Ed25519 Key Generator — Sign & Verify
Free online Ed25519 key pair generator with message signing and signature verification. Uses the Web Crypto API. No sign-up, runs in your browser.
AI developer workflow fit
Use Ed25519 Key Generator — Sign & Verify while building with AI coding assistants, agents, and LLM workflows: validate generated output, transform payloads, debug integrations, and prepare reliable inputs without leaving your browser.
What Is Ed25519?
Ed25519 is a modern elliptic-curve digital signature algorithm that provides high security with short keys and fast performance. It is based on the Edwards-curve Digital Signature Algorithm (EdDSA) using Curve25519. Ed25519 is used in SSH, TLS, cryptocurrency wallets, and many authentication protocols. A 32-byte public key and 64-byte signature provide 128-bit security.
How to Use This Ed25519 Key Generator
- Click Generate Ed25519 Key Pair to create a new public/private key pair.
- Copy the public key (SPKI PEM) or the raw Base64 format for use in your application.
- Keep the private key (PKCS8 PEM) secure — never share it.
- Use the Sign section to sign messages with the generated private key.
- Use the Verify section to check a signature against the public key.
Common Use Cases
- SSH Key Generation — Generate Ed25519 keys for SSH authentication, the recommended algorithm for modern OpenSSH.
- Digital Signature Testing — Test signing and verification workflows for APIs, JWTs, or blockchain applications.
- Learning Cryptography — Understand how public-key cryptography works by experimenting with key generation, signing, and verification.