Social Media Character Limits: Complete Guide for All Platforms
Every social media platform enforces character limits that shape how you communicate. Knowing these limits helps you craft messages that display fully without truncation and maximize engagement.
Character Limit Trivia
Twitter's original 140-character limit was based on the SMS standard of 160 characters, minus 20 reserved for the username. When Twitter doubled the limit to 280 in 2017, only about 1% of tweets actually used the full 280 characters.
Character Limits by Platform
| Platform | Post/Message | Bio/Profile | Other Limits |
|---|---|---|---|
| X (Twitter) | 280 (free) / 25,000 (Premium) | 160 | Display name: 50 |
| 2,200 (caption) | 150 | Hashtags: 30 max | |
| 63,206 | 101 | Ad text: 125 recommended | |
| TikTok | 4,000 (caption) | 80 | Username: 24 |
| 3,000 | 2,600 (About) | Headline: 220 | |
| YouTube | 5,000 (description) | 1,000 (About) | Title: 100 |
| Threads | 500 | 150 | — |
| 500 (description) | 160 | Title: 100 | |
| Bluesky | 300 | 256 | Display name: 64 |
| 65,536 | 139 (About) | Group name: 100 |
Instagram Posting Tips
Instagram captions can be up to 2,200 characters, but only the first 125 appear before the "more" truncation. Front-load your most important message within those first 125 characters. Place hashtags at the end or in the first comment.
YouTube Description Best Practices
YouTube descriptions hold up to 5,000 characters, but only the first 150–200 appear above the "Show more" fold. Include target keywords and a compelling summary in those first two lines.
Common Mistakes
- Ignoring preview truncation: Most platforms show only a portion before requiring a tap to expand
- Cross-posting without adapting: A 280-character tweet wastes LinkedIn's 3,000-character potential
- Hashtag overload: 5–10 relevant hashtags typically outperform using all 30 on Instagram
Pro Techniques
- Platform-native content: Adapt your message length and style to each platform
- Front-load value: Put compelling information before the truncation point
- Use line breaks: White space improves readability on mobile
Staying Within Limits
Character limits evolve as platforms update. X expanded from 140 to 280, TikTok from 150 to 4,000. Use Character Counter to verify your content length in real time.