eMark – Free & Open Source PDF Digital Signature Software Securely sign, timestamp, and protect PDF documents with USB tokens, HSM (PKCS#11), and PFX/PKCS#12 certificates. Cross-platform (Windows, Linux, macOS) with a modern dark-themed UI and enterprise-grade features like timestamping, LTV validation, and password-protected PDFs.
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Updated
Sep 14, 2025 - Java