This free Reddit character counter checks every surface you write on Reddit, from post titles and long-form bodies to comments, bios, flairs, and subreddit fields. It updates as you type, shows you exactly how many characters you have left, and warns you before you hit a limit. No account. No install. Nothing to sign up for.
Reddit has more distinct character limits than any other social platform in existence. A post title caps at 300 characters and is permanent the moment you publish. The body of a text post goes up to 40,000 characters (80,000 if you have Reddit Premium). Comments cap at 10,000. Bios sit at 200. Flairs at 64. Subreddit names at 21 and they are also permanent. Usernames at 20 and they cannot be changed. Each field has a different number, a different rule, and a different consequence if you get it wrong.
This page covers all of them in one place, with verified limits, the real engagement data competitors repeat wrong, and a complete reference for casual users, active community members, moderators, and advertisers alike.
Every Reddit Character Limit: 2026 Reference Table
Below is the complete field reference, verified against Reddit's official support documentation and API changelog. Bookmark this table if nothing else.
| Field / Surface | Hard Limit | Key Note |
|---|---|---|
| Post title | 300 chars | Permanent after posting. Cannot be edited. Ever. |
| Post body (standard) | 40,000 chars | Applies to all standard Reddit accounts |
| Post body (Reddit Premium) | 80,000 chars | Doubled in the November 4, 2025 Reddit changelog |
| Comment | 10,000 chars | Applies to top-level comments and all replies |
| Direct Message (DM) | 10,000 chars | Same ceiling as a comment |
| Chat message (real-time) | ~4,000 chars | Reddit's live chat feature, not DMs |
| Profile bio | 200 chars | Markdown links work here: [text](url) costs ~25+ chars |
| Display name | 30 chars | Editable at any time. Spaces and special chars allowed |
| Username | 3–20 chars | Letters, numbers, underscores, hyphens only. Permanent. |
| User flair | 64 chars | Subreddit-controlled. Emoji shortcodes count toward limit |
| Post flair | 64 chars | Required in many subreddits. Set by moderators |
| Subreddit name | 3–21 chars | Letters, numbers, underscores only. Permanent URL. Cannot change. |
| Subreddit description (short) | 500 chars | Shows in Google search results. Most important mod field |
| Subreddit rule title | 100 chars per rule | Maximum 15 rules per subreddit |
| Subreddit rule description | 500 chars per rule | Full explanation per rule |
| Old Reddit sidebar | 10,240 chars | One combined Markdown field on legacy Reddit |
| Wiki page body | 524,288 chars | Roughly 80,000 words per wiki page |
| Ad headline (all formats) | 300 chars | Reddit recommends 100 or fewer. Mobile truncates near 80 |
| Ad carousel caption (per image) | 50 chars | Optional caption per image; headline follows the standard 300-char ad limit |
| Ad destination URL | 268 chars | Verified from official ad specs; one per image in carousels |
| Ad display URL | 100 chars | Shown instead of the raw URL; must match the destination domain |
| Reddit Max headline | 300 chars (rec. ≤ 50) | AI tests 3–15 headline variants you supply; 5+ variants recommended |
| Link post URL | 2,048 chars | Practical browser-safe maximum — Reddit publishes no official cap for organic link posts |
Source verification: the post body limit is confirmed via Reddit developer documentation and the native composer (40,000 standard). The Premium upgrade (80,000) is confirmed in the official Reddit changelog dated November 4, 2025. Ad limits are verified from Reddit's business help center at business.reddithelp.com, checked Q3 2026. Third-party scheduling tools such as Buffer and some API wrappers may enforce a lower 30,000-character body limit on their own side — that is a tool-side restriction, not Reddit's native limit. Always use Reddit's own composer as the final authority.
Reddit Post Title Character Limit: 300 Characters
The Reddit post title allows up to 300 characters. That sounds generous. It is not as generous as it feels, because a title is the only field on Reddit that is completely permanent from the moment you press submit.
Why the title is the highest-stakes field on the platform
Every other piece of content you write on Reddit can be changed. You can edit your comment. You can edit the body of a text post. You can update your bio, change your flair, and rename everything that can be renamed — except the title. The post title is locked at the moment of submission. There are no exceptions and no workaround Reddit provides to fix it.
