Curated picks
Tools
Open a card for a full guide and a browser-only tool — no uploads. Details and external picks are below.
Swipe ›
In-browser tools
Utilities that run locally in your browser — use the topic filter above to narrow the list.
- Base64 encode & decode
Turn text into Base64 and back — UTF-8 safe, in your tab.
In-browser SecurityOpen - HTML entity encode & decode
Escape text for HTML or decode common entities — client-side only.
In-browser SecuritySEOOpen - JSON format & minify
Validate, pretty-print, or compress JSON for configs and APIs.
In-browser PerformanceSecurityOpen - JWT decoder
Inspect header and payload JSON — signature is not verified here.
In-browser SecurityOpen - Meta description length
Count characters and aim for a snippet-friendly range.
In-browser SEOOpen - SHA-256 hash
Fingerprint arbitrary text with SHA-256 — no server round trip.
In-browser SecurityOpen - Unix time converter
Parse ISO strings or Unix seconds/ms into local time and UTC.
In-browser PerformanceOpen - 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.
- Google Search Console
Coverage, indexing issues, and Core Web Vitals for properties you verify.
SEOExternal - Green Web Foundation
Directory and APIs for green hosting verification.
EcologyExternal - GTmetrix
Performance scores, waterfalls, and historical monitoring for a URL.
PerformanceExternal - Mozilla Observatory
HTTP Observatory scan with a simple letter grade.
SecurityExternal - Pa11y
CLI and dashboard-friendly automated accessibility testing.
AccessibilityExternal - PageSpeed Insights
Lab + field data from Lighthouse for any public URL.
PerformanceExternal - Qualys SSL Labs
Deep TLS configuration and certificate chain analysis.
SecurityExternal - 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
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.