Check your Facebook character limits in real time
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Quick Answer: All Limits at a Glance
Facebook has separate character limits for different content types. Here is the complete reference table:
| Field | Limit |
|---|---|
| Post | 63,206 chars |
| Comment | 8,000 chars |
| Bio / About | 101 chars |
| Page Short Description | 255 chars |
| Page Name | 75 chars |
| Username | 50 chars |
| Event Description | 2,000 chars |
| Ad Headline | 40 chars |
| Ad Primary Text | 125 chars (visible) |
| Ad Description | 30 chars |
| Group Name | 75 chars |
Facebook Post Limit (63,206 Characters)
Facebook posts can technically be up to 63,206 characters — about 12,000 words. In practice, this is effectively no limit at all. The constraint that matters far more than the technical cap is the engagement data.
Facebook's own internal research and independent studies from Sprout Social and BuzzSumo consistently show that posts under 80 characters receive 23% more engagementthan longer posts. The feed displays roughly 3 to 4 lines of text before truncating with a “See more” button — so your opening line carries the full weight of the post in most people's feeds.
This does not mean long posts never work. Longer posts of 300 to 500 characters perform well when the content itself earns the read: personal stories, detailed tutorials, and thought leadership pieces. But these require a strong first sentence that makes the truncation feel frustrating to users — which is exactly the reaction you want.
Facebook Ad Character Limits
Facebook advertising has the tightest character limits on the platform — and they matter more than anywhere else because every character directly affects conversion rates.
Headline: 40 Characters
The ad headline cap of 40 characters is among the strictest limits in digital advertising. With 40 characters you get roughly 6 to 8 words. That is barely enough for a subject and a verb, which means every word must earn its place.
Best-performing ad headlines share a few traits: they lead with the benefit (not the brand name), they use a number when possible (“Save 30%” outperforms “Save money”), and they use active language. Avoid headline formulas that waste characters on filler like “Introducing the new...”
Primary Text: 125 Characters (Practical Limit)
The primary text field technically accepts more than 125 characters, but only the first 125 charactersare shown reliably across all Facebook and Instagram ad placements — including mobile News Feed, Stories, and Audience Network. Anything beyond 125 characters may be truncated with a “See more” link.
Your core message and call to action must fit inside those 125 characters. Treat the rest as bonus space for users who actively click through — helpful for legal disclaimers or additional detail, but not for your main selling point.
Ad copy character budget example
Use the Facebook Ad Copy checker to draft all three side-by-side.
Ad Description: 30 Characters
The ad description field appears below the headline in some Facebook ad formats. At 30 characters, you have about 5 words. Use it for a secondary benefit, a guarantee, or social proof — something that reinforces the headline rather than repeating it.
Bio and Page Limits
The Facebook bio (About section on personal profiles) allows 101 characters. That is enough for one clear, specific sentence. Vague bios like “Living my best life” waste this space. A stronger bio names what you do and who you do it for: “Marketing consultant helping e-commerce brands scale paid social.” (72 characters)
Facebook Pages get more room. The short description field allows 255 charactersand appears in search results and when someone hovers your page name in the feed. This is the equivalent of your page's meta description — write it with search keywords in mind as well as human readers.
Page names and usernames (75 and 50 characters respectively) are indexed by Facebook's internal search engine. Including your primary keyword in your page name — when natural — can improve discoverability. Avoid keyword stuffing, which violates Facebook's naming policies.
Comments, Events, and Groups
- Comments (8,000 characters):Facebook comments allow up to 8,000 characters — far more than most social platforms. The practical limit for engagement is much lower. Facebook's algorithm surfaces shorter, more direct comments higher in threads. Aim for 1 to 3 sentences for comments that drive replies.
- Event Description (2,000 characters): Facebook event descriptions allow 2,000 characters. Put the essential details — date, time, location, and RSVP link — in the first 100 characters. Event previews and shares truncate the description, so anyone seeing a share will only see that opening.
- Group Names (75 characters):Group names appear in Facebook search, member suggestions, and sharing. A descriptive group name that includes the topic (“Content Marketing Strategy for B2B SaaS”) ranks better in discovery than a branded name alone.
Writing for Facebook in 2026
Write the first sentence as a standalone
Your first sentence is the only sentence most people will read. It appears in the feed before 'See more'. Write it so that even if no one clicks through, they still get value or a reason to engage.
Match length to content type
Short posts (under 80 chars) work for announcements, quotes, and conversation starters. Medium posts (80–300 chars) work for link shares with context. Long posts (300+) work for stories and detailed updates — but only if you can open with a hook that earns the scroll.
For ads, draft in a counter first
Facebook Ads Manager does not give you a live character count for all fields. Draft your headline, primary text, and description in the Facebook Character Limit Checker before pasting them in. Getting the count wrong after a campaign launches means paid traffic hitting a truncated message.
Use the bio for searchability
Facebook's internal search indexes bio text. Include one or two keywords that describe what you do. Combined with a clear call to action, a keyword-rich bio improves both discovery and conversion when someone lands on your profile.
Check your Facebook limits before you publish
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Open Facebook Character Limit CheckerFrequently Asked Questions
Facebook posts can be up to 63,206 characters long. In practice, this is no real limit for most use cases. However, engagement data shows that posts under 80 characters consistently receive more reactions, comments, and shares than longer posts. The feed truncates posts with a 'See more' link after approximately 3 to 4 lines of text.
Facebook ad headlines are limited to 40 characters. This is one of the shortest character limits in digital advertising. Lead with a clear benefit, use active language, and include a number if possible. For example, 'Save 30% on your first order' uses 31 characters and communicates immediate value.
The Facebook ad primary text field allows up to 125 characters before it is truncated in most ad placements. While the field technically accepts more, only the first 125 characters are reliably shown across mobile News Feed, Instagram placements, and Audience Network. Write your core message and CTA within the first 125 characters.
The Facebook bio (About section) has a limit of 101 characters. This applies to personal profiles. For Facebook Pages, the short description field allows up to 255 characters. Both are indexed by Facebook's search and appear in profile previews.
Research by Sprout Social, BuzzSumo, and Facebook's internal data shows that posts of 40 to 80 characters get the highest engagement rates. Posts of 80 to 160 characters work well for link shares with added context. Long-form posts above 500 characters can work for storytelling and thought leadership but typically see lower organic reach due to how the algorithm weights brevity.
Yes, Facebook comments are limited to 8,000 characters per comment. This is generous enough for detailed replies, but Facebook's ranking algorithm tends to surface shorter, more direct comments higher in threads. For maximum visibility, keep comments to 1 to 3 sentences.