Exact word count and character limits for Google SEO, X (Twitter), LinkedIn, Instagram, YouTube, email newsletters, Google Ads, and academic writing — all in one place. The complete data-backed reference for writers and content creators in 2026.
Every platform you publish on has its own rules — some hard technical limits, some soft algorithmic preferences. Writing too short means missing ranking signals. Writing too long means truncated previews, ignored posts, or rejected ads. Knowing the exact numbers for each platform is one of the simplest ways to improve content performance without changing a word of your actual writing.
Hard limit vs optimal range: A hard limit is the technical maximum — exceeding it gets your content cut off or rejected. An optimal range is what research shows performs best for engagement or ranking. Both matter — but optimising for the sweet spot within the hard limit is what separates good content from great content.
Google does not have an official minimum word count for ranking. However, extensive SEO research consistently shows that longer, more comprehensive content outranks thin content for competitive keywords — because length correlates with depth, authority, and the ability to match more search intent variations.
AI search (SGE) is changing SEO word count rules. Google's AI Overviews pull answers directly from long-form, structured content. In 2026, targeting 2,500–4,000 words with clear headings, FAQ sections, and structured data gives you the best chance of appearing in AI-generated summaries — which now appear above traditional blue links for many queries.
Based on an average adult reading speed of 238 words per minute (scientific consensus figure). Use ToolLoom's Word Counter to see real-time reading time for your content.
YouTube SEO tip: The first 157 characters of your video description appear in search results — treat this exactly like a meta description. Include your primary keyword naturally within the first 2 sentences, and always add timestamps, links, and chapters further down in the full description.
Mobile-first subject lines: Over 60% of email is opened on mobile in 2026. A subject line that looks fine at 55 characters on desktop gets cut to "Your complete guide to sav..." on a phone screen. Always preview your subject line on a mobile screen before sending.
| Platform / Ad Type | Field | Character Limit |
|---|---|---|
| Google Search Ads | Headline (per headline, up to 15) | 30 characters |
| Google Search Ads | Description (up to 4) | 90 characters |
| Google Display Ads | Short headline | 30 characters |
| Google Display Ads | Long headline | 90 characters |
| Meta / Facebook Ads | Primary text (recommended) | 125 characters |
| Meta / Facebook Ads | Headline | 40 characters |
| Meta / Facebook Ads | Description | 30 characters |
| Instagram Ads | Caption | 2,200 characters |
| LinkedIn Ads | Introductory text | 150 characters |
| LinkedIn Ads | Headline | 70 characters |
| LinkedIn Ads | Description | 100 characters |
| YouTube Ads | Headline | 15 characters |
| YouTube Ads | Long headline | 90 characters |
| SMS Marketing | Per message (standard GSM) | 160 characters |
| SMS Marketing | Unicode (Emoji / special chars) | 70 characters per segment |
Google Ads headlines: With up to 15 headlines and 4 descriptions in a Responsive Search Ad, Google's algorithm tests combinations automatically. Write all 15 headlines as if each could appear alone — don't write them to "flow" together, as they'll be mixed and matched unpredictably.
| Document Type | Typical Word Count | Notes |
|---|---|---|
| Abstract | 150 – 250 words | Most journals specify their own limit |
| Short essay | 500 – 1,000 words | Common for school and college assignments |
| Standard essay | 1,500 – 2,500 words | Most common academic essay format |
| Research paper (journal) | 3,000 – 8,000 words | Varies widely by journal and discipline |
| Undergraduate dissertation | 10,000 – 15,000 words | Typical UK/India undergraduate range |
| Master's thesis | 15,000 – 50,000 words | Varies significantly by programme |
| PhD thesis | 60,000 – 80,000 words | Social sciences often higher; sciences often lower |
| Cover letter | 250 – 400 words | One page maximum — never exceed 500 words |
| Resume / CV (one page) | 400 – 600 words | Senior professionals: up to 800 words for 2 pages |
| LinkedIn profile summary | Under 220 characters | This is the character limit for the headline field |
Academic word count tip: Most institutions count words excluding bibliography, footnotes, and appendices — but rules vary. Always check your institution's specific guidelines before submitting. When in doubt, ask your supervisor or check the assignment brief.
Every platform limit in one place — bookmark this for your content workflow.
| Platform / Type | Limit / Target | Unit | Status |
|---|---|---|---|
| SEO blog post | 1,500 – 2,500 | words | Optimal |
| AI search optimised post | 2,500 – 4,000 | words | Optimal |
| Meta title | Under 60 | characters | Hard limit |
| Meta description | Under 155 | characters | Hard limit |
| X / Twitter (free) | 280 max / 71–100 ideal | characters | Hard limit |
| X Premium | 25,000 max | characters | Hard limit |
| LinkedIn post | 3,000 max / 1,800–2,100 ideal | characters | Optimal |
| Instagram caption | 2,200 max / under 125 for feed | characters | Optimal |
| Facebook post | 63,206 max / under 80 ideal | characters | Optimal |
| TikTok caption | 4,000 max / 150–300 ideal | characters | Optimal |
| YouTube title | 100 max / under 70 visible | characters | Hard limit |
| YouTube description | 5,000 max / first 157 in search | characters | Hard limit |
| Email subject line | 41–50 ideal / under 60 safe | characters | Optimal |
| Email preview text | 85 – 100 | characters | Optimal |
| Google Ads headline | 30 max | characters | Max |
| Google Ads description | 90 max | characters | Max |
| SMS (standard) | 160 per message | characters | Hard limit |
| Cover letter | 250 – 400 | words | Optimal |
| Standard essay | 1,500 – 2,500 | words | Optimal |
| PhD thesis | 60,000 – 80,000 | words | Optimal |
Social Media Character Limits
The "see more" truncation problem: Most social platforms truncate long captions with a "see more" or "read more" link. Your first 125–210 characters (depending on platform) must hook the reader strongly enough to make them tap to expand. Write your most compelling line first — not a preamble.