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Security
PEM X.509 Certificate Inspector
Paste a PEM-encoded x509 certificate and view Subject, Issuer, validity, SANs, key usage, extensions and SHA-1/256 fingerprints. All client-side.
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Apply classic ciphers (Caesar, ROT13, Atbash) or Base64. Useful for puzzles, CTFs and testing — do not use for real security.
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Password Strength Checker
Check the strength of a password with entropy calculation, common-password check and improvement tips. Runs in your browser — no data is sent.