Free Broken Link Checker
Enter any page URL to find its broken links (dead 404s, timeouts, unreachable targets) and insecure mixed-content resources — instant, free, no signup. Then let Merlonix crawl your whole site and alert you the moment a new link breaks.
What counts as a broken link?
A broken link is one whose target does not resolve: it returns an HTTP error status (a 404 Not Found, a 410 Gone, or a 5xx server error), it times out, or the connection fails outright. This tool fetches each link on the page you enter and reports any target that isn't reachable (a 2xx or 3xx response). A link that redirects is treated as working — a redirect still resolves. Redirect chains that our safe fetch declines to follow past one hop, and links to private/internal hosts, are skipped rather than falsely flagged.
What is mixed content and why does it matter?
Mixed content is an insecure http:// resource — an image, script, or stylesheet — loaded by a page served over https://. Browsers block or downgrade mixed content, which can break page functionality and removes the padlock/secure indicator, undermining the trust your TLS certificate is supposed to provide. This tool flags any http:// subresource referenced from an https:// page so you can switch it to https://.
Does this check my whole site?
No — the free tool checks a single page: the exact URL you enter. It fetches that page, extracts its links and subresources, and probes each one (up to a per-scan cap). That is deliberate: it keeps the free check fast and bounded. To find broken links across every page of a site you need a crawl, and to catch a link the day it breaks you need continuous monitoring — that's the paid Merlonix monitor, which BFS-walks the whole site on a schedule and alerts you on the first new breakage.
Why do links break on their own?
Links rot. An external page you cite gets deleted or moved; a product or documentation URL changes during a site migration; an image is removed from a CDN or its bucket path changes; a partner's site is reorganized. None of these touch your code, so nothing warns you — the link just quietly starts returning a 404, and it stays broken until a visitor (or a search crawler) hits it. A one-time check catches today's breakage; only continuous monitoring catches tomorrow's.
How do I keep broken links from hurting SEO and conversions?
Broken links waste crawl budget, leak link equity, and send visitors to dead ends right when they were engaged — a broken checkout or docs link is lost revenue. A single scan is a snapshot. Claim the free Merlonix plan ($0, no credit card) to monitor a few sites continuously, or start a trial to crawl your whole portfolio. Merlonix re-crawls on a schedule and alerts you when a new broken link or mixed-content resource appears, so you fix it before customers or Google find it.