Curated picks
Tools
Open a card for a full guide and a browser-only tool — no uploads. Details and external picks are below.
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In-browser tools
Utilities that run locally in your browser — use the topic filter above to narrow the list.
- HTML entity encode & decode
Escape text for HTML or decode common entities — client-side only.
In-browser SecuritySEOOpen - Meta description length
Count characters and aim for a snippet-friendly range.
In-browser SEOOpen - URL encode & decode
Percent-encode query values or decode escaped strings.
In-browser SEOOpen - URL slug generator
Turn titles into clean path segments for blogs and static routes.
In-browser SEOOpen
Hand-picked from the web
Editorial bookmarks for audits and research — each opens in a new tab at the provider.
- Bing URL Inspection
See how Bing crawls and indexes a URL.
SEOExternal - Can I use
Browser support tables for HTML, CSS, and JavaScript features.
PerformanceSEOExternal - Google Search Console
Coverage, indexing issues, and Core Web Vitals for properties you verify.
SEOExternal - Rich Results Test
Validate structured data Google can use for rich results.
SEOExternal - Schema Markup Validator
Schema.org validation for JSON-LD, Microdata, and RDFa.
SEOExternal - W3C CSS Validator
Check CSS for errors and warnings.
PerformanceSEOExternal - W3C Markup Validator
Validate HTML documents for syntax and parse errors.
PerformanceSEOExternal
Further down you will find hand-picked third-party tools we use in audits (each opens in a new tab), plus links to our topic hubs and the rest of the site.
For deeper reading, jump into our topic hubs. Everything here opens in a new tab on the provider’s site.
Explore our Performance, Ecology, Accessibility, Security, and SEO hubs for deeper reading.