Ed25519 Sign + Verify (Message Authentication)

Ed25519 is the modern default for digital signatures — used by OpenSSH, GitHub, signing for git commits, Tor onion v3 addresses, age encryption. This tool generates Ed25519 keypairs, signs messages with the private key, and verifies signatures with the public key. All browser-side.

How to use the Ed25519 Sign + Verify (Message Authentication)

Click Generate new keypair to get a fresh Ed25519 keypair. Type a message, click Sign to produce a signature. Anyone with the public key can use Verify to confirm the signature.