Mark
Open your Mark desk
Enter your email and we will send you a one-time sign-in link. No password. Your first stamp is free. No plan or card required.
Get an instant key for stamping from code or an agent. Its first stamp is free; sign in with email later to attach it to your account.
Mark
Your account
Plan & usage
Buy more stampsLoading…
Stamp a file
Private by defaultYour file stays on this device. Only its fingerprint is sent.
API keys
Use a key as authorization: Bearer pk_... from code, an agent, or
another app. The secret is shown once.
Your stamps
Every proof you have created, newest first.
- Loading…
Prove it's you
Put your name on your stamps. Prove you control a domain or account (free, one time) and every stamp you make shows it as a verified publisher. Viewers see "whitehouse.gov ✓" instead of an anonymous account, and you get a public page listing everything you've stamped. Without this, your stamps still work: they just read as "just an account."