Generate Ed25519 key pairs for high-performance digital signatures and SSH authentication.
An Ed25519 key pair consists of a secret signing key and a public verification key. This generator creates both in the browser, so the private material is not uploaded. The public half can be distributed, while the private half must remain confidential. Ed25519 keys authenticate signatures; they do not encrypt messages or files. A common surprise is that exported keys can be longer than Ed25519's raw 32-byte values because SSH, PEM, or other containers add format information.
Ed25519 begins with a 32-byte secret input. SHA-512 expands that value, specified bits are adjusted, and the resulting scalar is multiplied by the curve's standard base point. The encoded point is the 32-byte public key. This derivation is one-way in practical use: publishing the public key does not disclose the secret input.
Each generation creates a new secret value and derives its matching public key. There is no fixed output that can be truthfully shown for a pasted input, which is why this profile has no worked example. Repeating generation should produce a different pair. Save the private result before leaving the page if the generated identity must remain usable.
No, not from the public key or by pressing generate again. Normal key generation is randomized, and the public key does not contain enough information to reconstruct the private key. Retain a protected copy of the private output if the identity matters. If it is lost, generate a replacement pair and update every system that trusted the old public key.
Yes only when it is presented as an OpenSSH public-key record. Such a record uses the key type ssh-ed25519, followed by the encoded key data and optionally a comment. A raw, hexadecimal, PEM, or differently wrapped public key cannot simply be pasted into authorized_keys. The private half must never be placed in that file.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
Generate strong, random passwords with customizable length, character sets, and complexity requirements.
Analyze password strength with entropy scoring, crack-time estimates, and improvement suggestions.
Create cryptographically random strings for API keys, tokens, salts, and unique identifiers.
Create QR codes for URLs, text, Wi-Fi credentials, vCards, and more with customizable size and colors.
Scan and decode QR codes from uploaded images or your device camera to extract embedded data.
Compute MD5, SHA-1, SHA-256, and SHA-512 checksums to verify file integrity and detect tampering.