Ed25519 Signature Sign & Verify
Sign & verify with Ed25519 — modern, fast, and secure signatures. This tool does both sign and verify on one page — pick a mode, paste your data, and click. Everything runs on your device, nothing is sent to a server.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
I agree to the terms.
Example Output
c1d…(Base64 signature)
How to Use
- 1Choose Sign or Verify mode at the top.
- 2Fill the Input field and, if required, complete the fields in "More settings" (key/password).
- 3Click the button (or press Ctrl+Enter) to process.
- 4Copy the result with the Copy button.
About Ed25519 Signature
Ed25519 is a signature scheme based on the Edwards curve (Curve25519), designed to be fast, secure, and resistant to implementation mistakes. Its signatures are just 64 bytes.
It is the modern de facto standard: used in SSH, Signal, TLS, Linux packages, and many security systems. It is deterministic (needs no RNG when signing), making it more robust against bugs.
This tool uses Ed25519 via Web Crypto. Sign with a PEM private key; verify with a PEM public key + Base64 signature. Create keys in the Ed25519 Key Generator.
FAQ
Are my data or keys sent to a server?
No. Ed25519 Signature runs entirely in your browser using the Web Crypto API and client-side libraries. Your data, passwords, and keys never leave your device.