Website diagnostics and web utilities

Check whether a website is understandable, crawlable, and trustworthy for AI and search systems.

Review HTTP security headers and get practical recommendations.

Fetch robots.txt, inspect rules, and test whether a path can be crawled.

Inspect XML sitemaps, sitemap indexes, URL counts, and lastmod coverage.

Preview titles, descriptions, canonical links, OpenGraph tags, and social cards.

Validate JSON-LD and find missing recommended structured data fields.

Look up A, AAAA, CNAME, MX, TXT, NS, CAA, and SOA records.

Trace redirect hops, final URLs, loops, and avoidable redirect chains.

Check a URL's status code, final URL, response time, and selected headers.

Test preflight and simple CORS responses without exposing response bodies.

Format, validate, minify, and sort JSON in the browser.

Decode JWT headers and payloads locally without sending tokens to a server.

Encode and decode Base64 text with Unicode and URL-safe support.

Generate SHA hashes and HMAC values with Web Crypto.

Generate UUID, NanoID, and ULID values locally.

Build cron expressions and preview upcoming run times.

Convert Unix timestamps, milliseconds, ISO dates, local time, and UTC.

Encode, decode, parse, and build URL query strings.

Build campaign URLs with encoded UTM parameters.

Generate static QR codes for text and URLs.