SEO Tags
HTML elements and on-page labels that help search engines understand a page’s topic, structure, and crawl rules, while influencing how the page appears in search results.
If you have ever treated every tag as a ranking factor or confused CMS post tags with HTML tags, you already know the gap between what tags do and what people expect them to do.
Key points
- Use a unique, specific title tag on every page — duplicate titles weaken relevance signals.
- Write meta descriptions for users, not search engines; they improve click-through rate but do not directly rank pages.
- Heading tags structure content for both users and crawlers — use them logically, not for keyword stuffing.
- Canonical tags prevent duplicate content issues by signalling the preferred URL version.
- Alt text on images improves accessibility and gives search engines context — describe the image, do not stuff keywords.
- Meta keywords are obsolete for modern SEO and should be ignored.
A title tag rewrite changes your snippet
You write a title tag: 'Best Running Shoes 2024 | Shop Now'. Google rewrites it in search results to 'Running Shoes – Free Delivery' because it decides the original is too promotional. Your click-through rate drops by 15%. The meta description you carefully wrote is also ignored, replaced with a snippet from the page body. This happens because Google's algorithms evaluate titles and descriptions independently of what you set, especially when they detect keyword stuffing or low relevance.
Four ways it goes wrong
- Duplicate title tags Using the same title tag across many pages confuses search engines about which page is relevant for a query. Each page needs a unique, descriptive title.
- Keyword stuffing in alt text Filling alt text with keywords instead of describing the image harms accessibility and can trigger spam penalties. Keep it natural and descriptive.
- Ignoring canonical tags Without a canonical tag, search engines may index multiple versions of the same page, diluting ranking signals. Set it on every page with duplicate content.
- Treating meta keywords as useful Meta keywords are ignored by Google and other major search engines. Spending time on them wastes effort that could go into title tags or structured data.
Three checks before you act
- Check your title tag length Title tags over 60 characters may be truncated in search results. Use a title test tool to preview how your title appears before publishing.
- Verify your meta description length Meta descriptions longer than 155 characters are often cut off. Use a meta description checker to ensure your snippet stays intact.
- Test your canonical URL A misconfigured canonical tag can cause the wrong page to be indexed. Verify the canonical URL points to the preferred version, especially after CMS migrations.
Common questions
What are the best SEO meta tags?
The most important are title tags, meta descriptions, canonical tags, and heading tags. Focus on these before others.
What is a meta tag in HTML with example?
A meta tag is an HTML element in the <head> section. Example: <meta name="description" content="A short page summary">.
Are meta keywords still used for SEO?
No. Google and most search engines ignore meta keywords. They are obsolete and should not be part of your strategy.
Sources
- Google Search Central Official documentation on how Google handles HTML tags and indexing.
- Ahrefs Practical guide to meta tags with examples and common mistakes.
- Semrush Overview of meta tags, their purposes, and best practices.