RSA key generator

Generate an RSA-OAEP key pair and export public and private PEM files together.

On your device · No account

Privacy details

RSA key generator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

RSA modulus length

Your result

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-19

Using RSA key generator

RSA key generator uses Web Crypto, then checks the key pair with a local encryption and decryption round trip. Both PEM blocks are provided without a server, account or persistent key store.

Next: HMAC generator

A worked example

The 2048-bit setting produces one matching public SPKI key and private PKCS8 key. Each generation creates a new pair.

Before you use the result

The private key is exported unencrypted. Use dedicated key-management tooling for production secrets. The browser’s RSA-OAEP SHA-256 operation verifies the pair; use compatible padding and hashing in the consuming system.

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ToolOctopus. “RSA key generator.” Updated 2026-09-19. https://tooloctopus.com/rsa-key-generator.

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