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Free tools
Free SSL/TLS Tools
Practical tools to check, decode and prepare your certificates. The CSR and DNS tools run entirely in your browser - nothing is sent to us.
Diagnostics
SSL Certificate Checker
Enter a domain to see its live certificate - issuer, expiry, days remaining, covered domains, chain and whether it is trusted.
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CSR
CSR Decoder
Paste a CSR to decode and verify its contents - domain, organisation, key size and signature algorithm. Runs entirely in your browser.
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CSR
CSR Generator
Generate a private key and CSR in your browser with WebCrypto. Your private key never leaves your device and is never sent to us.
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DNS
DNS, DCV & CAA Checker
Look up a domain's A, CNAME, TXT and CAA records to confirm a validation record is live and see which CAs are allowed to issue.
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Prefer step-by-step help? Read the SSL/TLS guides →