Radar404 — Broken Link Checker

Find broken links on any page — 100% client-side, no tracking, no server. One-click scan of the current tab.

Radar404 checks the hyperlinks on the page you choose and shows which ones are broken, redirected, blocked, or unreachable. For larger audits, crawl a site from the current page with page limits, depth controls, robots.txt support, sitemap seeding, pause/resume, and restart recovery. WHAT YOU GET • One-click scans from the current tab • Full-site crawling with configurable page and depth limits • 404s, 410s, server errors, dead redirects, timeouts, and network failures • Honest handling of 403 and 429 responses as "Blocked" — never falsely Broken • HEAD-first checks with GET confirmation for HEAD-hostile sites • On-page highlights for links that need attention • Searchable, filterable results with response times and final URLs • CSV and JSON reports with spreadsheet-safe exports • Scan history stored locally on your device • Pause, resume, cancel, and browser-restart recovery for crawls • Popup and notifications localized in 10 languages (English, Hindi, Spanish, Portuguese, French, German, Japanese, Simplified Chinese, Korean, Arabic) PRIVACY BY DESIGN Radar404 has no account, server, analytics, telemetry, or third-party SDKs. Scan results, settings, and history stay on your device. When you start a scan, Radar404 contacts the URLs you chose to check them from your browser; those requests are not sent to Radar404 or its developer. ACCESS AND PERMISSIONS Radar404 asks for optional site access only when you start checking links. This lets the extension contact the URLs on the page you selected. Access can be revoked from Settings. Credentials are omitted by default. Radar404 is free, with no upsells and no tracking.