Post Length Optimizer

Post length is one of the most overlooked factors in social media performance. Every platform has different character limits and different sweet spots for engagement. Posting the right length can mean the difference between going viral and being ignored.

Twitter/X (280 characters)

Twitter's famous 280-character limit forces brevity. Research shows tweets between 71-100 characters receive 17% more engagement than longer tweets. Short, punchy statements with a clear call-to-action outperform lengthy threads for single-tweet posts. If you need more space, use a thread format.

Instagram (2,200 characters)

Instagram captions can hold 2,200 characters, but the first 125 characters are what matters most — that is all users see before tapping "more." Micro-captions (under 150 characters) work well for visual-first content, while long-form captions (800-2,000 characters) drive saves and shares for educational or storytelling posts.

Facebook (63,206 characters)

Facebook has the most generous character limit at over 63,000 characters, but shorter posts dominate. Posts with 40-80 characters get 86% more engagement. Facebook truncates posts after about 477 characters on desktop and even fewer on mobile, so front-load your key message.

LinkedIn (3,000 characters)

LinkedIn rewards depth. Posts between 1,300-2,000 characters consistently outperform shorter updates for thought leadership content. The first 140 characters appear above the fold, so craft a compelling hook. Use line breaks every 1-2 sentences for mobile readability.

TikTok (2,200 characters)

TikTok expanded its caption limit to 2,200 characters, but brevity wins. Captions under 150 characters receive the highest view rates. Use your caption to add context the video does not provide, include 3-5 trending hashtags, and keep it scannable.

Reddit (300 characters for titles)

Reddit post titles have a 300-character limit. The best-performing titles are clear, specific, and under 120 characters. Avoid clickbait — Reddit communities penalize it. Use the post body for detailed content and save the title for a concise summary.

Pinterest (500 characters)

Pinterest descriptions max out at 500 characters. Optimal length is 100-200 characters with relevant keywords woven in naturally. Pinterest is a search engine — treat your description like a mini SEO snippet to maximize discovery.

YouTube (5,000 characters)

YouTube descriptions can hold 5,000 characters. The first 100-150 characters appear in search results, so front-load keywords. Descriptions over 200 words correlate with better search rankings. Include timestamps, links, and a clear call-to-action.

Threads (500 characters)

Threads has a 500-character limit per post. Short, conversational posts between 50-100 characters tend to get the most engagement. For longer ideas, use the threading feature to chain multiple posts together.