 seconds to 15 minutes, up to 1GB. 5 to 30 seconds is the recommended range.
2 to 6, each with a 50-character caption and its own link.
Sprites builds image ads in every placement size for Meta, Google, LinkedIn, Reddit and TikTok from one prompt.
