Step 1
Upload & describe
Drop your PDF into ProofSign and add a friendly name for downstream audit records.
Start sealing›Sign with confidence. Seal with proof.
Digitally sign & seal PDFs in minutes
Upload a PDF once, invite your signers, and send back a sealed, shareable file everyone trusts.
Product tour
The final step to digitally sign your documents.
ProofSign is built for the moment your PDF is ready to sign. You can seal it, sign it, and prove it hasn't been altered with an audit trail that's verifiable at any time.
Three simple steps from upload to a cryptographically sealed PDF.
Proof layer
Security comes standard with every workflow.
Cryptographic evidence, immutable manifests, and public verification are built into ProofSign, not bolt-ons.
Security & compliance
Built with enterprise-grade safeguards
ProofSign is architected with a zero-trust mindset. Every action is authenticated, logged, and backed by cryptographic proofs that you can independently verify.
- ✓Data stored in AWS (eu-west-2) with server-side encryption and scoped IAM roles.
- ✓Transactional email flows are rate limited and signed via AWS SES.
- ✓Manifests retain signer hashes, timestamps, and device metadata for audits.
- ✓Public verification endpoint enables self-service trust without vendor lock-in.
Audit-ready logs
Every action is timestamped and associated with a verified signer hash.
Immutable seals
PDFs are stamped with tamper-evident manifests and final SHA-256 fingerprints.
Access controls
Least-privilege IAM policies and continuous monitoring keep your documents safe.
Open verification
Third parties can independently validate ProofSign documents without custom tooling.