Technical SEO: A Complete Guide to Improving Website Performance

Your website looks great, the content is solid, but it's still not ranking on Google. In most cases, the real culprit is a Technical SEO problem. Even the best content and keywords won't help if Google can't properly crawl and index your site — that content will simply never reach the search results.

Technical SEO is essentially about optimizing the backend aspects of your website that affect crawling, indexing, page performance, and overall user experience. It's not just a developer's job — as a marketer or website owner, you can check and fix a lot of it yourself.

In this guide, we'll walk through, step by step, how to run a basic Technical SEO audit on your own website. Follow each step with your own site open in front of you — this isn't just theory, it's a hands-on checklist.

Tutorial promise: By the end of this guide, you'll be able to perform a basic Technical SEO check on your own website and identify exactly where the problems are.

What Is Technical SEO?

In simple terms, Technical SEO means optimizing the technical aspects of a website so that search engines can crawl, index, and render it properly.

Here's a simple way to think about it:

Content is the information on your website, and Technical SEO makes sure search engines can easily find, crawl, and understand that information.

Technical SEO vs. On-Page SEO vs. Off-Page SEO

• On-Page SEO — focuses on content, keywords, headings, and internal links within a page.
• Off-Page SEO — focuses on backlinks, brand mentions, and external signals.
• Technical SEO — focuses on crawlability, indexing, speed, structure, and security.

All three work together to make a website search-friendly. Focusing on just one of them won't give you the full result.

Why Technical SEO Matters

• If a website can't be crawled or indexed, even the best content stays invisible.
• A slow or broken site damages user experience, which in turn affects rankings.
• Google uses mobile-first indexing, so technical issues have a direct impact on rankings.

Is Technical SEO Only for Developers?

No. A lot of basic Technical SEO checks — like indexing status, sitemaps, robots.txt, and broken links — can be done by anyone using Google Search Console and a few free tools. Complex fixes may need a developer, but identifying and understanding the issues is something anyone can learn.

Step 1 — Check Whether Your Website Is Indexed

First, you need to know whether Google is actually indexing your website's pages. If a page isn't indexed, it will never show up in search results.

How to check:

1. Search site:yourdomain.com in Google.
2. Open Google Search Console.
3. Use the URL Inspection tool to test important URLs one by one.

Practical example:

site:example.com

What to look for:

• Whether the URL is indexed
• Whether crawling is allowed
• Any indexing errors (e.g., "Discovered – currently not indexed" or "Crawled – currently not indexed")

Step 2 — Check Your XML Sitemap

What Is an XML Sitemap?

A sitemap is a file that tells search engines which URLs on your site are important and should be crawled.

Tutorial:

• Find your sitemap by visiting yourdomain.com/sitemap.xml or the sitemap index URL.
• Go to Google Search Console → Sitemaps.
• Check whether a sitemap has been submitted.
• Look for any errors.
• Review whether the sitemap contains unnecessary URLs.

Common sitemap mistakes:

• 404 URLs left in the sitemap
• Redirected URLs included in the sitemap
• Noindex pages included in the sitemap
• Duplicate URLs in the sitemap

Step 3 — Review Your Robots.txt

What Is Robots.txt?

Robots.txt is a text file that tells search engine crawlers which URLs they can and can't crawl.

How to check:

yourdomain.com/robots.txt

Then look for:

• Important pages accidentally blocked
• Whether a sitemap reference is included
• Unnecessary sections that need blocking

Important warning: Robots.txt should not be used as a way to permanently remove a page from Google's index. For that, use a noindex tag or a proper removal request.

Step 4 — Find Crawlability & Indexing Issues

This is where the real audit begins. In this step, you'll go through the site to find crawlability and indexing issues.

What to check:

• Pages blocked by robots.txt
• Pages with a noindex tag
• Broken links
• 404 error pages
• Redirect chains
• Redirect loops
• Orphan pages (pages with no internal links pointing to them)
• Duplicate URLs

Tools:

• Google Search Console
• Screaming Frog

Mini Crawl-Audit Workflow:

1. Crawl the entire site with Screaming Frog.
2. Filter URLs by status code (200, 301, 404, 500, etc.).
3. List out pages that are noindex or blocked separately.
4. Find orphan pages with no internal links.
5. Organize all the issues into a spreadsheet, prioritized by impact.

