Social Media Character Limits 2026: Every Platform's Rules

Why Character Limits Matter

Every social platform enforces character limits on posts, bios, comments, and captions. Exceeding them means your content gets truncated, rejected, or hidden behind a "see more" fold. Knowing the limits lets you craft posts that display fully, fit within algorithmic sweet spots, and communicate effectively within each platform's culture.

Character limits also affect SEO and social sharing. Meta descriptions, Open Graph titles, and Twitter card text all have length constraints that affect how your content appears in search results and social feeds.

X (Twitter)

Posts: 280 characters for free accounts, 25,000 characters for Premium subscribers. URLs count as 23 characters regardless of actual length (Twitter's t.co link shortener). Images, videos, polls, and quote tweets don't count toward the character limit.

Bio: 160 characters. Display name: 50 characters. Username: 15 characters.

Optimal length: Posts between 71–100 characters tend to get the highest engagement rates. Threads (multi-post sequences) perform well for long-form content — keep each post self-contained enough to work if someone sees it individually.

Instagram

Captions: 2,200 characters maximum, but only the first 125 characters display before the "more" fold in the feed. Front-load your most important message.

Bio: 150 characters. Username: 30 characters. Hashtags: Up to 30 per post, 10 per Story.

Comments: 2,200 characters. Reels captions: 2,200 characters. Alt text: 100 characters.

Optimal length: Captions between 138–150 characters get the best engagement for feed posts. For educational or story-driven content, longer captions (1,000–2,000 characters) can perform well if the hook is strong.

LinkedIn

Posts: 3,000 characters. Only the first ~140 characters display before the "see more" fold — your hook needs to land in those first two lines.

Articles: 125,000 characters (LinkedIn's long-form publishing platform). Comments: 1,250 characters.

Headline: 220 characters. Summary/About: 2,600 characters. Company page description: 2,000 characters.

Optimal length: Posts between 1,200–1,600 characters tend to drive the most engagement on LinkedIn. The platform's algorithm favors posts that generate comments, so ending with a question or call-to-action helps.

Facebook

Posts: 63,206 characters — effectively unlimited for practical purposes. But only the first ~477 characters display before the "see more" link.

Comments: 8,000 characters. Page description: 255 characters. Ad primary text: 125 characters recommended (up to 1,024).

Optimal length: Posts between 40–80 characters get the highest engagement on Facebook. Short, conversational posts outperform long-form content on this platform.

TikTok

Captions: 4,000 characters (increased from 2,200 in 2024). Hashtags are included in this limit.

Bio: 80 characters. Username: 24 characters. Comments: 150 characters.

Optimal length: TikTok captions are secondary to the video content. Keep them under 150 characters for most videos. Use the full 4,000 characters for SEO-optimized educational content where text context adds discovery value.

Threads

Posts: 500 characters. Images: Up to 10 per post. Videos: Up to 5 minutes.

Bio: Synced from Instagram (150 characters). Username: Synced from Instagram (30 characters).

Optimal length: Threads favors concise, conversational content. Posts under 200 characters tend to perform best. The platform's text-first design means every character needs to earn its place.

YouTube

Video titles: 100 characters, but only ~70 display in search results. Keep titles under 60 characters for full visibility.

Descriptions: 5,000 characters. The first 150 characters appear in search results — front-load keywords and your value proposition.

Comments: 10,000 characters. Channel description: 1,000 characters. Playlist titles: 150 characters.

Optimal length: Titles between 47–60 characters perform best in search. Descriptions should be at least 200–300 words for SEO, with timestamps and links below the fold.

Optimal Post Lengths by Platform

Research and engagement data consistently show that shorter posts outperform longer ones on most platforms — but "shorter" means different things on different platforms.

The pattern across all platforms: front-load your message. Algorithms show truncated previews, and users scroll fast. Your first line is your headline — make it count.

Use the Social Character Counter tool to check your content against every platform's limits in real time. Paste your text and instantly see which platforms will truncate it, where the fold falls, and how many characters you have remaining.