Reddit video ad specs
The recommended Reddit video 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 | 1GB |
| Supported formats | MP4, MOV |
All supported sizes
| Format | Dimensions | Aspect ratio |
|---|---|---|
| Portrait authoring canvas | 1080 × 1350 px | 4:5 |
| Square authoring canvas | 1080 × 1080 px | 1:1 |
| Widescreen authoring canvas | 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 video ad →Design tips
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.
- •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.
What you need to know
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.
Reddit's 2026 creative study recommends building both image and video ads for mobile at 4:5. Square and widescreen remain supported when the source or placement calls for them, but a portrait master uses more vertical feed space.
Video ads can appear in feed and conversation placements. Because Reddit does not publish one universal pixel safe zone, preview both placements in Ads Manager and keep captions or logos away from the outer edges rather than relying on an invented inset.
How to create a Reddit video ad at the right size
- 1Open Moda and create a new canvas at 1080×1350 pixels.
- 2Design your Reddit video ad using AI generation or start from a blank canvas.
- 3Export as MP4 and upload to Reddit.
Frequently asked questions
What aspect ratios do Reddit video ads support?
Reddit's current ad-types comparison supports 1:1, 4:5, and 16:9 video. Its 2026 creative study recommends 4:5 for mobile-first creative.
How long can a Reddit video ad be?
Reddit allows up to 15 minutes and recommends 60 seconds or less.
What is the Reddit video-ad file limit?
Up to 1GB in MP4 or MOV format.
Sources
Specs last verified: August 28, 2026. Dimensions may change as platforms update their requirements.