Generate Ed25519 signing key pairs.
Ed25519 Key Generator keeps its state in memory and nowhere else. That is why it forgets everything on reload, and why it cannot leak anything.
The tool is a few kilobytes of JavaScript, not a service. That is why it can promise your data stays put and actually mean it.
You will find it under Keys & certificates, alongside 7 other tools for the same sort of job.
Outputs 32-byte private and public keys in hex or Base64 format.
hex
=== Ed25519 Private Key (Seed) === 1617e12349117c33c49c172716bd01b0f36228ef11f4e52c7ab09fbbb527b7d7 === Ed25519 Public Key === 604239321c491cb9286595a43b452d9add048a72109f91f5a7653fa71b05c715 Format: hex Private key: 32 bytes (256 bits) Public key: 32 bytes (256 bits)
Yes. It is JavaScript running in this tab, so once the page has loaded it needs nothing further from the network. Put the machine in flight mode and it carries on. Nothing you do here is sent anywhere, because there is nowhere for it to go.
No. Reload the page and it starts from nothing. There is no account, no saved state and no cookie holding your last session. That is a deliberate trade: it cannot lose your data because it never keeps any.
Timing comes from performance.now(), the high resolution clock the browser provides, rather than from setInterval, which drifts by a few milliseconds every tick and compounds over minutes. What can still shift things is the browser throttling a tab in the background, so leave it visible if the timing matters.
Where a sound makes sense, it is generated with the Web Audio API rather than loaded as a file, so there is nothing to download and nothing to block. Browsers refuse to start audio until you have interacted with the page, which is why the first press is what switches it on.
Yes. The controls are sized for touch and the layout collapses to one column on a narrow screen. Bear in mind that a phone locking its screen will suspend the page, and timing stops with it.