Free SSL Tools — Checker, Decoder & More
SSL Checker, certificate & CSR decoder, key matcher, format converter. All free, no signup, right in your browser.
Our free SSL toolkit handles everyday certificate tasks right in your browser: the SSL Checker inspects a domain's certificate installation and expiry; the Certificate Decoder shows what's inside a certificate; the CSR Decoder parses a signing request; the Key Matcher confirms whether a certificate and private key belong together; and the SSL Converter changes between PEM, DER, PFX and PKCS#7 formats. The decoder, matcher and converter run entirely in your browser — your files and private key are never sent to our server.
Frequently Asked Questions
Are the tools free?
Yes, all of them are completely free and require no account.
Is my data safe?
Certificate/CSR decoding, key matching and format conversion happen in your browser; data never leaves your device. Only the SSL Checker is server-side, because it must connect to the target server.
Can I also get a certificate?
Yes. Use our free SSL wizard to generate and download a 90-day certificate in minutes.