Social Media Character Limits & Post Specs (2026)
Every character limit, optimal post length, mobile truncation fold, and image dimension for X, LinkedIn, Instagram, Facebook, and Threads.
Platform Character Limit Meters
280 characters for standard accounts. Optimal length is 180-240 characters for retweets.
3,000 character hard limit. First 210 chars appear before the 'See more' cutoff fold.
2,200 character limit. Captions truncate in feed after 125 characters.
63,206 character limit. Posts under 80 characters receive up to 66% higher engagement.
500 characters per post limit.
What are the character limits for major social media platforms?
In 2026, standard post character limits are 280 characters for X (Twitter), 3,000 characters for LinkedIn, 2,200 characters for Instagram captions, 63,206 characters for Facebook, and 500 characters for Threads. Mobile feeds truncate posts much earlier - around 140 to 210 characters on LinkedIn and 125 characters on Instagram.
Want to see exactly where your hook cuts off? Test your draft in our LinkedIn Post Preview or Tweet Preview Simulator.
2026 Platform Character Limits & Truncation Folds
| Platform | Maximum Limit | Optimal Length | Feed Cutoff Fold | Key Details |
|---|---|---|---|---|
| X (Twitter) | 280 characters | 180 - 240 chars | 280 chars (X Premium 'Show more') | Every URL counts as 23 characters via t.co. X Premium supports up to 25,000 chars. |
| LinkedIn Posts | 3,000 characters | 800 - 1,400 chars | ~210 chars desktop / ~140 mobile | Headlines allow 220 chars; comments allow 1,250 chars. |
| Instagram Captions | 2,200 characters | 150 - 400 chars | 125 characters | Bio limit is 150 chars. Up to 30 hashtags allowed (3-5 focused tags recommended). |
| Facebook Posts | 63,206 characters | 40 - 120 chars | 400 - 480 characters | Concise discussion prompts earn higher organic comment velocity. |
| Threads | 500 characters | 180 - 320 chars | None on single post | Supports multi-post threads and up to 10 media items per post. |
2026 Social Media Image Dimensions & Aspect Ratios
| Format | Recommended Pixels | Aspect Ratio | Display Notes |
|---|---|---|---|
| X (Twitter) In-Stream Landscape | 1600 x 900 px (or 1200 x 675 px) | 16:9 | Cleanest link-card and single-image feed display without cropping. Max upload resolution up to 4096 x 4096 px. |
| X (Twitter) Square & Header | 1080 x 1080 px (post) · 1500 x 500 px (header) | 1:1 / 3:1 | Profile photo is 400 x 400 px (rendered circular). |
| LinkedIn Feed Image & Link Preview | 1200 x 1200 px (square) · 1200 x 627 px (link) | 1:1 / 1.91:1 | Square 1200 x 1200 px occupies more vertical screen space on mobile feeds. |
| Instagram Portrait & Square | 1080 x 1350 px (portrait) · 1080 x 1080 px (square) | 4:5 / 1:1 | Reels and Stories use 1080 x 1920 px (9:16). |
| Facebook Shared Image | 1200 x 630 px (landscape) · 1080 x 1080 px (square) | 1.91:1 / 1:1 | Cover photo displays at 851 x 315 px on desktop. |
Frequently asked questions
What is the Twitter (X) character limit in 2026?
Standard X accounts have a 280-character limit per post, and every URL counts as 23 characters via t.co shortening regardless of length. X Premium subscribers can publish up to 25,000 characters, with feed truncation around 280 characters.
What is the LinkedIn post character limit and cutoff?
LinkedIn allows up to 3,000 characters per standard post, 1,250 characters per comment, and 220 characters in your headline. Only the first ~210 characters on desktop (~140 on mobile) appear before '...more'.
What are the best X (Twitter) image dimensions?
Use 1600 x 900 px or 1200 x 675 px (16:9 aspect ratio) for landscape feed images and link cards, or 1080 x 1080 px (1:1) for square visuals. X accepts images up to 4096 x 4096 px (max 5 MB for photos on mobile, 15 MB on web).
Does supapost enforce these platform limits automatically?
Yes. Every post and smart reply generated through supapost's REST API or web tools is formatted for the target network's exact character limits and truncation fold.
Never worry about character limits again
supapost formats and validates social posts and smart replies per platform via REST API.