More tools.

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

See a page's Lighthouse accessibility score and get plain English explanations of failed audits.

Find broken links on one page, checking up to 200 unique destinations and showing each HTTP status.

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

Check crawler access for search engines and AI bots.

Check a site's security headers and get suggested fixes.

Validate a site's llms.txt and find formatting or link issues.

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

Preview how a link appears on X, LinkedIn, Slack, Discord, and iMessage using 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 and see what needs fixing.

Validate a site's sitemap, check up to ten sampled pages, and see what needs fixing.

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

Check whether a domain and its www address resolve and redirect to the same URL.

Find CSV formatting errors, preview repairs, and export CSV or JSON in your browser.

Read and remove photo metadata in your browser without uploading the image.

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

Inspect a calendar file's event times, recurring schedules, and time zone issues in your browser.

Validate and edit JSON as code or a tree, with your data kept in your browser.

Merge, reorder, rotate, remove, and extract PDF pages in your browser.

Create a downloadable QR code from a URL or text in your browser, without a tracking redirect.

Build UTM campaign links and save 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, check its expiry, and verify its signature locally with a public key or JWKS URL.

Check an OpenAPI document for structural errors, broken references, and missing operation or authentication details.

Check username availability on GitHub, npm, X, Bluesky, and other platforms.

Turn a US dollar price into suggested country prices using local subscription prices and World Bank data.