Facebook Character Limit Checker
Check Facebook character limits in real time. Switch between Post, Ad Copy, and Bio modes to track exactly what fits within each Facebook limit.
63,206 characters left
0 words
Engagement tip: Posts under 80 characters get 3x more engagement. Your post is under 80 — great!
All Facebook Character Limits
| Field | Limit | Best Practice |
|---|---|---|
| Post | 63,206 characters | Under 80 chars gets 23% more engagement |
| Comment | 8,000 characters | 1–3 sentences performs best |
| Bio / About | 101 characters | One strong sentence |
| Page Name | 75 characters | Keep it concise and searchable |
| Username | 50 characters | Letters, numbers, periods only |
| Event Description | 2,000 characters | Include key details in first 100 chars |
| Ad Headline | 40 characters | Lead with benefit, not brand name |
| Ad Primary Text | 125 characters | First 125 shown across all placements |
| Ad Description | 30 characters | Appears below headline in some formats |
| Group Name | 75 characters | Descriptive names rank better in search |
Facebook Character Limits Explained
Facebook's post limit of 63,206 characters is technically generous, but the platform's algorithm treats length as a negative signal for organic reach. Posts under 80 characters consistently outperform longer ones in engagement studies. The feed shows about 3 to 4 lines of text before truncating with “See more” — so your first sentence is doing most of the work.
For Facebook ads, limits are far tighter and far more consequential. The ad headline cap of 40 characters is among the strictest in paid social. With 40 characters you get roughly 6 to 8 words — enough for a clear benefit statement, a number, and a verb. The primary text limit of 125 characters is the practical truncation point across mobile placements, even though the field technically allows more.
The bio limit of 101 characters forces clarity. Treat it like a Twitter bio from the pre-280 era: one sentence, one clear message. Page names and usernames have separate limits (75 and 50 characters respectively) and are indexed by Facebook's internal search, so keyword relevance matters.
Use the Ad Copy mode in the tool above to draft headlines and primary text side-by-side before pasting into Facebook Ads Manager. Getting character counts right before launching saves costly revision cycles once a campaign is live.
Facebook posts can be up to 63,206 characters long — effectively no practical limit for most writers. However, Facebook's own data shows that posts under 80 characters receive 23% more engagement than longer ones. For best results, keep posts concise and use the space for genuine storytelling rather than keyword stuffing.
Facebook ad headlines are limited to 40 characters. This is one of the tightest limits in digital advertising. Every character counts — lead with the benefit, not the brand name. Use active verbs and numbers where possible (e.g., 'Save 30% Today' uses 14 characters and communicates immediate value).
The Facebook bio (About section) allows up to 101 characters. This is enough for one strong sentence that describes who you are or what your page offers. Prioritize clarity over cleverness — visitors scan bios in under 3 seconds.
Yes, Facebook comments are limited to 8,000 characters. This is generous enough for detailed replies, but Facebook's algorithm tends to surface shorter, more direct comments higher in threads. Aim for 1 to 3 sentences for comments that drive engagement.
Research by BuzzSumo and Facebook's own data consistently shows that posts of 40 to 80 characters get the highest engagement rates. Posts between 80 and 160 characters perform well for link sharing. For video posts, captions under 100 characters are optimal. Long-form posts above 500 characters work for storytelling but get significantly less organic reach.
Facebook ad primary text (the main body copy above the image) is limited to 125 characters before it gets truncated in most placements. The full limit is higher, but only the first 125 characters are reliably shown across all ad placements on mobile and desktop. Write your key message and CTA within the first 125 characters.