More tools.

Check whether a site returns a real 404 for a missing page instead of a soft 404, redirect, or server error.

Check one page's Lighthouse accessibility score and explain every failed audit in plain English.

Check up to 200 unique links on one page and see broken destinations first with each HTTP status.

Check a page's canonical URL and hreflang links for conflicts, chains, and missing return links.

A free crawler access check for search engines and AI bots.

See what a cron expression means, its next five runs, and whether Cloudflare, GitHub Actions, Vercel, and AWS accept it.

Checks a domain's Domain Rating by Ahrefs, free, with the source next to the number.

Read Exif, XMP, and IPTC photo metadata locally, then download a clean copy without changing the encoded picture.

Check whether a username is free, taken, or could not be checked on GitHub, npm, X, Reddit, Bluesky, and more.

Check the security headers a public site sends: HSTS, CSP, framing, content type, referrer, and permissions, with the line to add for each gap.

Paste or open one JSON document, edit it as code or a tree, and leave with valid data that never leaves the browser.

Decode a JWT, read its expiry in plain words, and verify its signature locally with a public key or JWKS URL.

A free llms.txt validator for sites and documentation.

Validate one OpenAPI document for structural errors, broken references, incomplete operations, and authentication gaps.

Turn one base price in US dollars into a purchasing power parity price per country, from what Apple Music and Netflix charge locally and World Bank price levels.

Shows how a link looks on X, LinkedIn, Slack, Discord, and iMessage, drawn from the page's own tags.

Turn one URL or text value into a downloadable QR code, locally and without a tracking redirect.

Trace every HTTP redirect hop, its status code, and the final URL.

Inspect a page's JSON-LD and check common Google search feature requirements, with each rule linked.

Check a site's security.txt against RFC 9116: location, media type, redirects, format, Contact, Expires, Canonical, and signature, with the fix for each gap.

Check a site's sitemap: found through robots.txt, well formed, the URL count, same host, lastmod, and ten sampled pages with their status codes, with the fix for each gap.

Check whether a domain's apex and www hosts resolve and redirect to one canonical home.