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SEOReviewed September 5, 2026

What is Technical SEO?

Technical SEO is the work of making a website easy for search engines to crawl, render, understand and index, covering things like site speed, structure, redirects and structured data.

What it covers

Crawlability and indexing, site speed and Core Web Vitals, mobile usability, site structure and internal links, redirects and broken links, canonical tags, XML sitemaps, robots.txt and structured data.

Why it comes first

Great content can't rank if search engines can't find, load or understand it. Technical problems quietly cap how well every page on the site can perform.

How to find problems

Google Search Console shows indexing issues, Core Web Vitals and crawl errors. A site crawler finds broken links, redirect chains, duplicate pages and missing tags. Fixing the issues that affect your most important pages comes first.

Why Technical SEO matters

Technical issues often affect many pages at once. Fixing one template or setting can lift a whole section of the site, which makes technical SEO some of the highest-leverage work in SEO.

The redirect that cost traffic

After a redesign, a site changed its URLs without redirecting the old ones. Search engines and visitors hit broken pages, and organic traffic dropped. Mapping old URLs to new ones and adding 301 redirects restored most of it over the following weeks.

Common mistakes

  • Blocking pages by accident

    A stray noindex tag or robots.txt rule can remove important pages from search results. Check them after every launch.

  • Slow, heavy pages

    Large images, unused scripts and slow servers hurt Core Web Vitals and the experience of every visitor.

  • Duplicate content without canonicals

    Multiple URLs showing the same content split signals. Canonical tags tell search engines which version to rank.

  • Auditing without fixing

    A long audit report changes nothing on its own. Prioritize fixes by impact and actually ship them.

Where we work on this

Related terms

Full glossary
Technical SEO

Core Web Vitals

Core Web Vitals are three field-measured metrics Google uses to assess page experience: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability).

Technical SEO

Crawl Budget

Crawl budget is the number of URLs a search engine will crawl on your site within a given period, determined by how fast your server responds and how much demand the engine has for your content.

Technical SEO

Canonical Tag

A canonical tag is an HTML link element that tells search engines which URL is the preferred version of a page when several URLs serve the same or very similar content.

SEO

Schema Markup

Schema markup is structured data added to a page, usually as JSON-LD, that describes what the content means in a vocabulary search engines understand.

SEO

On-Page SEO

On-page SEO is the work of improving the content and HTML of a page itself, like its title, headings, text, links and markup, so search engines understand it and rank it for the right searches.

SEO

SEO

SEO, or search engine optimization, is the work of improving a website so it shows up higher in unpaid search results for the searches its customers make.

SEO

Sitemap

A sitemap is a file, usually in XML format, that lists the pages on a website you want search engines to find and index.

SEO

Robots.txt

Robots.txt is a plain text file at the root of a website that tells search engine crawlers and other bots which pages or sections they shouldn't crawl.

Technical SEO

301 Redirect

A 301 redirect is a permanent redirect that automatically sends visitors and search engines from an old URL to a new one, telling search engines the move is permanent.

SEO

Alt Text

Alt text is a short written description of an image, added in the image's alt attribute, that screen readers read aloud and search engines use to understand what the image shows.

Applied, not theoretical

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