Meta tags are small pieces of HTML code in the <head> of your web pages. They're invisible to visitors but communicate vital information to search engines and social media platforms. Getting them right is one of the highest-return SEO tasks you can do.

What are meta tags?

Meta tags are HTML attributes that provide metadata about a web page. They sit inside the <head> section of your HTML and are not visible to the user on the page itself — but they're read and used by search engines, social networks, and browsers.

The most important meta tags for SEO are the title tag, meta description, canonical tag, and robots meta tag. For social sharing, Open Graph and Twitter Card tags are essential.

The title tag — the most important meta tag

Technically, the <title> tag isn't a "meta" tag — it's its own element — but it's typically included in meta tag discussions because it's so critical to SEO.

The title tag appears as the clickable blue headline in Google search results and in browser tabs. It's the single most important on-page SEO element.

Title tag best practices

Length: Keep it between 50–60 characters. Google truncates anything longer (approximately 580px pixel width).
Primary keyword: Include your target keyword, ideally near the beginning.
Brand name: Add your brand at the end, separated by a pipe (|) or dash.
Uniqueness: Every page on your site must have a unique title tag.
No keyword stuffing: Write for humans, not algorithms. "SEO Checker | Free SEO Tool | SEO Audit | Website SEO" looks spammy.

Good example: "What is SEO? A Beginner's Guide to Search Engine Optimisation | CheckSEO"

Bad example: "SEO SEO What is SEO SEO Guide SEO"

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The meta description

The meta description is the short paragraph that appears below your title tag in search results. Google does not use it as a ranking factor, but it heavily influences click-through rates — which indirectly affects your rankings.

When Google's algorithm doesn't like your meta description, it will rewrite it using content from your page. This is increasingly common, but it's still important to write a good one because Google sometimes uses yours verbatim.

Meta description best practices

Length: 150–160 characters. Google shows approximately 155–160 characters on desktop.
Include your keyword: Google bolds the matching terms, making your result stand out.
Summarise the page accurately: Don't write clickbait that doesn't match the content.
Include a call to action: "Learn more", "Find out how", "Get your free report" — action words work.
Make it unique: Duplicate meta descriptions across pages hurt user experience and look lazy.

Open Graph meta tags

Open Graph (OG) tags were created by Facebook and are now used by most social platforms (Facebook, LinkedIn, WhatsApp, Slack, etc.) to control how your pages appear when shared.

Essential Open Graph tags:

og:title — the title shown in the social share card (can differ from your title tag)
og:description — the description shown in the card
og:image — the image shown when the link is shared. Use 1200×630px for best results.
og:url — the canonical URL for the page
og:type — usually "website" or "article"

Twitter Card meta tags

Twitter (now X) uses its own set of meta tags for controlling link previews. If you've set Open Graph tags, you can often reuse that data:

twitter:card — "summary_large_image" for a big image preview or "summary" for a smaller one
twitter:title — the title for the card
twitter:description — the description
twitter:image — the image (can be same as og:image)

The canonical tag

Canonical tags tell search engines which version of a page is the "original" when the same or similar content exists at multiple URLs. This prevents duplicate content issues that can dilute your rankings.

For example, if your blog post is accessible at both:

https://example.com/blog/what-is-seo
https://example.com/blog/what-is-seo?ref=newsletter

You'd add a canonical tag pointing to the first URL on both pages.

The robots meta tag

The robots meta tag controls whether search engines index a page and follow its links. The most common values are:

index, follow — default. Index this page and follow its links.
noindex, nofollow — don't index this page and don't follow its links. Use for thank-you pages, login pages, and internal search results.
noindex, follow — don't index but do follow links. Useful for paginated content.

The viewport meta tag

This tag controls how your page displays on mobile devices. It's essential for mobile-friendliness:

<meta name="viewport" content="width=device-width, initial-scale=1">

Without this tag, mobile browsers will render your page as a desktop site and scale it down — creating a terrible user experience and hurting your mobile rankings.

Common meta tag mistakes

Duplicate title tags — one of the most common issues. Every page needs its own unique title.
Missing meta descriptions — if you don't provide one, Google will pick its own text from your page, often poorly.
Title tags over 60 characters — Google truncates them, cutting off important words.
No OG image — pages shared on social media without an OG image look unprofessional and get fewer clicks.
Wrong canonical tag — pointing canonical tags to the wrong URL is surprisingly common and can cause indexing problems.
Using noindex in the wrong places — accidentally adding noindex to important pages keeps them out of search results entirely.

Use our free SEO checker to instantly identify all meta tag issues on any page. Also check out our guide on how to check your website's SEO.

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