B2B founders should aim for 1,300 to 1,900 characters per LinkedIn post in 2026 — the range that consistently delivers +35% engagement and roughly 4x the reach of sub-400-character posts, based on Draper's analysis of AuthoredUp's 372,126-post dataset and Richard van der Blom's 2026 algorithm report covering 1.3M posts. Posts under 400 characters lose 30 to 60% of their reach.
What does the data show?
Engagement climbs steadily with length, and the gap between the shortest and longest posts is large. Across AuthoredUp's 372,126 personal-profile posts (Sep 2025–Feb 2026):
| Character range | Engagement vs <400 chars |
|---|---|
| Under 100 characters | −60% reach |
| Under 300 characters | −30% reach |
| 400–900 characters | Baseline |
| 900–1,000 characters | +17% engagement |
| 1,000+ characters | +35% engagement |
| 1,301–2,500 characters | +27% vs <400 chars |
Draper query: How long should LinkedIn posts be for B2B founders in 2026? Compare engagement, comments, and reach across different post lengths and identify the optimal range.
The "see more" truncation at roughly 210 characters acts as a hard fork. Readers either click through or scroll past — and posts that earn the click see a measurable step-up in completion and engagement. A strong hook in the first 200 characters is effectively a gating mechanism. Longer posts only pay off if the hook clears that bar.
What should marketers do with this?
Default to 1,300–1,900 characters per post. That range clears the algorithm's preference for depth, fits comfortably within mobile reading, and leaves room to include a question at the end — which generates +77% more comments according to Metricool's 2026 study of 673,658 posts. Above 2,500 characters, returns plateau; there is no meaningful advantage to pushing toward LinkedIn's 3,000-character cap.
Two structural moves amplify length. First, readability formatting — whitespace and line breaks every 1–2 sentences — adds up to +36% reach independent of character count. Second, founder personal profiles drive 238% more comments than company pages at equivalent length, and employee-shared content achieves 561% greater reach than company-page posts. The long-form playbook applies to founder accounts, not brand pages — and short posts under 400 characters underperform across both.
What's the emerging signal in this data?
50.1% of your LinkedIn reach is decided before you post. Van der Blom's 2026 algorithm report attributes more than half of post impressions to profile-baseline factors: follower history, topic consistency, and past engagement. Post-level content — including length — accounts for only 29.5%. The other 20.5% is external noise. Length optimisation operates within a ceiling set by profile authority. A founder posting consistently on a tight topic for 12 months will see stronger returns from length optimisation than one starting from scratch — and 50% of all post impressions land within 48 hours, so reach decisions made in the first two days are final.
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