Reddit image ad specs
The recommended Reddit image ad size is 1080 × 1350 pixels (4:5 aspect ratio).
Last updated:
Specifications
| Spec | Value |
|---|---|
| Dimensions (px) | 1080 × 1350 px |
| Aspect ratio | 4:5 |
| Max file size | 3MB (stricter published limit) |
| Supported formats | JPG, PNG, GIF |
All supported sizes
| Format | Dimensions | Aspect ratio |
|---|---|---|
| Portrait (mobile-first) | 1080 × 1350 px | 4:5 |
| Square | 1080 × 1080 px | 1:1 |
| Landscape (4:3) | 1440 × 1080 px | 4:3 |
| Widescreen | 1920 × 1080 px | 16:9 |
Design at this size with Moda
Start with a canvas pre-set to 1080×1350px and let AI generate your design.
Create a Reddit image ad →Design tips
Reddit's current image-ad guide recommends 1080×1350 for 4:5 portrait, 1080×1080 square, 1440×1080 landscape 4:3, or 1920×1080 widescreen. JPG, PNG, and static GIF are supported.
- •Use 1080×1350px at 4:5 when mobile feed coverage is the priority; Reddit's current creative study explicitly favors 4:5.
- •Keep the exported image at or below 3MB, the stricter of Reddit's two currently published first-party limits.
- •Check feed and conversation previews separately, and provide a custom 400×300 thumbnail when the generated crop is weak.
What you need to know
Reddit's January 2026 image-ad guide lists four supported aspect ratios and recommended resolutions: 1080×1080 at 1:1, 1080×1350 at 4:5, 1440×1080 at 4:3, and 1920×1080 at 16:9. Reddit's separate 2026 creative study recommends building for mobile with 4:5, which is why this page leads with the portrait canvas.
The first-party pages currently disagree on the upload limit. Reddit's image-ad guide says JPG, PNG, or GIF up to 3MB, with GIF displayed as a still image. Reddit's newer ad-types comparison says JPEG or PNG up to 20MB and summarizes image inventory as 1:1 or 16:9. This guide uses the stricter 3MB limit and preserves all four ratios from the dedicated image-spec page rather than hiding the conflict.
For conversation placement, Reddit automatically generates a thumbnail for every ad type except free-form ads. The dedicated image guide allows a custom 400×300 JPEG or PNG thumbnail under 500KB. Reddit also warns that creative may crop differently by placement and device, so use Ads Manager previews instead of assuming one fixed safe zone.
How to create a Reddit image ad at the right size
- 1Open Moda and create a new canvas at 1080×1350 pixels.
- 2Design your Reddit image ad using AI generation or start from a blank canvas.
- 3Export as JPG and upload to Reddit.
Frequently asked questions
What sizes does Reddit recommend for image ads?
Reddit's image-ad guide lists 1080×1080 (1:1), 1080×1350 (4:5), 1440×1080 (4:3), and 1920×1080 (16:9). Its 2026 creative study favors 4:5 for mobile.
What is Reddit's image-ad file limit?
Reddit's first-party pages conflict: the dedicated image-ad guide says 3MB, while the ad-types comparison says 20MB. Meeting the stricter 3MB limit is the safer export target.
What is the Reddit conversation thumbnail size?
A custom conversation-placement thumbnail should be 400×300px, JPEG or PNG, and under 500KB.
Sources
Specs last verified: August 28, 2026. Dimensions may change as platforms update their requirements.