The Facebook post character limit is 63,206 characters. Comments cap at 8,000. Your bio gets 101 characters, and ad headlines top out at 40. Those are the numbers that matter most, but Facebook has over a dozen different fields with different ceilings — and the practical limits for engagement are far lower than the technical ones.
Below is every Facebook character limit in one place, current for 2026.
Every Facebook character limit (2026)
| Field | Limit | Notes |
|---|---|---|
| Post (personal/Page) | 63,206 characters | Same for text, link, and photo posts |
| Comment | 8,000 characters | Includes replies to comments |
| Bio / Intro | 101 characters | The short "Intro" on your profile |
| Page description | 255 characters | The "About" blurb on a Facebook Page |
| Ad headline | 40 characters | Recommended; truncates after 40 on most placements |
| Ad primary text | 125 characters | Text above the image; truncates after 125 with "See More" |
| Ad description | 30 characters | The link description below the headline |
| Messenger message | 20,000 characters | Per message in Messenger and Messenger Lite |
| Story text overlay | ~200 characters | No hard cap published; practical limit before text overflows the screen |
| Group name | 75 characters | |
| Event name | 64 characters | |
| Event description | 5,000 characters | |
| Username | 50 characters | Minimum 5; only letters, numbers, and periods |
| Profile name | 50 characters | First + last combined |
Everything above is sourced from Facebook's own advertiser documentation and Help Center, cross-checked against what the platform actually enforces when you type.
The 63K limit is misleading — here's why
Yes, Facebook technically lets you write 63,206 characters in a single post. That's roughly 10,000 words. Nobody should do this.
Facebook's own internal research and third-party studies consistently show that engagement peaks at about 40-80 words for organic posts. Posts under 80 characters get 66% more engagement than longer ones, according to data from multiple social media analytics platforms. After the first few lines, Facebook hides the rest behind a "See more" link — and most people never tap it.
The 63,206 number matters for edge cases: pasting a long-form article, sharing detailed event information, or running a group where members post lengthy updates. For everyday posting, treat 400-500 characters as your working ceiling and front-load your point in the first two lines.
Comments: 8,000 characters and counting rules
Facebook comments allow up to 8,000 characters, which is generous compared to most platforms. A few things worth noting:
- Emoji count as characters. Most emoji are 1-2 code points, but some (skin-toned, family combos) can be 7-11. If you're pushing the limit, emoji inflate your count.
- Links take their full URL length. Unlike Twitter, Facebook doesn't shorten URLs in comments. A 200-character link eats 200 characters of your 8,000.
- Mentions and hashtags count too. Tagging someone as "@John Smith" costs those characters.
If you regularly write long comments — product reviews, group discussions, detailed feedback — checking the count before posting saves you from the silent truncation. The character counter handles this.
Bio and Page description — smaller than you'd expect
The Facebook bio ("Intro" on your profile) is tight at 101 characters. That's shorter than a tweet. You get one line to describe yourself, and it shows up directly on your profile without any "read more" expansion.
Page descriptions are more generous at 255 characters, but they're still short enough that every word needs to earn its place. This is the text that appears in search results and when someone shares your Page, so it functions as your elevator pitch.
