What Is Technical SEO?
Technical SEO is the plumbing of a website. This guide explains what it covers, how to spot a technical problem and who should fix it.
Short answer
Technical SEO is the work that lets search engines do 4 jobs with your site: find it, read it, understand it and load it quickly. It covers crawl access, indexing, redirects, mobile display, speed and structured data, and matters most when pages are missing from Google or after a redesign.
Four jobs a search engine does with your site
Think of a search engine as a visitor with four jobs: find your pages, read them, understand them and serve them quickly. Technical SEO removes whatever gets in the way of each job.
| Job | In plain words | What breaks it | What you would notice |
|---|---|---|---|
| Find | Reach every page that matters | robots.txt blocks, pages no other page links to, navigation that depends on scripts | Pages never appear in Google |
| Read | Load the page and see its content | A leftover noindex tag, content that appears only after a click, links that are not real links |
A page is found but not shown in results |
| Understand | Work out what the page is about and which version is main | Duplicate pages with no canonical tag, missing or repeated titles, confusing redirects | The wrong page ranks, or none does |
| Serve | Deliver it quickly and safely to a phone | Slow images, layout that jumps, no HTTPS, a broken mobile layout | Visitors leave, and Core Web Vitals reports show poor scores |
Notice that none of the jobs involve writing. A beautifully written page that fails the first two jobs earns nothing.
What counts as technical and what does not
| Task | Technical, content or local? |
|---|---|
| Letting Google crawl a section of the site | Technical |
| Setting a redirect from an old page | Technical |
| Making the site pass Core Web Vitals | Technical |
| Adding structured data to a page | Technical, with content input |
| Writing a page title that matches what people search | Content (on-page) |
| Writing a service page with specific detail | Content |
| Completing a Google Business Profile | Local |
| Getting reviews | Local |
Many owners pay for technical work when the real gap is content, and the reverse also happens. The test below tells you which one you have.
Is your problem technical?
It is probably technical when:
- Pages you expect in Google do not appear with a
site:search - Traffic fell sharply after a redesign, a move or a new platform
- The page that appears for your service is the wrong one
- The site is slow or broken on a phone
- A Search Console report lists errors you cannot explain
It is probably not technical when your pages are indexed and fast, but they get no clicks (look at titles and relevance), or they get clicks and no enquiries (look at the page and the offer). If your pages are indexed and your business is local, the Business Profile is a better place to start.
Who handles it
Who does the technical work depends on how the site was built.
| Your site | What you control | Who fixes technical issues |
|---|---|---|
| Hosted builder such as Wix or Squarespace | Titles, descriptions, page URLs and redirects, within limits | You, using the builder's settings. Google notes that some systems do not let you edit robots.txt directly |
| WordPress or Shopify | Most settings, plus plugins and themes | You or a freelancer, with a developer for speed |
| Custom-built site | Whatever the developer built | Your developer, working from a written specification |
A technical SEO specialist or agency does four things: audits the site, writes the specification, checks the developer's work and monitors after changes. Ask for evidence at each step. Our guide on what a real SEO audit includes shows what that evidence looks like.
What a technical specification contains
A specification is a short document that tells developers what the site must do for search. Use it when you commission a new build or major change. A useful one covers:
- Address rules. Readable URLs, one version of each page, and a redirect from every retired address
- Status codes. A real 404 or 410 for missing pages, never a normal page with an error message
- Index controls. Which sections may be indexed, how canonical tags are set and that test sites use
noindex - Crawl files. How the sitemap is generated and what robots.txt allows
- Rendering. What content is present in the delivered HTML, and that links are standard
<a href>links - Performance targets. Core Web Vitals thresholds measured on real devices
- Structured data. Templates for the types you need, kept in line with visible text
- Multilingual setup. URL pattern for each language and hreflang annotations
- Analytics. Events for calls, forms and purchases, carried over from the old site
Ask the developer to confirm each item in writing before launch and to show the evidence afterwards.
How to improve technical SEO
Work in the order of the four jobs. Check that important pages can be found, then that they can be read, then that the right version is chosen, then that they load well. Our technical SEO checklist puts those steps in a sequence with free tools, and the guides on Core Web Vitals and schema markup cover the two topics most owners find confusing.
When it is not worth paying for
A small brochure site on a mainstream platform, with indexed pages and a passing speed report, rarely needs a paid technical programme. Run the free checks, fix what they show, and spend the saved money on content or reviews. Pay for specialist help when you are about to redesign, move or rebuild, or when an unexplained drop in indexed pages follows a change. To talk it through, see our SEO service or our web design work.
Sources
Frequently asked questions
Why is technical SEO important?
If search engines cannot reach, read or load a page, good content on it earns nothing. Technical faults can also make pages vanish from results after a redesign. Technical SEO protects the work you put into everything else.
What is included in technical SEO?
Crawl access (robots.txt, links, sitemaps), indexing controls (noindex and canonical tags), redirects and status codes, mobile display, page speed and Core Web Vitals, HTTPS, structured data and, for multilingual sites, hreflang. Writing titles and copy is on-page work.
What is a technical SEO specification?
It is a written list of requirements for developers building or changing a site: URL rules, redirects, canonical tags, sitemap and robots.txt behaviour, rendering, performance targets and structured data. It lets you check delivery against a standard instead of an opinion.
How do I fix technical SEO issues?
Find the cause with Search Console's URL Inspection and indexing reports, fix the cause rather than the symptom, test one sample page, then roll the change out. Change one thing at a time so you can tell what worked.
What is technical SEO in simple words?
It is making your website easy for Google to find, read and load. You are not writing for readers here. You are removing obstacles such as blocked pages, broken links, slow loading and pages that show different content on a phone.
Keep reading
Technical SEO Checklist
A technical SEO checklist in five ordered stages, with a free way to test each check, what a pass looks like and which popular tasks you can safely skip.
5 min read
Core Web Vitals Explained
What the three Core Web Vitals measure, the pass marks, how to read your report, which problems to fix first and how much speed really affects rankings.
5 min read
What a Real SEO Audit Includes
What to expect from an SEO audit service: seven sections, the evidence to ask for, how to spot an automated report and what a useful audit leaves you with.
5 min read
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