Every platform has a cap, and the cap matters. Under it, you're writing concisely. Over it, you're rewriting. Here's the cheat sheet — current as of early 2026 — for the limits you're actually likely to hit.
Social platforms
- X (Twitter) — 280 chars (free), 25,000 chars (X Premium). URLs count as 23 chars flat.
- Bluesky — 300 chars per post.
- LinkedIn post — 3,000 chars; truncates around 210 with a "see more" fold.
- Threads — 500 chars per post.
- Mastodon — 500 chars default; some servers extend to 10,000.
- Instagram caption — 2,200 chars; truncates around 125 chars on mobile.
- Reddit title — 300 chars; body up to 40,000.
- YouTube title — 100 chars; description 5,000.
Email + messaging
- Email subject — aim for 40–50 chars. Mobile clients truncate around 30.
- Email preheader — 40–100 chars visible in inbox preview.
- SMS — 160 chars per segment. Longer messages split into multiple.
- iMessage / WhatsApp — no practical limit; formatting breaks around 40k.
- Push notification — title 50 chars, body 100 chars before truncation.
SEO + meta fields
- Meta title — 60 chars recommended; Google shows up to ~70.
- Meta description — 150–160 chars recommended.
- Open Graph title — 60 chars.
- Open Graph description — 150–200 chars.
- Alt text — 125 chars is the practical ceiling; screen readers read it all.
- URL slug — under 60 chars. Short slugs rank better.
// TRY THE TOOL
CHECK YOUR LENGTH.
Paste your draft, see character and word counts live. Aim at the right platform.
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