Ad specs / Reddit
Reddit ad specs and character limits
Reddit ad character limits, image sizes and hard floors. Every figure quoted from Reddit's own documentation with the date it was read.
read unverified Source: https://business.reddithelp.com/helpcenter/s/topic/Ad-Formats
Character limits and sizes
| Placement | Headline | Body text | Max file |
|---|---|---|---|
| Feed: image 4:5 1080 x 1350 | 300 | not stated | 3 MB |
Where two numbers are given, the first is what stays visible and the second is what the field accepts. They're different questions. Copy over the cap gets rejected at upload. Copy over the visible limit runs, and gets cut off. Most guides publish only one of the two.
The comment thread is part of the ad
Reddit is the one platform where the audience actively punishes advertising that looks like advertising, and the punishment is not being ignored — it is a top comment explaining why your product is bad, attached to your paid placement, seen by everyone you paid to reach. So a variant matrix here is not only a performance test, it is a risk test: every cell has to survive contact with an adversarial reply. Budget per community rather than pooled, because communities differ enough that a pooled number hides which one is working.
- The limits for Feed: image were never checked against the platform's own documentation.
- Which call-to-action buttons this platform offers.
- Which ad categories are restricted here, and what declaring one does to your targeting.
- How this platform tracks conversions, and its default attribution window.
Listed rather than omitted. A spec sheet with no gaps is either complete or hiding something, and from the outside those look identical.
Count these before you paste
AdPlaybook holds this spec as dated data and checks a finished campaign against it — character counts, audience floors, forbidden exclusions — before you paste anything into Reddit Ads Manager. It is arithmetic, not a judgement call, so it runs on every campaign and costs nothing.