If you post a title with a typo, a missing word, or a character count that gets truncated in certain apps, your options are:
- Delete the entire post and repost with a corrected title, losing every upvote, comment, award, and cross-post the original had collected
- Leave the error visible permanently
For a post that is gaining traction in a large subreddit, deleting it can mean losing thousands of upvotes. For a community manager, it means restarting a discussion thread and hoping the algorithm picks it up again. For an advertiser testing organic reach, it resets the algorithm clock to zero. No other character limit decision on Reddit carries this kind of consequence.
What engagement data actually says about title length
In March 2026, upvote.net published two separate analyses: one of 1,000 posts from r/all and one of 1,982 posts pulled from the 20 largest and most active subreddits. A third, larger dataset — an analysis of 37,717 organically-ranking Reddit posts published the same month — reached the same conclusion about length. The key findings on title length:
- Titles longer than 150 characters earned the highest median upvote counts in both the 1,000-post and the 1,982-post datasets
- The 37,717-post dataset found titles in the 160–180 character range earned the highest average upvotes (91,657), while titles under 80 characters averaged 86,078 — the exact reverse of the conventional advice
- One dataset found question-style titles underperformed declarative titles by 16 percent; the 37,717-post dataset found question and statement titles within one percent of each other. The honest read: question framing is not the decisive factor — specificity is
- No dataset in any of these studies supported the "keep titles under 80 characters" advice that most SEO guides repeat without evidence
- The often-cited 6 to 12 word bracket was the weakest-performing length range in the dataset
When two March 2026 datasets agree on length and disagree on question framing, trust the agreement. Longer, specific titles outperform short vague ones, and the effect is large enough to plan around. This does not mean you should pad every title to 160 characters. It means the conventional advice is wrong, and the right title length depends on the subreddit, post type, and what you are trying to communicate. Lead with the most important information. Put the core idea in the first 70 to 80 characters so it reads cleanly on mobile without wrapping. Then use the remaining budget for specifics, context, and qualifying details.
Your Reddit title is now a Google listing
The 300-character title has quietly become an SEO surface. Reddit now appears in 97.5 percent of Google product-review queries, and a February 2026 analysis found Reddit results surfacing in roughly 37 percent of all Google search results pages. Google gives Reddit threads their own "Posts on Reddit" treatment in many queries, and Google rewrites or truncates result titles around 60 characters in most layouts. That means the first 60 characters of your Reddit title are effectively a headline in Google's search results — permanently, because you cannot edit the title after posting.
The practical workflow: front-load the searchable phrase (the product name, the error message, the question someone would actually type) inside the first 60 characters, keep the full specific context in the remaining 240, and count before you submit. No other character counter page connects these two facts — which is exactly why a title that clears Reddit's limit can still fail Google's truncation window.
What counts toward the 300-character title limit
- All letters, numbers, and spaces: one character each
- All punctuation marks and symbols: one character each
- Emoji: generally one character each on Reddit (unlike Twitter, Reddit does not apply weighted emoji counting)
- Bracketed tags such as [OC], [Serious], [Discussion], [NSFW]: every character including the brackets counts
- Subreddit-specific required tags in the title: these eat into your budget and are mandatory in many communities
Subreddit rules can make the title limit stricter
Reddit's 300-character global title limit is a ceiling, not a guarantee. Individual subreddits can enforce a lower maximum or a minimum title length through Reddit's post_requirements API endpoint. A subreddit moderating with strict rules might cap titles at 150 characters. If your title passes this counter at 280 characters and gets rejected by a specific subreddit, check that community's sidebar rules for title length restrictions before assuming a Reddit platform error.
Post types that share the 300-character title limit
- Text posts (self posts)
- Link posts
- Image posts
- Video posts
- Poll posts — polls support 2 to 6 answer options with voting open from 1 day up to 1 week; the poll question lives in the same 300-character title, and option labels are separate fields with no officially documented per-option limit, so keep them short to render fully on mobile
- Crosspost titles
The 300-character limit applies identically to every post type on Reddit. The body field is a different matter for link and image posts, but the title is always 300.
