Lawrence Hitches Maintained by Lawrence Hitches | AI SEO Consultant | Updated June 19, 2026
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Every HTML head tag that matters for SEO, with syntax, in one reference. The load-bearing ones are the title tag (~60 chars, the biggest on-page lever), rel=canonical, and the robots meta. Meta description drives click-through, not ranking. Meta keywords are ignored by Google and Bing, so skip them.

The head tags that matter~60 chars, the click~155 chars, the pitchthe master versionthe social previewThe title and canonical are load-bearing. Get those right first.lawrencehitches.com
The title and canonical are load-bearing. Get those right first.

The HTML head tags that matter for SEO

What goes in your <head> tells search engines and AI how to title, describe and index the page. These are the ones worth getting right.

TagPurposeSyntaxNotes
titlePage title in SERP and tab<title>Page Title</title>~60 chars; the biggest on-page lever
meta descriptionSnippet under the title<meta name="description">~155 chars; drives CTR, not ranking
rel=canonicalConsolidate duplicates<link rel="canonical" href>Self-reference or point to the preferred URL
meta robotsIndex/follow control<meta name="robots" content="noindex,nofollow">Controls this page only
hreflangLanguage and region<link rel="alternate" hreflang="en-au">Needs matching return tags both ways
viewportMobile rendering<meta name="viewport" content="width=device-width">Required for mobile-first indexing
charsetCharacter encoding<meta charset="utf-8">Put it first in the head
Open GraphSocial and AI previews<meta property="og:title">, og:image, og:descriptionUsed by social platforms and some AI previews
Twitter CardX share cards<meta name="twitter:card">Falls back to Open Graph
meta keywordsLegacy<meta name="keywords">Ignored by Google and Bing; skip it

The load-bearing tags are title, canonical and meta robots. Open Graph matters for shares and increasingly for AI previews. More in header tags and on-page SEO.

Watch: how this works in practice

On-page signals beyond the obvious title tag.

Bookmark this meta tags quick-reference card: keep it handy for your next audit.

For question-and-answer markup, see the FAQ schema guide.

Looking for more? Browse the SEO cheatsheet hub in one place.

Part of the Technical SEO cheatsheet.

Frequently asked questions

Do meta keywords still matter for SEO?

No. Google and Bing have ignored the meta keywords tag for years. Spending time on it does nothing; focus on the title, description and content.

What is the ideal meta description length?

Around 155 characters before truncation. Write it for click-through with the query and a reason to click; it influences CTR but is not a direct ranking factor.

Does the meta description affect ranking?

No, not directly. Google often rewrites it anyway. Its job is to win the click once you already rank, so treat it as ad copy for the result.

What does a canonical tag do?

rel=canonical tells search engines which URL is the preferred version when several URLs show similar content, consolidating ranking signals onto one page and preventing duplicate-content dilution.

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Lawrence Hitches
Lawrence Hitches AI SEO Consultant, Melbourne

Chief of Staff at StudioHawk, Australia's largest dedicated SEO agency. Specialising in AI search visibility, technical SEO, and organic growth strategy. Leading a team of 120+ across Melbourne, Sydney, London, and the US. Book a free consultation →