Step 5 — Fix Broken Links & 404 Errors

How to identify them:

• Google Search Console's Coverage report
• Screaming Frog crawl reports

How to fix them:

• If a relevant replacement page exists → set up a 301 redirect to it
• If the link has a typo or error → correct the URL
• If the page was intentionally removed → handle it appropriately (redirect, 410, etc.)
• Update internal links that point to broken pages

Avoid: Automatically redirecting every 404 URL to the homepage. This creates a confusing experience for both users and search engines.

Step 6 — Review Redirects

Understand the basics:

• 301 redirect — permanent, passes most of the SEO value
• 302 redirect — temporary, not suitable as a permanent fix
• Redirect chain — multiple redirects happening one after another
• Redirect loop — a redirect that circles back to itself

Tutorial — Ideal setup:

Old URL → Final URL

Avoid:

Old URL → URL 2 → URL 3 → Final URL

Tools to check: Screaming Frog, browser, or Search Console.

Step 7 — Make Sure Your Website Uses HTTPS

What to check:

• Whether HTTP redirects to HTTPS
• Whether the SSL certificate is valid
• Whether there's any mixed content
• Whether internal links point to HTTPS versions
• Whether canonical URLs are HTTPS

Quick test:

http://example.com

→ should properly resolve to →

https://example.com

Step 8 — Improve Website Speed & Core Web Vitals

This is one of the most important sections in this article.

What Are Core Web Vitals?

• LCP (Largest Contentful Paint) — measures loading performance. Good: under 2.5 seconds.
• INP (Interaction to Next Paint) — measures responsiveness. Good: 200 milliseconds or less. It officially replaced the older First Input Delay (FID) metric back in March 2024, so any guide still mentioning FID is outdated.
• CLS (Cumulative Layout Shift) — measures visual stability. Good: 0.1 or less.

Google evaluates all three metrics at the 75th percentile (p75) of real user data — meaning a page only "passes" when at least 75% of real visits hit the "good" threshold.

INP remains the hardest metric to pass. A large share of websites still fail the 200ms threshold, mainly because fixing it requires deep, JavaScript architecture-level changes rather than quick tweaks.

How to test:

• Google PageSpeed Insights
• Search Console → Core Web Vitals report

Common performance problems:

• Large images
• Unused JavaScript
• Render-blocking resources
• Poor caching
• Excessive third-party scripts
• Slow server response

Basic fixes:

• Compress images
• Use modern image formats (WebP/AVIF)
• Enable browser caching
• Minimize unnecessary scripts
• Optimize fonts
• Reduce overall page weight

Step 9 — Check Mobile-Friendliness

Google primarily uses the mobile version of a site's content for indexing and ranking, so mobile SEO should be part of every technical audit.

What to check:

• Whether the responsive design actually works
• Text readability (font size, spacing)
• Whether buttons/tap targets are large enough
• Horizontal scrolling issues
• Smooth mobile navigation
• Content consistency between desktop and mobile

Tool: Google Search Console + direct testing on browser/device.

Step 10 — Check Your Site Architecture

Technical SEO isn't only about fixing errors — your site also needs a logical structure.

Example of an ideal structure:

Homepage
   ↓
Service Category
   ↓
Service Page
   ↓
Supporting Content

What to check:

• Whether important pages are reachable within a reasonable number of clicks
• Whether categories are logical
• Whether internal linking is strong
• Whether there are any orphan pages
• Whether navigation is consistent across the site

Step 11 — Review Canonical URLs & Duplicate Content

Understand the basics:

• What is a canonical tag — it tells search engines which version is the "main" one among duplicate or similar pages
• Why duplicate URLs cause problems — search engines get confused about which version to rank
• When canonicalization is useful — when the same content is available on multiple URLs (e.g., via filter/sort parameters)

Tutorial — check your important pages for:

• A correct canonical URL
• A self-referencing canonical where appropriate
• A canonical pointing to the wrong page
• Conflicting canonical signals

Common mistakes:

• Canonical pointing to a 404 page
• An HTTP canonical set on an HTTPS page
• Conflicting canonical signals across different locations (header vs. sitemap)

Step 12 — Check Structured Data

Understand the basics:

• What structured data is — a standardized format (typically Schema.org) that helps search engines understand your content
• Why it helps — search engines can interpret content more accurately
• Common types: Article, Breadcrumb, Organization, Product, Local Business

Tutorial:

1. Identify the appropriate schema type for your content.
2. Add valid structured data code.
3. Make sure the structured data represents the visible content on the page.
4. Validate it using Google's Rich Results Test.
5. Monitor structured data issues in Search Console regularly.

