What is a certificate fingerprint?

A fingerprint (thumbprint) is the hash of the DER-encoded certificate. It uniquely identifies the certificate and is used for certificate pinning and manual verification.

Which fingerprint format should I use?

SHA-256 is recommended for new applications. SHA-1 is included for compatibility with legacy systems.

Certificate Fingerprint Calculator

Calculate SHA-1 and SHA-256 fingerprints of a PEM certificate in colon-separated hex.

$PEM Certificate

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FAQ

What is a certificate fingerprint?: A fingerprint (thumbprint) is the hash of the DER-encoded certificate. It uniquely identifies the certificate and is used for certificate pinning and manual verification.
Which fingerprint format should I use?: SHA-256 is recommended for new applications. SHA-1 is included for compatibility with legacy systems.

Paste a PEM certificate and compute its SHA-1 and SHA-256 fingerprints. Fingerprints are calculated over the DER-encoded certificate bytes using the Web Crypto API, then formatted as colon-separated uppercase hex (e.g. AA:BB:CC:...). Useful for comparing certificates or pinning.