Technical SEO Guide: How to Make Your Website Search-Friendly

A website can hold excellent content and still stay invisible, because something behind the scenes stops search engines reaching or reading it. A single forgotten setting from a website launch can hide an entire business from Google.

Technical SEO doesn’t always mean advanced development work. Many important checks are simple settings you can review yourself, while others do need a developer. This guide tells you which is which, in the order our technical SEO service works through them.

Quick answer: Technical SEO makes sure search engines can access, crawl, understand and index your website. It covers indexing settings, sitemaps, status codes, redirects, canonicals, mobile usability and page speed.

What Is Technical SEO?

Technical SEO has six main objectives:

• Make important pages accessible.
• Support crawling and indexing.
• Provide clear URL and canonical signals.
• Ensure pages work correctly.
• Improve the page experience.
• Help search engines interpret structured information.

Fact: Google’s technical requirements are short. Googlebot must not be blocked, the page must return a working HTTP 200 response and it must have indexable content.

How Crawling, Indexing and Ranking Relate to Technical SEO

Search works in three stages:

1. Crawling: the search engine fetches your page.
2. Indexing: it analyses the page and may store it.
3. Serving and ranking: it selects results for each search.

Example: a service page may exist in WordPress yet stay out of search because of an accidental noindex tag. The page looks fine to you, but Google has been told to leave it out.

Two points catch people out. A sitemap doesn’t guarantee indexing, and being indexed doesn’t guarantee rankings. Our guide to how search engines work explains each stage in detail.

Technical SEO Audit: Step by Step

Work through these 12 checks in order, because the first few can block everything else.

1. Check indexability

Look at:

• HTTP response codes
• Meta robots directives
• X-Robots-Tag HTTP headers
• Accidental noindex tags
• Robots.txt restrictions
• Password-protected or inaccessible pages
• Important pages excluded from indexing

Crawling and indexing are controlled separately. Robots.txt manages crawling, while noindex manages whether a page can appear in results.

Pro tip: Use the URL Inspection tool in Search Console on your five most important pages. It takes about five minutes and shows you what Google actually sees.

2. Review robots.txt

• It lives at the root of your site, such as example.com/robots.txt.
• Disallow rules ask crawlers not to visit certain paths.
• Overly broad rules can block useful CSS, scripts and pages.
• It isn’t a reliable way to remove a URL from search results.

Here is an illustrative example, which you must adapt to your own site:

User-agent: *
Disallow: /private-area/
Sitemap: https://example.com/sitemap.xml

Fact: A blocked page can still be indexed if other sites link to it, as Google’s robots.txt introduction explains. Use noindex to keep a page out of results, and make sure it isn’t also blocked.

3. Review the XML sitemap

• Does a sitemap exist?
• Does it return a successful response?
• Does it contain only canonical, indexable URLs?
• Have you removed redirected and broken URLs?
• Have you submitted it in Search Console?
• Do larger sites split it sensibly?

Fact: A single sitemap can hold up to 50,000 URLs or 50MB uncompressed, according to Google’s sitemap documentation. Sitemaps help discovery but don’t force indexing.

4. Audit HTTP status codes

Status code	Meaning	SEO action
200	Request succeeded	Confirm the page has the intended content
301	Permanent redirect	Ensure it points to the right destination
302	Temporary redirect	Confirm the temporary behaviour is intended
404	Page not found	Restore, redirect or leave it, depending on the case
410	Resource is gone	Confirm the removal is intended
500	Server error	Investigate the server problem

Redirects should preserve a useful journey for the visitor, so don’t send every removed URL to the homepage. MDN’s status code reference lists every code in plain terms.

5. Check canonical tags

• What they do: tell search engines which URL you prefer.
• Why duplicates happen: the same page can load through several URLs.
• How they differ from redirects: a redirect moves the visitor, while a canonical is only a hint for search engines.
• How strong they are: Google treats them as signals, not absolute commands.
• What should align: internal links and sitemaps should use the preferred URL.

