Free tool
Reddit post checker
Check a Reddit title and body for length, links, self-promo phrases and all caps, and preview your markdown before you post. It has two modes: “One post” checks a single title and body, and “Recent posts and comments” takes several of your own posts or comments, separated by a line with only ---, and counts how many contain links or promotional wording. It does not write posts. It is free, runs in your browser, uses no AI and sends nothing anywhere, and it cannot read your Reddit profile, so you paste the text in yourself. For posts drafted in your own voice, use the composer in Reply Monk, which can check drafts against your notes for each subreddit.
Free plan · 20 replies or posts a month · No card needed
0 / 300
0 / 10,000 characters. Stays in your browser.
Checklist
Add a title or some body text to see the checks.
Markdown preview
Your formatted body shows here.
A basic preview: paragraphs, bold, italics, lists, quotes and links. Reddit needs a blank line between paragraphs, and each subreddit may style things differently.
These are general habits, not a promise your post will stay up. Read the subreddit’s own rules first. Reply Monk lets you keep subreddit notes and checks drafts against them in the composer.
Separate each post or comment with a line that contains only ---. We cannot read your Reddit profile, so copy the text in yourself. Stays in your browser.
Type your domain and we mark the items that link to it.
Results
Paste at least one post or comment to see the results.
How to use it
- Type your title and paste your body text.
- Read the checklist. Fix anything marked with a warning.
- Check the markdown preview, then read the subreddit’s own rules before you post. They always win.
Tips
- Read the community’s rules and sticky posts first. Each one is different.
- Lead with the problem or the question, not with your product.
- One link at most, and only where it helps. Many communities remove posts that are mostly links.
- Give enough context that someone could answer without asking you three follow-up questions.
Questions
Good to know
Will passing these checks keep my post up?
No. Every subreddit has its own rules and moderators, and this tool only checks general habits. Always read the community’s rules first.
How long can a Reddit title be?
Up to 300 characters. Shorter, specific titles usually read better.
Does my text leave my browser?
No. The checks and the preview run in your browser, and nothing is sent anywhere.
Can the tool check my Reddit profile for me?
No. It cannot see your profile and makes no network calls, so you copy in the posts and comments you want checked. Everything is worked out in your browser and nothing is stored or sent.
What counts as promotional in the recent posts check?
An item counts as promotional if it uses common promotional phrases such as “check out my”, “I built”, “sign up” or “DM me”, or if it links to the site you typed in. It is a rule of thumb, not a verdict. Rules about self-promotion and links differ between subreddits, so always read each community’s rules.
Can Reply Monk check against a subreddit’s rules?
Yes, inside the app. You can keep notes for each subreddit (rules, self-promo limits, banned phrases) and drafts are checked against them. See Reply Studio and the composer.
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Show up this week, in your own voice.
Set up your voice in a few minutes, then write your first post or reply. You stay in control of every word.
Free plan · 20 replies or posts a month · No card needed