Reddit Post Body Character Limit: 40,000 Characters (80,000 for Reddit Premium)
The body of a Reddit text post (called a self post) allows up to 40,000 characters for standard accounts. That is roughly 6,000 to 8,000 words depending on your average word length and how much Markdown formatting you use. If you draft long-form in words or minutes instead of characters, the Word Counter and the Reading Time Calculator convert between the units — the Post Body tab above shows words and reading time live alongside the count. Reddit Premium subscribers have a doubled limit of 80,000 characters, a change confirmed in the official Reddit changelog published on November 4, 2025.
40,000 characters is the largest post-body limit of any major social platform. Facebook allows 63,206 characters for page posts, but individual users rarely approach it. Twitter and X cap at 280 characters for standard accounts. Instagram allows 2,200. Reddit's text post body is in a category of its own for long-form community content.
The November 2025 Reddit Premium upgrade
The Premium limit is rarely discussed by competitors and almost never reflected in their tools. At 80,000 characters (approximately 12,000 to 13,000 words), Reddit Premium gives you enough space for a short story, a comprehensive research write-up, or a deeply detailed AMA response within a single post body. Standard accounts still have 40,000, which is already enormous by any social media standard. The Post Body tab above includes a Standard / Premium toggle so you can count against the limit that actually applies to your account.
The third-party API discrepancy: 30,000 vs 40,000 characters
The hidden cost of Markdown formatting
This is the most practically important thing about the post body limit that no competing tool or guide explains: Markdown formatting characters count toward the limit, and they are invisible in the final rendered post.
When you write a Reddit post in Markdown mode, every asterisk, bracket, caret, and backtick counts as a character in the raw text. The rendered post shows you bold text, links, and quotes. The character counter sees the raw syntax. Here is what that costs:
| Formatting | Markdown Syntax | Extra Characters Added |
|---|---|---|
| Bold | **word** (two asterisks each side) | +4 characters |
| Italic | *word* (one asterisk each side) | +2 characters |
| Bold + italic | ***word*** (three each side) | +6 characters |
| Strikethrough | ~~word~~ (two tildes each side) | +4 characters |
| Inline code | `word` (one backtick each side) | +2 characters |
| Link | [anchor text](https://example.com) | +URL length + 4 characters |
| Block quote | > text (greater-than + space) | +2 characters per quoted line |
| Heading H2 | ## Heading (hash-hash + space) | +3 characters |
| Spoiler tag | >!text!< (Reddit-specific) | +4 characters |
| Superscript | ^(text) (caret + parentheses) | +3 characters |
A heavily formatted post with 20 bolded phrases, 10 hyperlinks averaging 30 characters each, and 5 subheadings consumes roughly 380 extra characters before a single word of content is written. A comment structured as a mini-guide with headers, bullet formatting characters, and multiple links can have 500 to 700 characters of formatting overhead in a 3,000-character reply. This counter measures raw character count exactly the way Reddit does, including all Markdown syntax.
What the new Reddit rich text editor changes
Reddit's default desktop composer is a rich text editor, not a Markdown editor. When you write in the rich text editor, formatting is applied invisibly and the raw stored text may look different. Switching to Markdown mode (the "Markdown" or "Switch to Markdown Editor" option in the composer toolbar) shows you the raw character representation. This counter matches the Markdown mode character count because that is what Reddit stores and counts against the limit.
Practical length guidance by subreddit type
- News and link-driven subreddits (r/worldnews, r/news): keep the body short or leave it empty — the link and the title carry the post, and editorializing in the body is against the rules in many of these communities
- Discussion and opinion subreddits (r/changemyview, r/unpopularopinion): 300 to 800 characters is usually enough to state a clear position; walls of text get skipped before the argument lands
- Advice and help subreddits (r/personalfinance and similar): 1,000 to 3,000 characters with all relevant context up front — incomplete details generate follow-up questions instead of answers
- Specialist and long-form communities (r/askhistorians, r/askscience, r/depthub): 3,000 to 10,000 characters is normal and rewarded, provided the post is structured with headers, sources, and a TL;DR
When your post exceeds 40,000 characters
If your content genuinely exceeds the body limit, there are structured ways to handle it without losing the audience:
- Create a Part 1 and Part 2 series, linking each to the other in the first comment
- Post the overview or summary as the main post and link to a public Google Doc or your own site for the full version
- If you are a moderator, convert long reference material into a subreddit wiki page (which allows up to 524,288 characters)
- For AMAs, answer detailed questions as replies to the main post rather than stuffing everything into the body
Reddit Comment Character Limit: 10,000 Characters
Reddit comments have a 10,000-character limit. This is one of the highest comment limits of any major social platform. YouTube comments share the same 10,000-character ceiling. Twitter replies are capped at 280. Instagram comments at 2,200. Discord messages at 2,000. Comments get their own dedicated page: the Reddit Comment Character Counter opens directly on the Comment tab and adds the Markdown X-Ray and the split-at-10,000 helper for long-form replies.
