What is technical SEO?
Technical SEO doesn't touch a word of your copy - it's whether Google can reach, read and trust the pages you've already written. Get it wrong and even great content never gets a chance to rank.
Crawling: can Google reach every page
Search engines find pages by following links, starting from ones they already know. If a page has no internal links pointing to it, sits behind a login, or is blocked in robots.txt, Google may never see it at all. Check your XML sitemap lists every page you want indexed, and that robots.txt isn't accidentally disallowing whole sections - a common mistake after a site rebuild.
Indexing: found is not the same as ranked
Google can crawl a page and still choose not to index it - usually because the content is thin, duplicated elsewhere on your site, or marked noindex by a leftover staging tag. Search Console's Page Indexing report shows exactly which URLs are excluded and why. A site with 200 pages and 60 indexed has a real problem worth chasing before touching content.
Site structure and internal links
A flat structure, where every important page is a click or two from the homepage, spreads authority evenly and helps both crawlers and visitors find their way. Orphan pages with zero internal links, and categories buried five clicks deep, are the two most common structural faults. Internal links also tell Google which pages you consider most important - so link to them accordingly.
Structured data (schema markup)
Schema is code that states facts about your page in a format machines parse without guessing - this is a product, this is its price, this is an FAQ with these exact answers. It doesn't guarantee rich results, but it removes ambiguity that would otherwise cost you a chance at one. Organization, Product, FAQPage and BreadcrumbList are the schema types most sites are missing.
Speed and mobile usability
Core Web Vitals and mobile-friendliness are technical SEO too - they're ranking signals Google measures directly rather than infers. A page that's slow or breaks on a phone screen is a technical fault, not a content one, and no amount of rewriting fixes it.
How to check yours without guessing
Most of this is invisible until you look - crawl errors, index bloat, and missing schema rarely show up just from browsing your own site. A scan that checks crawlability, indexing signals, structured data and Core Web Vitals together, rather than one at a time, is the fastest way to find out which of these is actually costing you. AuditHQ's Technical suite runs hundreds of these checks in one pass.
Frequently asked questions
Is technical SEO different from content SEO?
Yes. Technical SEO is whether search engines can access and understand your site at all - crawling, indexing, speed, structured data. Content SEO is whether what is on the page actually answers the query well. Both matter, but a technical fault can make great content invisible regardless of quality.
Do I need a developer to fix technical SEO?
Often, no. Sitemap and robots.txt fixes, basic schema, and image compression are doable on most CMS platforms without code. Deeper issues, like rendering problems, server response times, or complex redirect logic, usually need developer help, but a proper diagnosis first means you only pay for what is actually broken.
How often should I check technical SEO?
After any redesign, migration or platform change, always - these are the most common causes of sudden ranking drops. Otherwise, a quarterly check catches drift before it compounds: a forgotten noindex tag or broken sitemap can sit unnoticed for months and quietly erase your search visibility.