Built for trusted documents
TrexoLab is a product and engineering studio focused on PDF signing and verification — SDKs, desktop apps, and platforms for teams that can't afford a broken signature.
We started TrexoLab to solve one problem well: signing and verifying PDF documents with real cryptographic rigor, without asking teams to trust a black box. Every product we ship — from a Rust/WASM verification engine to hardware-token desktop signing — is built to run as close to the document as possible, and to stay client-side wherever the workflow allows it.
PDF signing & verification, done right
A small, focused product family covering the full document-trust lifecycle — verify, sign, distribute, and license.
VerifyKit
PDF signature verification SDK -- Rust/WASM engine, React viewer components, and a zero-config vanilla JS drop-in.
Mudrit
Pure-Rust PDF digital-signing SDK with PAdES, LTV, and RFC-3161 timestamping -- no OpenSSL, no Python.
Authvon
Self-host, enterprise-grade license server -- issue, activate, and manage software licenses under your own brand.
TrexoLab PDF Signer
Cross-platform desktop PDF signing app -- hardware DSC tokens, PFX/PKCS#12 certificates, and RFC 3161 timestamping.
Bulk PDF Signer
High-volume batch PDF signing for enterprise workflows -- thousands of documents in a single operation.
Engineered for correctness
Real cryptography and real standards — PAdES B-B/B-T/B-LT/B-LTA, RFC 3161 timestamping, PKCS#12/PKCS#11 key sources, and an embedded AATL trust store — not marketing labels.
What we optimize for
Security first
Advanced encryption and cryptographic rigor built to global compliance standards, not bolted on after the fact.
Client-side by design
Wherever possible, documents never leave the browser or device. Privacy is a default, not a setting.
Cross-platform reach
Web, desktop, and headless server — the same signing and verification guarantees everywhere your team works.
Quality without shortcuts
Every feature is engineered to a standard we'd trust with our own contracts, invoices, and compliance filings.