When creating ads for Reddit, it’s not enough to have great copy and visuals — you must also meet the platform’s specific technical requirements. Reddit ad specs ensure your creatives display correctly across devices, load quickly, and deliver an optimal user experience. Whether you’re running a small campaign or a large-scale brand push, knowing these specs is key to achieving better engagement and conversions.
Why Ad Specs Matter on Reddit
Reddit is a unique platform where users are highly engaged in topic-specific communities called subreddits. Unlike other social networks, Reddit’s audience is quick to spot poorly executed ads. If your creative is low-quality, incorrectly sized, or hard to read, it will stand out for the wrong reasons.
Following Reddit’s ad specifications ensures:
Your visuals and text display correctly on both desktop and mobile.
Loading times are fast, improving click-through rates.
Ads look professional and align with Reddit’s advertising standards.
Overview of Reddit Ad Formats and Their Specs
Reddit offers several ad formats, each with its own specifications. Below is a breakdown of the most common ones.
1. Promoted Posts (Link or Text Ads)
Promoted posts are the most common ad type on Reddit. They blend into subreddit feeds but carry a “Promoted” label.
Image Specs:
Recommended Image Size: 1200 x 628 pixels
Aspect Ratio: 1.91:1
File Type: JPG or PNG
Max File Size: 3 MB
Headline Specs:
Max Characters: 300 (desktop may truncate after ~150)
Use short, clear, value-driven text.
Destination URL:
Must be a valid HTTPS link.
2. Video Ads
Video ads are ideal for storytelling, demos, and brand introductions.
Video Specs:
Minimum Resolution: 600 x 336 pixels
Recommended Resolution: 1920 x 1080 pixels (16:9 ratio)
File Type: MP4 or MOV
Max File Size: 1 GB
Length: Up to 15 minutes (shorter videos, 15–30 seconds, generally perform better).
Thumbnail Specs:
Image Size: 1200 x 675 pixels
JPG or PNG format, max 3 MB.
Audio:
Stereo AAC or PCM audio recommended.
3. Carousel Ads
Carousel ads allow multiple images or videos in a single swipeable ad.
Image Specs per Card:
Size: 1200 x 1200 pixels (square) or 1080 x 1920 pixels (vertical).
JPG or PNG, max 3 MB each.
Video Specs per Card:
Same as video ad requirements above.
Number of Cards:
Minimum: 2
Maximum: 6
4. Display Ads (Desktop Only)
Display ads are banner-style ads placed on desktop layouts.
Leaderboard Banner:
Size: 728 x 90 pixels
Medium Rectangle:
Size: 300 x 250 pixels
File Type:
JPG, PNG, or GIF (non-animated preferred).
Max File Size:
150 KB for static images, 500 KB for GIFs.
5. Conversation Placement Ads
These ads appear within the comment section of relevant posts. They use the same specs as promoted posts (1200 x 628 pixels for images, standard headline limits).
Best Practices for Meeting Reddit Ad Specs
Use High-Resolution Assets – Even if Reddit allows smaller dimensions, larger and sharper files look better across devices.
Keep Text Minimal on Images – Too much text can make your ad look cluttered and reduce engagement.
Test Multiple Variations – Try different image ratios and copy lengths to see what works best.
Preview Before Publishing – Reddit Ads Manager allows previews on mobile and desktop; use it to ensure proper display.
Follow Reddit’s Content Guidelines – Avoid prohibited content like misleading claims or offensive material.
Final Thoughts
Understanding and following Reddit ad specs is essential for delivering ads that look professional, load quickly, and attract clicks. Whether you’re creating promoted posts, video ads, carousels, or display banners, using the right dimensions, file types, and size limits will ensure your campaign runs smoothly.