Note: Structured data doesn't guarantee rich results or higher rankings — it only helps search engines understand your content better.

Step 13 — Check JavaScript & Rendering Issues

This section is a bit more advanced, but useful to understand.

Understand the basics:

• Why JavaScript can affect crawling and rendering
• Content hidden behind JavaScript that search engines may miss
• Issues caused by client-side rendering
• Important links or content that search engines might struggle to access

Basic check:

1. Use View Source in your browser to see the raw HTML.
2. Inspect the rendered page using Developer Tools.
3. Compare the raw HTML with the visible content.
4. Use the URL Inspection tool in Search Console to see the "rendered" version.

Step 14 — Run a Complete Technical SEO Audit

Now let's bring everything from the steps above together into one practical audit workflow.

Technical SEO Audit Workflow:

1. Crawl website
      ↓
2. Check indexation
      ↓
3. Review sitemap
      ↓
4. Check robots.txt
      ↓
5. Find broken links
      ↓
6. Review redirects
      ↓
7. Check HTTPS
      ↓
8. Test Core Web Vitals
      ↓
9. Check mobile experience
      ↓
10. Review canonical tags
      ↓
11. Check structured data
      ↓
12. Review site architecture
      ↓
13. Prioritize issues
      ↓
14. Fix → Re-test → Monitor

Following this workflow gives you a systematic, repeatable audit process you can reuse regularly.

Technical SEO Checklist

• Website is crawlable
• Important pages are indexed
• XML sitemap works
• Robots.txt is correctly configured
• No critical broken links
• No redirect chains/loops
• HTTPS works correctly
• Core Web Vitals reviewed
• Mobile experience checked
• Site architecture is logical
• Canonicals are correct
• Duplicate URLs reviewed
• Structured data validated
• Important content is accessible
• Technical issues re-tested after fixes

Best Technical SEO Tools

• Google Search Console — indexing, search performance, Core Web Vitals
• Screaming Frog — full technical site crawl
• PageSpeed Insights — performance and Core Web Vitals testing
• Google Rich Results Test — structured data eligibility check
• Google Analytics — user behavior and traffic analysis
• Ahrefs / Semrush — technical audits and competitor insights

Common Technical SEO Mistakes

• A sitemap exists but is never updated
• Important pages accidentally marked noindex
• Critical resources blocked via robots.txt
• HTTP/HTTPS inconsistency
• Redirect chains left in place
• Oversized images
• Poor mobile experience
• Duplicate pages left unresolved
• Incorrect canonical setup
• Orphan pages
• Making decisions based on PageSpeed score alone, ignoring real user experience

Technical SEO vs. On-Page SEO

If On-Page SEO covers content, keywords, titles, headings, internal links, and search intent, Technical SEO covers crawlability, indexing, sitemaps, robots.txt, speed, and canonical URLs. Both work together to make a website fully SEO-friendly. If On-Page SEO is about "optimizing the content," Technical SEO is about "keeping the road clear so that content can actually reach the search engine."

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Frequently Asked Questions

What is Technical SEO?
Technical SEO is the process of optimizing a website's crawling, indexing, speed, and structure so that search engines can easily find, understand, and rank it.

Is Technical SEO necessary for small websites?
Yes. Regardless of size, if a website isn't crawlable and indexable, its content will never reach the search results.

Can I do a Technical SEO audit myself?
Yes, most basic audits (indexing, sitemap, robots.txt, broken links, speed) can be done yourself using Google Search Console and free tools. Complex issues may require developer help.

Which Technical SEO issues should I fix first?
Issues that directly block crawling or indexing (like an incorrect robots.txt, wrong noindex tags, or a broken sitemap) should be fixed first. After that, focus on speed and mobile experience.

Does website speed directly improve Google rankings?
Speed is a ranking factor, but not the only one. A slow website hurts user experience, which indirectly affects rankings.

How often should I perform a Technical SEO audit?
A full audit every 3–6 months is generally a good practice, and you should always re-check after any major site changes.

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Technical SEO isn't about making a website complicated. It's about removing the technical barriers that prevent search engines and users from accessing your website properly. By following the 14 steps above, you can run a basic but effective Technical SEO audit on your own website — and that's exactly where real improvement starts.

If, after auditing it yourself, you feel you need deeper fixes and optimization, PixGen Digital's SEO service can help — from resolving indexing issues to optimizing Core Web Vitals.

Next:
Prevous: On-Page SEO: The Complete Step-by-Step Guide to Optimizing Your Website

About the Author: Hafsa Akter