About XSigi
Last updated: October 27, 2025
XSigi helps individuals and teams create, verify, and preserve trusted digital evidence for documents and files. We focus on cryptographic integrity, simple user experience, and privacy-by-design.
What We Do
- PDF Digital Signatures: Create verifiable signatures with auditability and long-term verification.
- ZIP Encryption: Protect file bundles using modern authenticated encryption (ChaCha20-Poly1305) and public keys.
- Invisible Watermarks: Embed DCT-based watermarks for ownership proof without altering visual quality.
- Text Encryption: Use the XSigi Envelope v1 (Ed25519 + X25519 + Armored JSON) for portable, verifiable messages.
Why Choose XSigi
- Security First: Modern cryptography, rate-limiting, and best-practice safeguards.
- Simple & Fast: A clean interface that helps you get work done quickly.
- Transparent: Clear audit trails and verifiable records when you need them.
- Privacy-by-Design: We minimize data and avoid long-term storage of your documents.
Get Started
Ready to try XSigi? Create an account or explore pricing.
See also our Privacy Policy & Data Retention & T&C.
Questions? Visit the Contact section on the home page.