Pass a password, SSH key, or API token to exactly one person. Your secret is encrypted in your browser before anything leaves it, transferred directly browser-to-browser when both people are online, and destroyed after a single read. No account required.
Prefer the terminal? The same protocol is available as a CLI: npx shareasecret — see the CLI guide.
npx shareasecret
Guides:
Secret Share requires JavaScript for the encryption to run in your browser.