10 Steps To Boost Your Site’s Crawlability And Indexability Ep. 557
If search engines can’t find your web pages, all the optimization in the world will do no good. Boost your site’s crawl ability and indexability to…
Technical SEO
Updated June 2026 · By Matthew Bertram, CEO of EWR Digital
The short answer
Technical SEO is the work of making a website easy for search engines to crawl, render, index, and understand. It covers crawlability, indexation, site speed, mobile-friendliness, structured data, and site architecture. Strong technical SEO does not earn rankings by itself, but without it, good content and links cannot perform.
What technical SEO is and why it matters
Technical SEO is the set of site-level optimizations that let search engines crawl, render, index, and understand your pages. It is the plumbing under content and links. If Google cannot access a page or read it correctly, no amount of writing or backlinks will rank it.
Think of SEO in three layers: technical (can search engines reach and process the page), on-page (does the content match the query), and off-page (do other sites vouch for you). Technical SEO is the layer that makes the other two count.
- Crawlability: search engine bots can find and access your URLs.
- Indexability: those URLs are eligible to be stored and served in results.
- Renderability: the page's real content appears after the browser runs HTML, CSS, and JavaScript.
- Site architecture: internal links and URL structure pass authority to important pages.
Crawling and indexing: how to get found in Google
To get indexed, you need a crawlable page that returns a 200 status, is allowed by robots.txt, has no noindex tag, and is reachable through internal links or an XML sitemap. Crawling and indexing are two separate steps: Google must first fetch the page, then decide to store it.
- robots.txt: tells bots which paths they may crawl. It controls crawling, not indexing. A blocked page can still appear in results if it is linked elsewhere.
- XML sitemap: lists the URLs you want crawled and helps Google discover deep or new pages. Submit it in Google Search Console.
- noindex meta tag: the correct way to keep a page out of the index. The page must stay crawlable for Google to see the tag, so do not block it in robots.txt.
- canonical tag: tells Google which version of duplicate or similar pages is the primary one to index.
- URL Inspection tool: in Search Console, checks whether a specific URL is indexed and lets you request indexing.
To fix common crawl errors: return proper status codes (200 for live pages, 301 for moved pages, 404 for gone pages), repair broken internal links, remove redirect chains, and make sure no important page is accidentally blocked by robots.txt or a stray noindex.
Site speed and Core Web Vitals
Core Web Vitals are three Google metrics that measure loading, interactivity, and visual stability, and they are a confirmed ranking signal. Pages that load fast and stay stable give a better experience and are easier to crawl at scale. Speed matters most on mobile, where connections are slower.
| Metric | What it measures | Good threshold |
|---|---|---|
| LCP (Largest Contentful Paint) | Loading: time until the main content renders | Under 2.5 seconds |
| INP (Interaction to Next Paint) | Responsiveness: delay after a user interaction | Under 200 milliseconds |
| CLS (Cumulative Layout Shift) | Visual stability: unexpected layout movement | Under 0.1 |
To improve these scores: compress and lazy-load images, serve next-gen formats like WebP, set width and height on images and embeds to prevent layout shift, reduce and defer JavaScript, use a content delivery network, and enable caching. Measure with PageSpeed Insights and the Core Web Vitals report in Search Console, which uses real-user field data.
Structured data and schema markup
Structured data is code, usually JSON-LD, that labels your content so search engines understand what each element means. It does not directly boost rankings, but it makes pages eligible for rich results like FAQs, review stars, recipes, and breadcrumbs, which can raise click-through rate.
- Pick the schema type that matches the page: Article, Product, FAQPage, HowTo, LocalBusiness, Organization, or Event.
- Add it as JSON-LD in the page head or body. JSON-LD is the format Google recommends.
- Make sure the markup describes content that is actually visible on the page. Marking up hidden or fake content violates Google's guidelines.
- Validate with the Rich Results Test and Schema Markup Validator before publishing.
Start with Organization and Article or Product schema, then add FAQPage or Breadcrumb where it fits. Do not fabricate reviews or ratings in markup. Faked review schema is a guidelines violation and can trigger a manual action.
JavaScript SEO and rendering
JavaScript SEO is making sure content that loads through JavaScript is still crawlable and indexable. Google renders JavaScript, but rendering happens in a second pass that can be delayed, and content that only appears after a click or scroll may never be seen. The safest approach is to deliver important content and links in the initial HTML.
- Use server-side rendering or prerendering for content you need indexed.
- Put primary content and internal links in the HTML response, not behind user interactions.
- Use real anchor tags with href attributes for links, not click handlers, so crawlers can follow them.
- Test rendered output with the URL Inspection tool's rendered HTML and screenshot.
Common technical SEO issues and fixes
Most technical SEO problems fall into a short list of recurring issues. Run a crawl with a tool like Screaming Frog or use Search Console reports to find them, then work through the table below by priority.
| Issue | Why it hurts | Fix |
|---|---|---|
| Page blocked by robots.txt or noindex | Page cannot be crawled or indexed | Remove the block or tag from pages you want ranked |
| Broken links and 404s | Wastes crawl budget, hurts users | Fix or redirect with a 301 to a relevant page |
| Redirect chains and loops | Slow crawling, lost link equity | Point redirects directly to the final URL |
| Duplicate content | Splits signals across URLs | Set a canonical tag to the preferred version |
| Missing or broken XML sitemap | Hard for Google to discover pages | Generate a clean sitemap and submit it in Search Console |
| No HTTPS | Security signal and trust issue | Install an SSL certificate and redirect HTTP to HTTPS |
| Slow Core Web Vitals | Worse experience and ranking signal | Optimize images, reduce JavaScript, add caching |
| Not mobile-friendly | Google indexes the mobile version first | Use responsive design and test on real devices |
Work top down: fix anything blocking crawling or indexing first, then resolve duplicate content and redirects, then tune speed and mobile experience. Re-crawl after changes to confirm the fixes held.
Frequently asked questions
What is technical SEO in simple terms?
Technical SEO is the work of making a website easy for search engines to crawl, read, and index. It covers things like site speed, mobile-friendliness, structured data, XML sitemaps, and clean URL structure. It does not write your content, but it makes sure search engines can actually find and understand the content you have.
How do I get my site indexed by Google?
Make sure the page returns a 200 status, is not blocked by robots.txt, and has no noindex tag. Link to it from other pages on your site and include it in your XML sitemap. Then submit the URL in Google Search Console using the URL Inspection tool and request indexing. Indexing can take days to weeks.
Are Core Web Vitals a ranking factor?
Yes. Core Web Vitals are a confirmed Google ranking signal as part of page experience. The three metrics are LCP (loading, target under 2.5 seconds), INP (responsiveness, under 200 milliseconds), and CLS (visual stability, under 0.1). They are not the strongest factor, but they help when other signals are close.
What is the difference between robots.txt and a noindex tag?
Robots.txt controls crawling: it tells search engines which paths they may or may not fetch. A noindex tag controls indexing: it tells search engines not to store a page in results. To remove a page from search, use noindex and keep the page crawlable, because Google must crawl it to see the noindex tag.
Does structured data improve rankings?
Structured data does not directly raise rankings. What it does is make pages eligible for rich results like review stars, FAQs, and breadcrumbs, which can increase click-through rate from search. Higher click-through and better understanding of your content can help indirectly, but the markup itself is not a direct ranking factor.
Can Google index content loaded with JavaScript?
Yes, Google renders JavaScript and can index content it generates, but rendering happens in a delayed second pass and is not guaranteed for everything. Content hidden behind clicks or infinite scroll may be missed. For reliable indexing, deliver important content and links in the initial HTML using server-side rendering or prerendering.