Free website monitoring tools
The same checks Upcheck runs for its customers, open to anyone, one at a time. Each one runs live from outside your network and shows you the evidence, not just a verdict.
- Check SSL certificateOpens a real TLS connection to any hostname and reads back the certificate it serves: issuer, expiry date, subject alternative names, key size, and SHA-256 fingerprint.
- Test SSL certificateConfirms the certificate a server is actually presenting after an install or renewal, so a wrong file or a missing intermediate shows up before your visitors see it.
- Validate SSL certificateChecks that the certificate comes from a trusted issuer, the chain is complete, the names match, and the dates are current, and tells you which check fails.
A single check answers a question. Monitoring keeps answering it.
Every tool here is one of the probes Upcheck runs automatically for the websites it monitors: the uptime request every 5 minutes, the certificate read twice a day. Running one by hand costs us nothing worth charging for, and it shows you exactly what the monitor would see.
What a one-off check can't do is notice when the answer changes. That is where uptime monitoring and SSL monitoring come in: the same checks, re-run on a schedule, with an alert to your team when one fails.
Stop checking by hand.
Add your websites to Upcheck and get alerted by email, Slack, Discord, Teams, or webhook the moment one of these checks fails.