Which meta tags Google actually reads in 2026
Google's crawler ignores most meta tags. The ones it uses: description (as a snippet candidate — not guaranteed to appear), and robots (to control indexing and link following). The keywords meta tag has been ignored by Google since 2009 — it still gets included in generators but provides no SEO value. The author and viewport tags are used for other purposes (E-E-A-T signals and mobile rendering respectively) but do not directly affect rankings.
Complete tag reference and character limits
| Tag | Limit | Used by | Notes |
|---|---|---|---|
| <title> | 50–60 chars | Google, browsers, social | Shown in SERP; longer titles get rewritten by Google |
| meta description | 155–160 chars | Google (snippet candidate) | Google rewrites ~60% of descriptions anyway |
| og:title | 40–60 chars | Facebook, LinkedIn, Slack | Different from <title> — optimize for social separately |
| og:description | 100–150 chars | Facebook, LinkedIn | Twitter/X ignores this; uses twitter:description |
| og:image | 1200×630px min | All social platforms | Missing = ugly auto-generated preview; use absolute URL |
| twitter:card | summary_large_image | Twitter/X | Required for card display; without it, no image preview |
| robots | noindex, nofollow | All crawlers | noindex alone is sufficient to block ranking |
| canonical | Full URL | Google, Bing | Must match the page exactly; include or exclude www consistently |
The three meta tag mistakes that cost traffic
- Missing og:imageWhen your page is shared on LinkedIn or Slack without an og:image, the platform generates a preview with no image or a random on-page image. Click-through rates on link previews with images are 3–5× higher than those without. This is the single highest-ROI meta tag to add to content pages.
- Duplicate title tagsMultiple pages with identical
<title>values send a consolidation signal to Google — it will pick one page to show and demote the others. Every page needs a unique title that describes what's actually on that specific page. - Canonical pointing to wrong URLA canonical tag pointing to a different domain, a 404, or a redirect target tells Google to index a different page than the one it's on. This is one of the most common technical SEO errors and causes ranking loss that looks like a penalty. Always verify canonical URLs resolve correctly after any domain or URL structure changes.
Required Open Graph and Twitter Card tags — what each platform needs
When someone shares your URL, Facebook, X/Twitter, LinkedIn, Slack, and WhatsApp all read different meta tags to generate the link preview card. Missing tags cause broken or empty previews:
| Tag | Platform that reads it | Required? | Recommended value |
|---|---|---|---|
| og:title | Facebook, LinkedIn, Slack, WhatsApp, Discord | Yes | Page title — up to 60 characters for best display |
| og:description | Facebook, LinkedIn, Slack, Discord | Recommended | 2–3 sentence description; 200 characters max |
| og:image | All platforms | Yes — or preview is blank | 1200×630px minimum; JPEG or PNG; under 8MB |
| og:url | Facebook, LinkedIn | Recommended | Canonical URL of the page (no query strings) |
| og:type | Recommended | "website" for most pages; "article" for blog posts | |
| twitter:card | X/Twitter | Yes for Twitter | "summary_large_image" for full-width image cards |
| twitter:title | X/Twitter | Yes if og:title absent | Same as og:title or a shorter version |
| twitter:description | X/Twitter | Recommended | Up to 200 characters |
| twitter:image | X/Twitter | Yes for image card | Minimum 300×157px; max 5MB; JPEG or PNG |
| <title> tag | All (fallback) | Yes | Used as fallback when og:title is missing |
| <meta name="description"> | Google, Bing (search preview) | Yes for SEO | Up to 160 characters for search result snippet |