Where do a subreddit's rules come from?

Each community writes its own and lists them on its page, under Rules in the sidebar on reddit.com or the About tab in the app. This tool reads that same list. Reddit's own rules apply everywhere on top of them (Reddit Rules).

Can it tell me for sure my post won't be removed?

No. A moderator decides, and many communities also run AutoModerator, which applies rules its moderators write on a moderator-only wiki page (Reddit Help). We can't read that page, so this tool checks the written rules only.

Why does it say a rule is about my account?

Some rules are about the poster, not the post: karma, how old the account is, how often you've posted there. Nothing in a post shows those, so we list them for you to check on your own profile instead of guessing.

What does "might break" mean?

The post touches the rule, but whether it crosses the line depends on how a moderator reads it. Rewrite that part, or message the moderators and ask before you post.

Yes, with the result, so the link you share shows the same answer. Anyone with the link can read it. We keep it for 7 days.

Does it work for comments?

It's built for posts. Rules a community marks as only about comments are listed but not checked.

Free tool

Subreddit rules checker

Paste your post and pick a subreddit. See which of its rules the post likely breaks, with each rule quoted, before you post.

Check a post

How it reads your post

The rules, as the community wrote them. We read its rules from Reddit and check your post against each one. Every quote is copied from the rule; if a quote doesn't match the rule word for word, we leave it out.
What can be measured, measured. Title and post length against limits a rule states, links against a rule that bans them, and whether the community takes text posts at all.
What only you can check, listed. Karma and account-age minimums and how often you may post, when the rules state them.

What no outside check can see

Moderators can remove a post for reasons the written rules don't spell out, and AutoModerator runs on rules moderators keep on a moderator-only wiki page. A post can pass every written rule and still be held back. If you're unsure, message the moderators before you post.

Questions people ask

Where do a subreddit's rules come from?: Each community writes its own and lists them on its page, under Rules in the sidebar on reddit.com or the About tab in the app. This tool reads that same list. Reddit's own rules apply everywhere on top of them (Reddit Rules).
Can it tell me for sure my post won't be removed?: No. A moderator decides, and many communities also run AutoModerator, which applies rules its moderators write on a moderator-only wiki page (Reddit Help). We can't read that page, so this tool checks the written rules only.
Why does it say a rule is about my account?: Some rules are about the poster, not the post: karma, how old the account is, how often you've posted there. Nothing in a post shows those, so we list them for you to check on your own profile instead of guessing.
What does "might break" mean?: The post touches the rule, but whether it crosses the line depends on how a moderator reads it. Rewrite that part, or message the moderators and ask before you post.
Is my post saved?: Yes, with the result, so the link you share shows the same answer. Anyone with the link can read it. We keep it for 7 days.
Does it work for comments?: It's built for posts. Rules a community marks as only about comments are listed but not checked.

Sources

Each result quotes the community's rules as Reddit showed them on the date in the result; the facts on this page come from the pages below, read on the date shown. Reddit changes them; tell us if something here is out of date.

Reddit Help: Automoderator read November 10, 2026
Reddit Rules read November 10, 2026

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