SSL Certificate & Key Matcher
Verify if a Private Key, SSL Certificate, and/or CSR (Certificate Signing Request) belong together by mathematically comparing their RSA Modulus. 100% Client-Side.
How does it work? (Modulus comparison)
Every RSA Certificate, Private Key, and Certificate Signing Request (CSR) that belongs to the same cryptographic pair shares identical structural math—specifically the RSA Modulus (n). This tool extracts the raw public modulus block from each provided PEM file and compares them directly. If the modulus matches perfectly across all files, they are mathematically guaranteed to be a valid pair. We calculate the MD5 hash of this modulus and print it in the console so you can visually verify the parity yourself.
Why is this tool secure? (Client-Side)
Pasting your server's Private Keys into web applications is traditionally dangerous. However, this SSL Matcher is built using modern JavaScript (`node-forge`) inside a strict Client Component architecture. All parsing and cryptographic modulus math happens locally inside your browser. Your private keys are never transmitted over the network and never reach our servers, guaranteeing absolute zero-knowledge security for your sensitive PKI materials.