SSL Certificate Checker
Certificate issuer, expiry, HSTS and HTTPS health for any domain.
Enter a domain to see its certificate issuer, validity and HTTPS health.
How the SSL Certificate Checker works
SSL Certificate Checker is a free browser tool on toolmix.io: certificate issuer, expiry, hsts and https health for any domain.
Enter or paste your input on the left and the result updates immediately — no sign-up, no upload queue for the tools that run locally.
Copy or download the output in one click, then jump to any other utilities utility from the sidebar.
Frequently asked questions
Is SSL Certificate Checker free to use?
Yes. Everyday use is free. A free account also saves your history, while watermark-free exports and higher AI limits come with a paid plan.
Do I need to create an account to use SSL Certificate Checker?
No. You can use it as a guest. Signing in adds saved history, and paid plans add higher AI limits and clean, watermark-free exports.
Is my data kept private?
Text and image tools that can run in your browser do exactly that, so the content never leaves your device. AI tools send your prompt or file to the model provider only to produce the result.
Does SSL Certificate Checker work on mobile?
Yes. The layout adapts to phones and tablets, so you can use it on the go without horizontal scrolling.