Canonical tag errors: how to find and fix them
Canonicals pointing to redirects, errors or noindex pages, multiple canonicals and missing ones. How to audit rel=canonical across a site and fix what's broken.
Posts by Dien Ho
How to check Core Web Vitals for every page on your site
PageSpeed Insights tests one URL at a time. How to audit LCP, INP and CLS across a whole site with real-user CrUX data, and what to fix first.
Custom extraction for SEO: 8 things to pull from every page
Use CSS selectors and regex to extract prices, authors, dates, analytics tags and schema fields from every page, then flag pages with custom rules.
How to find duplicate and near-duplicate content on your site
Exact and near-duplicate pages, duplicate titles and descriptions. How to find them across a site and when to redirect, canonicalise or rewrite.
Hreflang errors: the 5 most common mistakes and how to fix them
Invalid codes, missing return links, non-indexable alternates, no self-reference, no x-default. How to find and fix the hreflang errors that break SEO.
HTTPS and mixed content: how to find and fix insecure pages
Pages still on HTTP, HTTP that doesn't redirect, and images or scripts loaded insecurely on HTTPS pages. How to find them across a site and fix them.
Image SEO audit: missing alt text and broken images
How to find images without alt text and images that fail to load across a whole site, write alt text that helps, and handle decorative images correctly.
Internal linking audit: click depth, weak pages and dead ends
How to audit internal links across a site: pages buried too deep, pages with one link, dead ends, internal nofollow and broken links.
Log file analysis for SEO: see what Googlebot really crawls
Server logs show every request Googlebot actually makes. How to verify real Googlebot, find crawl errors and wasted crawls, and spot pages Google never visits.
Noindex vs robots.txt: which to use, and the mistakes that hide pages
Robots.txt controls crawling; noindex controls indexing. How each works, why combining them backfires, and how to find pages hidden or exposed by mistake.
Orphan pages: how to find them and what to do with them
Orphan pages have no internal links pointing to them, so users and crawlers struggle to find them. How to find them with sitemaps, Search Console and logs.
Redirect chains: how to find and fix them
What redirect chains and loops are, why they slow crawling and users down, and how to find and fix every one on your site in a single pass.
Site migration SEO checklist: crawl before, during and after launch
A site migration checklist built around crawls: benchmark the old site, test redirects, check the new site before launch, catch regressions after.
Structured data errors: how to find and fix them across a site
Broken JSON-LD and missing required properties cost rich results. How to audit schema markup across every page, not one URL at a time, and fix it.
Title tag and meta description audit: find and fix every problem
Missing, duplicate, too long or too short: how to audit titles, meta descriptions and H1s across a site, and rewrite the ones that cost clicks.
XML sitemap audit: what to check and how to fix it
Sitemaps full of redirects, errors and noindex pages lose Google's trust. How to audit XML sitemaps against a crawl and keep only indexable URLs.
How to use Claude for a technical SEO audit (with MCP)
Connect Crawlens to Claude over MCP and turn a long issue list into a prioritised, developer-ready plan built on your own crawl data.
JavaScript SEO: raw vs rendered HTML, and what to fix
Titles, canonicals, links or content that only appear after JavaScript runs are invisible to many crawlers. How to compare raw and rendered HTML.
Striking distance keywords: how to find your page-two wins
Page-two rankings get almost no clicks but are often the cheapest wins. How to find them with Search Console and a crawl, and what to fix first.