What SSL tools are available?

SSL Certificate Checker, Certificate Key Matcher, CSR Checker, CSR Generator, CSR Decoder and SSL Converter — everything you need to manage SSL/TLS certificates.

A Certificate Signing Request (CSR) is a block of encoded text containing your domain information and public key. You submit it to a Certificate Authority (CA) to obtain a signed SSL certificate.

What certificate formats can I convert?

This tool converts between PEM, DER, P7B, PFX and CRT formats — covering all major SSL certificate formats used by Apache, Nginx, IIS and other servers.

What is the difference between SSL and TLS?

SSL (Secure Sockets Layer) is the older deprecated protocol. TLS (Transport Layer Security) is its modern successor. The term SSL is still commonly used to refer to both protocols.

Security Tools

Free SSL Certificate Tools

Everything you need to manage, check and convert SSL/TLS certificates — free, no signup, no install.

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SSL Certificate Checker

Check expiry, issuer, chain validity and security grade for any domain.

Free

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Certificate Key Matcher

Verify that your SSL certificate matches its private key instantly.

Free

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Check CSR

Decode and validate a Certificate Signing Request — view domain, key type and organisation.

Free

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CSR Generator

Generate a Certificate Signing Request and private key for any domain online.

Free

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CSR Decoder

Decode any CSR and inspect all fields including SAN, key size and algorithm.

Free

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SSL Converter

Convert SSL certificates between PEM, DER, P7B, PFX and CRT formats.

Free

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SSL Cert Generator

Generate a self-signed SSL certificate and private key for development.

Free

About SSL Certificate Tools

What is an SSL certificate?

An SSL/TLS certificate is a digital file that authenticates a website identity and enables encrypted HTTPS connections. It contains the domain name, certificate authority, expiry date and public key. Browsers show a padlock icon when valid.

What is a CSR?

A Certificate Signing Request (CSR) is a block of encoded text generated on your server. It contains your domain name, organisation details and public key. You submit it to a Certificate Authority (CA) who issues your SSL certificate.

How do I check if my certificate and key match?

The Certificate Key Matcher tool extracts the public key from both your certificate and private key and compares them. If they match the certificate was issued for that private key. Mismatched pairs will cause SSL errors on your server.