The 10,000-character limit applies equally to top-level comments, replies at any nesting depth, and continuation comments in a thread. Reddit Direct Messages (DMs) share the same 10,000-character ceiling. Reddit's real-time live chat feature uses a separate, lower limit of approximately 4,000 characters.
When 10,000 characters is still not enough
If you genuinely need more space than a single comment allows, the standard Reddit practice is to post a parent comment and then reply to your own comment with a clearly labeled continuation. Include "continued below" at the end of the first comment and "continued from above" at the start of the second. Communities that regularly host long-form answers, such as r/askhistorians and r/depthub, normalize this format.
Comment length and upvote performance
The same March 2026 study that analyzed post title length found that comments of 50 to 150 words tend to get the most upvotes in most general subreddits. In specialist communities (r/askhistorians, r/askscience, r/personalfinance), thoroughly sourced long comments outperform short ones. The subreddit culture is the deciding variable, not the character count.
Markdown formatting overhead applies here exactly as it does in post bodies. A 9,000-character comment that uses heavy formatting might contain only 8,200 characters of readable text. This counter counts every character including formatting syntax, which is identical to how Reddit counts it.
Nesting depth and the collapsed comment
Reddit limits comment threading to roughly 10 levels deep on desktop before inserting a "continue this thread" link — though users report the effective depth varying from 4 to 10 levels depending on the client, view mode, and subreddit configuration. Character limits are not affected by nesting depth but visibility is. A deeply nested comment may receive fewer upvotes simply because fewer people click through to read it, not because the content is weaker.
Flair, Profile Bio, Username, and Display Name Limits
User flair: 64 characters
User flair appears next to your username in specific subreddits. It is controlled by the subreddit's moderators: some allow fully custom flair text up to 64 characters, others offer only preset options you can choose from, and others allow no flair at all. The 64-character limit includes emoji shortcodes if the subreddit has custom emoji enabled. Flair is subreddit-specific. The flair you set in r/programming does not appear in r/cooking.
Moderators creating flair templates for their communities sometimes hit the 64-character limit when translating flair into other languages, where the same concept often requires more characters. Budget accordingly when building multilingual community flair systems.
Post flair: 64 characters
Post flair categorizes content within a subreddit. Many active subreddits require post flair before submission. Common tags include [Discussion], [Question], [Tutorial], [OC] for original content, [Spoiler], [NSFW], and [Serious] for no-joke responses only. Each of these fits comfortably within 64 characters. The 64-character limit applies to custom post flair labels that moderators create. In the subreddit management panel, every flair option you build is subject to this ceiling.
Profile bio: 200 characters
Your profile bio appears on your public Reddit profile page when another user clicks on your username. It is not displayed in your comments or your posts. It is not indexed prominently by search engines. At 200 characters, you have room for a sentence or two.
Markdown link syntax works inside the bio field. Writing [My Portfolio](https://yoursite.com) uses 31 characters but displays as a clickable link. If you are a creator, developer, or professional, that link budget is worth spending. If you simply want to introduce yourself, plain text is fine.
Display name: 30 characters
The display name is a label on your profile page only. It is separate from your username and does not appear in comments or posts. It can be changed at any time. It allows spaces and special characters, which usernames do not. Most Reddit users outside of brand accounts never set a display name. If you use Reddit for professional community management, a display name that matches your brand or organization helps users who land on your profile.
