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Upload Document
Drop a PDF here or click to browse
Place Fields
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Drag onto document
Fields
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Add Signers
Other Signers
Signing order is shown by number. Signers will be notified in order — each must complete before the next is invited.
Verify a Signature
Drop a signed PDF from SignedIn.ink to verify all signatures and cryptographic proofs.
Drop signed PDF here
Transparency Log
Every signature is recorded in a tamper-evident Merkle tree.
| # | Signer | Document Hash | Signed At |
|---|
Activity Log
All actions related to your account — uploads, emails, signatures, verifications.
| Time | Action | Detail | IP |
|---|
How It Works
1. Upload
Upload any document — PDF, Word, image, or any file. It stays on our server only until all parties have signed.
2. Add Signers
Enter the email addresses of people who need to sign. Each receives a unique, secure signing link.
3. Sign
Each signer draws or types their signature, then a cryptographic keypair is generated in their browser. The document is hashed with SHA-256 and signed with Ed25519.
4. Timestamp
An RFC 3161 timestamp is obtained from a trusted authority, proving exactly when the signature was created.
5. Transparency Log
The event is recorded in a Merkle tree — an append-only, tamper-evident log that anyone can audit.
6. Verify
Anyone with the document and proof file can verify all 5 checks independently. No account needed.