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Creative Cheat Sheet

Reddit Ad Specs

Sizes, ratios, file types, and character limits for every Reddit ad format — image, video, carousel, and conversation.

RedditMaster Agent
Single image
1200 × 628 or 1080 × 1080 px · PNG/JPG/GIF
Square
1080 × 1080 px (1:1)
Vertical
1080 × 1350 px (4:5)
Video ratios
16:9 · 1:1 · 4:5 · 9:16 · MOV/MP4
Carousel
2–6 cards · 1080 × 1080 px each
Headline limit
300 characters

Image / Free-form Ad

The default Reddit feed ad. A single image (or text) post that looks native in-feed — best for awareness and click-through to a landing page.

Recommended size
1200 × 628 px (landscape) or 1080 × 1080 px (square)
Aspect ratios
1.91:1, 1:1, and 4:5
File types
PNG, JPG, GIF
Headline / title
Up to 300 characters (keep the key message in the first ~100)
Call-to-action
Optional CTA button (e.g. Learn More, Sign Up, Shop Now)
Destination URL
Required — your landing page

Video Ad

Sound-optional video in the feed. Strong for product demos and storytelling — most Reddit video ads perform best kept short and captioned.

Aspect ratios
16:9, 1:1, 4:5 (and 9:16 for vertical placements)
Recommended length
Under 30 seconds; hook in the first 2–3s
File types
MOV, MP4
Captions
Burn in captions — most feed video is watched muted
Headline / title
Up to 300 characters
Thumbnail
Auto-pulled from the video or upload a custom frame

Conversation Placement

Ads that appear within the comments of a post, where intent and attention are highest. Creative follows the image/video specs above.

Creative
Uses standard image or video ad assets
Where it shows
Inside the comment threads of relevant posts
Best use
High-intent placements alongside on-topic discussion
Headline / title
Up to 300 characters

Aspect ratios and recommended dimensions above are stable, but exact upload limits (max file size, bitrate) and available formats can change — confirm the current hard limits in Reddit Ads Manager before you finalize creative.

Reddit Ad Specs FAQ

For a single-image feed ad, 1200 × 628 px (1.91:1 landscape) or 1080 × 1080 px (1:1 square) are the safest choices — they render cleanly on both desktop and mobile. Vertical 4:5 (1080 × 1350 px) is also supported and takes up more screen on mobile. Upload PNG, JPG, or GIF.

Reddit allows up to 300 characters in the ad headline/title, but only the first ~100 characters are reliably visible before truncation on mobile. Lead with your core message and call to action.

Reddit accepts MOV and MP4 video in 16:9, 1:1, 4:5, and 9:16 aspect ratios. Keep videos under 30 seconds with a hook in the first 2–3 seconds, and burn in captions since most feed video is watched with the sound off.

A Reddit carousel supports 2 to 6 cards. Each card has its own 1:1 (1080 × 1080 px) image, headline, and destination URL, so you can feature multiple products or steps in a single swipeable unit.

Aspect ratios and recommended dimensions are stable, but exact upload limits (max file size, video bitrate) and available formats are updated periodically. Always confirm the current hard limits in Reddit Ads Manager before you finalize creative.

They work best together. Paid ads buy reach fast, but Reddit users trust organic, rule-respecting participation far more. Many teams use ads for launches and lean on organic karma-building and helpful replies for durable, lower-cost growth.

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Reddit Ad Specs — Sizes, Formats & Character Limits | RedditMaster