Facebook Character Limits 2026: Every Field Explained

Facebook allows up to 63,206 characters in a single post — the highest limit of any major platform — but the feed truncates visible text after roughly 477 characters on desktop, and ads have far stricter caps. Here's every Facebook character limit for 2026, field by field.

Facebook Post Character Limit: 63,206

Facebook posts can run up to 63,206 characters — equivalent to roughly 10,000 words. In practice, this limit rarely matters: the feed truncates posts with a "See more" link after approximately 477 characters on desktop and around 125 characters on mobile. Engagement data consistently shows posts under 80 characters receive the highest interaction rates.

Facebook Character Limits by Field

For the complete interactive reference with all fields for every platform, visit our all-platforms character limit cheat sheet — with 16 platforms in one page and links to dedicated tools for each.

Why Facebook's Ad Limits Are So Much Stricter Than Its Post Limits

Facebook ad headlines are capped at just 40 characters — among the strictest limits in digital advertising, giving you roughly 6-8 words. The ad primary text field technically allows more, but only the first 125 characters display reliably across mobile placements, which is why that's treated as the practical limit. Organic posts, by contrast, are essentially unlimited because Facebook wants to encourage long-form storytelling and detailed discussion in the feed, where the "See more" mechanism handles length gracefully.

Facebook Bio and Page Fields Are Indexed for Search

Page names (75 characters) and usernames (50 characters) are indexed by Facebook's internal search engine, so including a relevant keyword — where it reads naturally — can improve discoverability. The same applies to a Page's short description (255 characters), which functions similarly to a meta description: written for both search visibility and human readers.

Ideal Facebook Post Length for Engagement

• 40–80 characters: highest engagement rate for standalone status posts
• 80–160 characters: works well for link shares with added context
• 500+ characters: appropriate for storytelling and thought leadership, but typically sees lower organic reach

For Facebook's advertising-specific limits, see our Facebook Ads character limits guide, and for the data behind post length, our ideal Facebook post length guide. Compare against Instagram caption length, Twitter/X limits, and the full social media character limits guide. If you also run Google Ads alongside Facebook, see our Google Ads copy tips and meta description SEO guide.