Reddit ad specs
Reddit's core visual ad formats are image, video, and carousel ads. The current first-party guidance favors mobile-friendly 4:5 creative, while also supporting square and landscape shapes. Image and video have their own pages below; carousel ads use 2–6 JPG, PNG, or GIF cards and can run in feed or conversation placements.
Reddit currently publishes two different image file limits on its own properties: 3MB in the dedicated image-ad guide and 20MB in the ad-types comparison. The image page below uses the stricter 3MB limit and explains the conflict rather than presenting either number as uncontested.
Quick reference
Image Ad1080×1350px
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.
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.
Dimensions
1080×1350
Aspect ratio
4:5
Max file size
3MB (stricter published limit)
Formats
JPG, PNG, GIF
Also supports
Best practices
- •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.
Video Ad1080×1350px
Reddit video ads support 1:1, 4:5, and 16:9 in MP4 or MOV up to 1GB and 15 minutes. Reddit recommends keeping video at 60 seconds or less and favors 4:5 for mobile creative.
Reddit's current ad-types comparison supports MP4 or MOV video at 1:1, 4:5, or 16:9, up to 1GB and 15 minutes. The same page recommends 60 seconds or less. Reddit does not state one required pixel resolution in that comparison, so 1080×1350 on this page is a practical full-resolution 4:5 authoring canvas, not a claimed platform minimum.
Dimensions
1080×1350
Aspect ratio
4:5
Max file size
1GB
Formats
MP4, MOV
Also supports
Best practices
- •Use a 1080×1350px 4:5 master when you want to follow Reddit's mobile-first ratio recommendation.
- •Keep the file in MP4 or MOV, under 1GB, and at 60 seconds or less when following Reddit's recommendation.
- •Preview feed and conversation placements separately because Reddit does not publish one fixed safe zone.
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Start designing →Frequently asked questions
What are the main Reddit ad formats?
Reddit's current self-serve visual formats include image, video, and carousel ads. Carousel ads use 2–6 JPG, PNG, or GIF cards.
What aspect ratio should I use for Reddit ads?
Reddit's current creative study recommends 4:5 for mobile-first image and video creative. Its published specs also support square and landscape formats.
Why do Reddit's image file limits differ?
Two current first-party pages disagree: the dedicated image-ad guide says 3MB, while the ad-types comparison says 20MB. This guide recommends meeting the stricter 3MB limit.
Other platform guides
Sources
Guide last verified: August 28, 2026. This hub summarizes 2 formats and cites 6 sources across this page and the linked format pages.
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