For site owners
Add a free link checker to your site
Help your visitors check suspicious links before they click. Copy one snippet of HTML onto your website, blog, intranet, or community page - no JavaScript, no tracking, no sign-up.
Why add it
- Genuinely useful. Your visitors get an instant, plain-language safety check for any link, powered by the same free tool people already trust.
- Private and lightweight. The snippet is plain HTML with inline styles - no JavaScript, no cookies, no third-party requests until someone chooses to check a link. It works under any Content Security Policy.
- Free, forever. Cactus Security is a free public-good project. Embedding it costs nothing and links back to a resource you can stand behind.
Preview
The widget
Copy this HTML and paste it where you want the checker to appear. It opens results on cactus.net in a new tab.
Just a link
Prefer a simple text link instead of a form? Use this minimal badge.
One-click bookmarklet (for yourself)
Want to check the page you're already on? Drag this button to your bookmarks bar. On any suspicious page, click it and Cactus opens a safety check of that page's address.
Drag it to your bookmarks bar - don't click it here.
When a visitor enters a link and submits, their browser opens cactus.net/CheckUrl with that link, where our normal analysis runs. The widget itself sends nothing until then, and we never store the result.