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.

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

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

A free llms.txt validator for sites and documentation.

Find sitemap pages that no other fetched page links to, across up to 200 pages.

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

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 a page's mobile and desktop speed, Core Web Vitals, and the three fixes worth doing first.

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

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

Inspect failed and slow requests in a HAR file, entirely in your browser.

Inspect a calendar file locally to explain event times, recurrence, and unresolved timezones.

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

Combine, reorder, rotate, remove, and extract PDF pages locally in one private browser workspace.

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

Builds UTM campaign links and remembers presets and recent links in your browser.

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

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

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

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

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.