Document signing with proof that holds up.
ProofVault signs PDFs directly in your browser, appends an immutable verification footer, and hash-locks the result into an encrypted vault with a complete cryptographic audit trail.
In-house signing engine
Draw with mouse, finger or stylus on an HTML5 canvas, or type a stylised signature. No third-party signing APIs involved.
Verification metadata
Every submission captures signer name, email, precise UTC timestamp, IP address and device user-agent.
Encrypted vault
Originals and signed copies live in a private, encrypted vault that only you can read.
Cryptographic audit trail
Uploaded → Viewed → Signed → Hash-Locked. Copyable SHA-256 values for legal chain-of-custody.
Every signature, provably yours.
SHA-256 of the original file plus the signature payload creates a record that breaks the moment anything changes.
Start signing freeTransparent Features & Limits
Start for free with basic features, or upgrade for unlimited signing, QR verification, and multi-party workflows.
Free Forever
Essential features for light or casual document signing.
- Limit: Up to 3 documents / month
- In-house interactive canvas signatures
- Basic tags (Signature & Date only)
On-Document QR Code VerificationMulti-Party Sequential Signing
ProofVault Solo
Unlocks unlimited documents and full verification tools.
- UNLIMITED documents & storage
- On-Document QR Code Verification
- Full Dynamic Tagging: Custom fields, checkboxes, text inputs
Multi-Party Sequential Order Routing
Business Team
Full suite for complex, multi-signer corporate workflows.
- Sequential Multi-Party Routing: Set Signer A → Signer B order
- Multi-role permissions (Signer, Approver, CC)
- Shared team workspace & reusable templates
- Priority email support