Username: 3 to 20 characters, permanent
Reddit usernames allow letters, numbers, hyphens, and underscores. No spaces. No other special characters. The username is also the account URL at reddit.com/u/yourusername and appears throughout the platform.
Usernames between 8 and 15 characters tend to be easier to remember and mention in comment threads. Very short usernames (3 to 5 characters) are almost all taken. Very long ones (near 20 characters) can feel awkward when other users type them in replies. The practical sweet spot is 8 to 12 characters if you are choosing a new username today.
Subreddit and Moderator Field Limits: The Complete Reference
Reddit gives moderators a set of fields for configuring their community, and each one has its own character limit. This section is specifically for community creators, moderators, and community managers who need a complete reference for every configurable field.
Subreddit name: 3 to 21 characters, also permanent
Rules for subreddit names:
- Only letters, numbers, and underscores are allowed. Hyphens are not permitted in subreddit names (this is different from usernames, where hyphens are allowed)
- The name must start with a letter, not a number or underscore
- Case-insensitive: r/Technology and r/technology are the same community
- Must be unique across all of Reddit
- Maximum 21 characters after the r/ prefix
Well-designed subreddit names fit the concept within the limit without abbreviation: r/dataisbeautiful (16 characters), r/explainlikeimfive (17 characters), r/personalfinance (16 characters). If your first choice exceeds 21 characters, look for a shorter variant or a well-known abbreviation before creating the community.
Subreddit short description: 500 characters (the most important mod field)
The short community description appears in Google search results when someone searches for your subreddit, in Reddit's mobile app sidebar, and in the community discovery feed. It is the primary text representation of your community to users who have not yet joined.
500 characters is tight for a community description. Use every character deliberately. A strong short description states what the community is, who it is for, the primary rule or expectation, and a one-line reason to join. Run it through this counter before you publish. A description that runs over the limit is truncated silently in some views.
Subreddit rules: 100 characters per title, 500 characters per description, maximum 15 rules
Reddit allows up to 15 rules per subreddit. Each rule has a title field (100 characters) and a description field (500 characters). Rule titles appear during the post submission flow, so they need to communicate the rule clearly and quickly within 100 characters. Examples that work within the limit:
- "No personal attacks, harassment, or doxxing" (43 characters)
- "All posts must include a source or original data" (49 characters)
- "Self-promotion is limited to 10% of your post history in this subreddit" (73 characters)
- "No screenshots from social media without verifiable context" (59 characters)
Rule descriptions allow 500 characters for the full explanation, edge cases, and consequences of violations. Moderators who spend their description budget carefully reduce the number of repetitive moderation messages they have to send.
Old Reddit sidebar vs. new Reddit widgets
Old Reddit (accessible at old.reddit.com) uses a single sidebar Markdown text field with a 10,240-character limit. New Reddit replaced this with a widget-based sidebar system where each widget has its own content limit and you can stack multiple widgets. If you maintain both the old Reddit and new Reddit experiences for your community, budget your old Reddit sidebar as the binding constraint and stay inside 10,240 characters for the content that matters most.
Wiki page body: 524,288 characters
Subreddit wiki pages accept up to 524,288 characters per page body, which is roughly 80,000 words. If your community has a rules page, a glossary, a FAQ, or a resource list that you have been cramming into the sidebar, a wiki page has essentially unlimited room by practical standards. Wiki page names and edit reason fields have shorter limits that are not officially published, but in practice a wiki page name should stay under 50 characters for clean display in the wiki navigation.
Reddit Ads Character Limits: The Advertiser Reference
Reddit's advertising platform uses the same character ceilings as organic posts for most fields, but adds platform-specific truncation behavior that makes the hard limit misleading. Everything below is verified from Reddit's official business help center at business.reddithelp.com, last checked Q3 2026.
Ad headline: 300 hard limit, approximately 80 practical limit for mobile
The headline field on all Reddit ad formats accepts up to 300 characters. This matches the organic post title limit because the ad unit is designed to look like a native Reddit post in the feed. However, Reddit's own ad platform documentation states a recommended limit of 100 characters or fewer and a "safer limit" of 80 characters, because headlines beyond that range are truncated with an ellipsis on most mobile viewports.
