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Online Public Key Validator

Validate public keys in RSA, DSA, ECDSA, and Ed25519 formats. Check PEM, DER, and SSH key formats with detailed analysis.

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About This Tool

This online public key validator tool allows you to verify the correctness of various public key formats including RSA, DSA, ECDSA, and Ed25519. Simply paste your public key in PEM, DER, or SSH format, select the key type (or let the tool auto-detect), and get instant validation results. The tool checks for proper encoding, extracts key parameters like modulus, exponent, curve name, and key size, and provides detailed feedback on any issues found. Perfect for developers, system administrators, and security professionals working with cryptographic keys.
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How to Use

  1. Paste your public key into the text area (supports PEM, DER Base64, or SSH formats)
  2. Select the key type from the dropdown (RSA, DSA, ECDSA, Ed
  3. or choose 'Auto-detect'
  4. Click the 'Validate Public Key' button
  5. View the validation results including key format, type, size, and extracted parameters
  6. If errors are found, review the detailed error messages to fix your key
How to use online public key validator

Frequently Asked Questions

Find Quick Answers

What public key formats does this tool support?
The tool supports PEM format (-----BEGIN PUBLIC KEY-----), DER format (Base64 encoded), and SSH public key format (ssh-rsa, ssh-dss, ecdsa-sha2-nistp256, etc.).
Which key types can I validate?
You can validate RSA, DSA, ECDSA (with common curves like P-256, P-384, P-521), and Ed25519 public keys. The tool also includes an auto-detect feature to identify the key type automatically.
Does this tool send my keys to a server?
No, all validation happens entirely in your browser using JavaScript. Your keys never leave your computer, ensuring complete privacy and security.
What information does the validator provide?
The tool provides key format, type, key size (in bits), and extracted parameters like RSA modulus/exponent, DSA parameters (p, q, g, y), ECDSA curve name, or Ed25519 public key bytes.

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