Broken link checker and mixed content checker
Once a day Lampwick crawls up to 250 pages of your site, checks every link, internal and external, lists mixed content and alerts on new findings.
The site crawl is a broken link checker that runs by itself. Once a day Lampwick follows the links of your site, up to 250 pages, checks every link it finds (external ones too), and lists http:// resources on https pages: mixed content, which browsers block or warn about. When a crawl finds something new, your team gets one alert with the counts. You turn it on per uptime monitor.
What you get
- Broken links, grouped. 5xx, 404, other 4xx and connection errors (DNS, TLS, timeouts, redirect loops), with a filter for Internal and External, and the pages each link is on.
- Mixed content. Every
http://image, script, stylesheet, iframe, video, audio, embed andurl(...)in an inlinestyleon yourhttpspages, listed once each with the pages it appears on. - Only new findings alert. After the first crawl, an alert says "12 broken links (2 new) on 183 pages". The same findings alert at most once per 30 days.
- Needs login, kept apart. Links that answer 401 or 403 are listed separately and never alert.
- Ignore a link you know about, such as a partner site that blocks bots. Up to 1,000 per monitor.
- Crawl now after you fix something, once per 10 minutes, and Recent crawls with the latest 30 runs.
- It respects
robots.txt(thelampwickgroup, otherwise*) andnofollow, sends one request at a time, 250 ms apart, and stores URLs and status codes, never page content.
How to check for broken links without a tool
For a one-off check, open your browser's developer tools on a page and look at the Console for mixed content warnings and the Network tab for red 404s. That covers one page. A site with a blog, docs or a shop changes every week, and external sites you link to move or vanish without telling you. A daily crawl catches those.
Set it up
- Add an uptime monitor for your site, or open an existing one under Uptime.
- On the Site crawl: broken links & mixed content card, click Turn on site crawl. The first crawl starts within a minute or two.
- If the monitor checks a health endpoint such as
/up, set Start crawl at to your homepage. - If a firewall or bot protection filters crawlers, allow the User-Agent
lampwick-crawler.
Rules, limits and error messages: the site crawl docs.
What it doesn't do
| Limit | Value |
|---|---|
| Pages per crawl | 250, up to 10 clicks deep from the start page |
| Size | 2 MB per page, 50 MB per crawl; only HTML is read |
| External links | 500 per crawl, ports 80 and 443 only |
| Time | 10 minutes per crawl |
| Monitors with a crawl | 10 per team, 20 over all teams one owner owns |
- It doesn't run JavaScript. A single-page app that draws its links with JavaScript shows few links to follow.
- It reads
<a href>links. It doesn't check SEO meta tags, page speed, spelling or images for size. - It crawls once a day, not after every deploy; use Crawl now for that.
What it costs
The site crawl is included from Pro: €29 per team per month, also Team (€79) and Business (€199). It isn't on Free. See pricing.
Related
- The certificate behind your
httpspages: SSL certificate expiry monitoring. - Links that broke after an edit, and four other ways an app goes offline: how to know when your app is down.
- Built with Lovable, Replit or v0: monitoring for AI-built apps.
Start free, add your site, and turn on the crawl on Pro.