Example: these four addresses might all show one page, so one needs to be the clear preferred version:

• http://example.com/plumbing
• https://example.com/plumbing
• https://example.com/plumbing/
• https://example.com/plumbing/?ref=email

Google’s guide to consolidating duplicate URLs covers the options.

6. Find broken links and orphan pages

• Broken internal and external links
• Pages with no internal links pointing to them
• Important pages buried deep in the navigation
• Incorrect links after a redesign
• Pages reachable only through site search or forms

Compare your crawl results against your sitemap, since a crawler can only find orphan pages through the sources you give it.

7. Review redirects

• Redirect chains
• Redirect loops
• Redirects to irrelevant pages
• Temporary redirects left in place by mistake
• Old URLs after a migration
• HTTP-to-HTTPS handling
• Consistency across your domain and hostname

8. Improve the mobile experience

• Responsive layouts
• The same main content on mobile and desktop
• Working mobile navigation
• Readable text
• Buttons that are easy to tap
• Images that fit the screen
• No rendering or interaction problems

Fact: Google mainly uses the mobile version of a site for indexing and ranking. If content is missing on mobile, Google may not see it.

9. Measure Core Web Vitals

Metric	Measures	Good target
LCP	Loading performance	2.5 seconds or less
INP	Responsiveness	200 milliseconds or less
CLS	Visual stability	0.1 or less

These thresholds apply at the 75th percentile of page visits, assessed separately for mobile and desktop. Google’s Core Web Vitals page explains how they fit into search.

Practical improvements:

• Compress and resize images.
• Reduce unnecessary JavaScript.
• Improve server response times.
• Reserve space to avoid layout shifts.
• Load your main content efficiently.
• Review third-party scripts.

10. Check structured data

• Valid JSON-LD
• Appropriate schema types
• Markup that matches visible content
• Required properties for eligible rich results
• No validation errors
• No misleading markup
• No breakage after CMS or theme updates

Valid structured data isn’t the same as eligibility for an enhanced result. Test yours with Google’s Rich Results Test.

11. Review JavaScript and rendering

Client-side rendering can delay or complicate content discovery.

• Are important text and links available to crawlers?
• Does the rendered HTML contain your main content?
• Does navigation use crawlable links?
• Does any content appear only after a click?

12. Manage duplicate and low-value URLs

• Duplicate pages
• URL parameters
• Pagination, where it applies
• Search-result pages
• Faceted navigation on e-commerce sites
• Thin or redundant pages

Duplicate content doesn’t automatically earn a penalty. The real job is helping search engines see which URLs are useful and preferred.

How to read the Page indexing report

Search Console’s Page indexing report gives a reason for each page that isn’t indexed. Not all of them are problems.

Status	What it means	Usually a problem?
Crawled, currently not indexed	Google fetched the page but didn’t add it	Check if the page matters
Discovered, currently not indexed	Google knows the URL but hasn’t fetched it	Often normal on new sites
Excluded by noindex tag	The page asks not to be indexed	Only if it’s an important page
Blocked by robots.txt	Crawling isn’t allowed	Only if you want it crawled
Alternate page with proper canonical tag	Google is using the preferred version	No, this is expected
Duplicate without user-selected canonical	Google chose another URL itself	Review your canonicals
Page with redirect	The URL redirects elsewhere	No, if it’s intended
Not found (404)	The page doesn’t exist	Only if it should exist
Soft 404	It looks like an error but returns 200	Yes, investigate
Server error (5xx)	The server failed to respond	Yes, fix it quickly

Pro tip: Focus on the pages that matter. A long list of excluded URLs is normal, and it’s only worth worrying about if your service pages or main guides appear there.

Technical SEO Tools

Tool	Main use
Google Search Console	Indexing reports, sitemaps and search performance
Screaming Frog SEO Spider	Crawling, status codes, links, titles and canonicals
PageSpeed Insights	Lab diagnostics and available field data
Rich Results Test	Testing eligible structured data
Browser developer tools	Inspecting requests, rendering and front-end behaviour
Server logs	Investigating crawler activity and responses

Start with the free ones: Search Console and PageSpeed Insights. They cover most small business needs.

