Ed25519 Sign/Verify

Online Ed25519 sign and verify tool with key generation, public key derivation, message signing, and signature validation for API security, identity authentication, and protocol debugging.

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Key Generation

Generate a new Ed25519 key pair with multiple output formats.

Output Format

Ed25519 spec: private key 32 bytes, public key 32 bytes, signature 64 bytes

Private Key (32 bytes / 256 bits)

Public Key (32 bytes / 256 bits)

Derive Public Key from Private Key

Input an existing private key to derive its public key.

Private Key (32 bytes / 256 bits)

Public Key (32 bytes / 256 bits)

Format

Documentation

This tool provides Ed25519 key generation, message signing, and signature verification with local browser-side processing.

Key Features

Generate Ed25519 key pairs
Derive public key from private key
Sign messages and verify signatures
Support Text/Hex/Base64/Spaced Hex/C-array formats

Steps

Generate or input keys in the Generate tab.
Sign a message with private key in the Sign tab.
Verify with public key, message, and signature in the Verify tab.

Use Cases

API request signing
Data integrity verification
High-performance modern signature demos

Notes

Keep private keys strictly confidential.
Message content and encoding must match exactly during verification.
Ed25519 is for signatures, not encryption.