Free website checkers
Three one-off checks that answer the questions behind most website outages. No account, no ads, no limits.
SSL certificate checker
Expiry date, issuer, hostname match, chain of trust and negotiated TLS version for any host.
Open toolDomain expiry checker
Registration expiry, registrar and decoded registry status codes, read live via RDAP or WHOIS.
Open toolWebsite down checker
Is the site down for everyone or just for you? One probe from outside your network.
Open toolBulk SSL checker
Certificate expiry for up to 10 hosts at once, in one table.
Open toolEmail security checker
SPF, DMARC and DKIM records parsed into plain-language findings and fixes.
Open toolCertificate decoder
Paste a PEM certificate and read what is actually inside it.
Open toolCSR decoder
Check a certificate signing request before you send it to a certificate authority.
Open toolOne check tells you today. Monitoring tells you first.
A manual check is a snapshot. WWT watches certificates, domain expiry, uptime and email records for you and warns you before anything breaks.
Why these three checks
Certificates, domain registrations and email records fail the same way: silently, on a deadline nobody was watching, and usually outside working hours. Each takes seconds to verify by hand, and each takes a site or its email offline when it lapses. These tools run the same checks WWT runs continuously, so you can see exactly what the monitoring would report before deciding whether to automate it.