Site Structure and HTTPS

Technical health isn’t only about errors. A clear structure helps people and crawlers find what matters.

• Keep important pages within a few clicks of the homepage.
• Group related pages logically, such as all services under /seo-services/.
• Add breadcrumbs so visitors can see where they are.
• Link related pages to each other.
• Serve every page over HTTPS with a valid certificate.
• Redirect HTTP addresses to their HTTPS versions.
• Fix mixed content, where a secure page loads insecure files.

Technical SEO for WordPress Websites

WordPress runs a large share of small business websites, and it has a few well-known traps:

• "Discourage search engines" setting: check under Settings, then Reading. It’s often left on after a launch.
• Plugin overlap: two SEO plugins can output conflicting tags, so use only one.
• Thin archive pages: tag and author archives can create many low-value URLs.
• Attachment pages: make sure image attachments don’t create their own thin pages.
• Heavy plugins and themes: every extra script can slow your pages.
• Updates: back up first, then test your forms and key pages afterwards.

How to Protect Rankings During a Redesign or Migration

Redesigns cause more serious SEO damage than almost anything else, usually because old addresses vanish without redirects. Before you go live:

1. List every current URL, including those that receive links.
2. Save your baseline figures from Search Console.
3. Map each old URL to its closest new page.
4. Test the new site on a private staging address.
5. Keep staging blocked from search, then remove the block at launch.
6. Add the 301 redirects and test a sample.
7. Check titles, canonicals, structured data and internal links.
8. Submit the new sitemap.
9. Watch indexing and errors closely for several weeks.

Google’s site move guidance covers this in more detail. Some ranking movement can be normal after a large change, so don’t panic in the first few days.

A Simple Monthly Technical Routine

• Review the Page indexing report for new issues.
• Check the Core Web Vitals report.
• Run a crawl and fix new broken links.
• Test your contact form and key pages on a phone.
• Confirm that your sitemap still loads.
• Review any manual action or security notices.

This takes about an hour on a small website, and it catches most problems before they cost you enquiries. If you need this built properly from the start, see our website development service.

How to Prioritise Technical SEO Problems

Rank each issue by:

• The number and importance of affected pages
• Whether it blocks crawling or indexing
• The business value of those URLs
• Its severity and frequency
• The effort and risk of fixing it

Priority	Example	Recommended response
Critical	Main service pages marked noindex by accident	Investigate and correct promptly
High	Important URLs return server errors	Resolve the underlying failure
High	Internal links point to redirected or broken pages	Correct links and destinations
Medium	Repeated title tags on secondary pages	Improve where it matters
Medium	Large images slow key landing pages	Optimise assets and measure results
Low	Minor markup warnings with no practical impact	Review after bigger issues

Your priorities depend on your site’s actual condition. If you’d like these findings turned into a plan, our SEO audit does exactly that.

Technical SEO Mistakes to Avoid

• Blocking all crawlers by accident
• Treating the sitemap as an indexing guarantee
• Removing URLs without planning redirects
• Adding canonical tags without thinking them through
• Redirecting every deleted page to the homepage
• Chasing perfect tool scores instead of helping users
• Assuming every warning needs immediate action
• Changing robots.txt without testing

Related Guides and Services

• New to SEO? Read SEO basics first.
• Find the right page targets with the keyword research guide.
• Improve what crawlers find using the SEO content guide.
• Local business? The local SEO guide covers your next steps.
• Build reputation with the off-page SEO guide.
• See how fixes are scoped on our pricing page.

FAQs

Your Next Step

Start with crawling, indexing, status codes and internal links, then move on to smaller refinements. Next, use the SEO checklist to record what you find, and read the on-page SEO guide for your main pages. Stuck? Ask us to take a look.