Put your core value proposition in the first 60 characters. Everything after character 80 may not display on the most common screen sizes. A headline that dies mid-sentence because it got cut off looks broken, not premium.
Ad specs by format
| Ad Format | Headline Limit | Body / Caption Limit | Key Note |
|---|---|---|---|
| Image ad (promoted post) | 300 chars (rec. 100) | None (image carries content) | CTA button required from preset list; destination URL 268 chars |
| Video ad | 300 chars (rec. 100) | None | Same text rules as image ad; 2 sec to 15 min video length |
| Free-form ad | 300 chars (rec. 100) | 40,000 chars (body) + 50 chars caption per image or video | 3 to 6 lines of body text show in feed preview |
| Carousel ad | 300 chars (rec. 100) | 50 chars (caption per image) | 2–6 images; destination URL up to 268 chars each; display URL 100 chars |
| Max campaign (AI creative) | 300 chars (rec. ≤ 50) | N/A | Supply 3–15 headline variants; AI picks per impression |
| Conversation placement | Same 300-char headline spec; agency guides report harder mobile truncation (keep near 100) | N/A | Runs on the thread page below comments |
Ad URLs have their own limits — 268 and 100 characters
Two ad fields that no third-party spec sheet tracks correctly: the destination URL (where clicks land) is capped at 268 characters on every Reddit ad format, and the display URL (the friendly text shown in the ad) is capped at 100 characters and must match the domain of your destination URL. In carousel ads, each image carries its own destination URL, so a six-card carousel means six URLs that each fit inside 268 characters. Long tracking URLs with UTM parameters are the usual reason an ad gets rejected on this field.
Reddit Max campaigns: the 50-character headline era
Reddit Max campaigns use AI to pick the best headline, media, and call-to-action combination for every impression from the variations you supply. The specs: provide 3 to 15 headline variants (Reddit recommends 5 or more), each up to 300 characters but with a recommended length of 50 characters or fewer — noticeably shorter than the ≤ 100 recommendation for standard ads. Max campaigns support up to 20 images and 5 videos that the system mixes and matches. Because the AI rotates your headlines, every variant needs to stand alone: count each one in this tool's Ad Headline tab and treat 50 characters as the working budget.
The free-form ad opportunity
A Reddit free-form ad is the closest ad format to an actual Reddit post. It accepts a 40,000-character body, up to 20 images, and up to 5 videos, with an optional 50-character caption per image or video. In communities that actively distrust obvious advertising, a well-written free-form ad that provides real value to the subreddit reads as organic content and performs accordingly. The character limits are identical to an organic text post. You can draft and count the body using this tool's Post Body tab before moving it to Ads Manager.
What Counts as a Character on Reddit
Reddit's character counting is straightforward compared to platforms like Twitter, which apply weighted counting to URLs and emoji. Reddit uses raw character counting:
- Every letter, number, and symbol: 1 character
- Every space: 1 character
- Every line break (newline): 1 character
- Every Markdown syntax character (asterisks, brackets, carets, backticks): 1 character each, counted toward the limit
- Emoji: generally 1 character per simple emoji. Compound emoji count differently: a 👍 with a skin tone is stored as 3 code units, and a family emoji built with zero-width joiners can register as 11 characters in a raw counter. Reddit does not publish an official emoji-counting rule, and JavaScript-based counters — including this one and Reddit's own web composer — count these compound emoji as multiple characters.
The most common misconception is that Markdown formatting characters do not count. They do. The bold markers around a single word cost 4 characters. A link where the anchor text is 10 characters and the URL is 35 characters costs 49 characters total (10 + 35 + 4 for the brackets and parentheses), even though the rendered post shows only the 10-character anchor text.
This is also why different counters on the internet give you different numbers for the same text: some count visible grapheme clusters (one per emoji), some count Unicode code points, and JavaScript-based counters — including this tool and the composer Reddit actually runs in your browser — count UTF-16 code units. For plain English text all three methods agree exactly. They only diverge on compound emoji, rare scripts, and zero-width characters. This counter uses JavaScript's raw text.length method, so what you see here is the number a JavaScript-based web composer will count against your limit. If your post is stuffed with compound emoji and you are near a hard limit, leave a safety margin of a few characters.
