Why character limits matter for every post you write
Social media character limits aren’t just technical constraints — they shape how you communicate. Twitter’s 280-character limit forced brevity that became a defining feature of the platform. LinkedIn’s longer limit encourages more professional, detailed posts. Understanding the limits for each platform helps you write posts that work within the format rather than fighting against it.
Going over a limit means your post gets truncated (the platform cuts it off with a “read more” prompt) or rejected entirely. Going significantly under the limit on platforms that reward longer content (LinkedIn, Facebook) leaves engagement potential on the table.
Track your character count in real time with Post Character Counter.
Twitter / X
Posts (tweets): 280 characters for standard accounts. X Premium subscribers get 25,000 characters for long-form posts.
Replies: 280 characters
Bio: 160 characters
Display name: 50 characters
Username (handle): 4-15 characters
Note: URLs always count as 23 characters regardless of actual length, due to Twitter’s URL shortener. Images, videos, and polls don’t count toward the character limit.
Practical tip: Keep tweets under 240 characters if possible. Studies consistently show that tweets with some space remaining — not right up against the limit — receive more retweets. The “read more” truncation at 280 characters signals that the tweet was too long to fit.
Posts: 3,000 characters for standard posts; 700 characters before the “see more” truncation on desktop
Articles: 110,000 characters (essentially no practical limit)
Headline: 220 characters
About/Summary: 2,600 characters
Comments: 1,250 characters
Message: 8,000 characters
Practical tip: LinkedIn’s algorithm rewards posts that keep users on the platform. Posts between 1,000 and 1,300 characters tend to perform well — long enough to provide value, short enough to be read without clicking “see more”. Start with a strong first line since only the first two lines show before truncation.
Caption: 2,200 characters; first 125 characters shown before truncation
Bio: 150 characters
Comments: 1,000 characters
Username: 30 characters
Hashtags: 30 per post (more reduces reach)
Practical tip: Instagram captions front-load importance — the first 125 characters need to hook the reader. Use the remaining space for hashtags and additional context. Line breaks and spacing improve readability significantly on Instagram.
Posts: 63,206 characters
Comments: 8,000 characters
Page name: 75 characters
Event name: 64 characters
Practical tip: Facebook shows the first 477 characters of a post before the “See More” link. Posts between 40 and 80 characters get 86% higher engagement on average according to Facebook’s own research — short and specific outperforms long-form on standard posts.
YouTube
Video title: 100 characters (70 characters shown in most placements)
Video description: 5,000 characters; first 200 characters shown without expanding
Channel description: 1,000 characters
Comments: 10,000 characters
Tags: 500 characters total across all tags
Practical tip: YouTube titles are critical for both search and click-through rate. Keep titles under 70 characters to avoid truncation in search results. Front-load the main keyword.
TikTok
Video caption: 2,200 characters
Bio: 80 characters
Comments: 150 characters
Practical tip: TikTok captions serve more as supplementary context than the main content delivery (the video does that). Captions with 1-3 relevant hashtags and a direct call to action tend to outperform longer captions.
Building a cross-platform posting workflow
Writing one post and adapting it for multiple platforms is more efficient than writing separately for each. A few principles:
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Write for the most restrictive platform first — Twitter’s 280 characters forces you to distill your message to its core. Expand from there for other platforms.
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Adjust the hook — Different platforms reward different opening styles. Twitter benefits from bold statements. LinkedIn from questions or insights. Instagram from visual descriptions.
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Platform-specific formatting — Line breaks and bullet points work well on Instagram. Hashtags are essential on Instagram and TikTok, optional on Twitter, and generally discouraged on LinkedIn. LinkedIn uses
#differently (as topic tags) rather than for discoverability. -
Check counts before posting — A post that’s fine on LinkedIn might be over the limit on Twitter. Always check.
Use Post Character Counter to track counts across all major platforms simultaneously as you write.