Digital signature software · 20+ years
Digital Signature Software and .NET Signature Library
For more than 20 years we have developed professional software for digital signatures and digital certificates. Our products let organizations sign and seal documents in compliance with international standards, installed on premise, with lifetime licenses and no per-signature or subscription fees.
For users
PDF Signer
Sign a single file or bulk-sign thousands at once by selecting an input and output directory, ideal for high-volume corporate PDF signing.
- Bulk signing of entire folders of PDF documents
- Smart cards, USB tokens and eIDAS qualified certificates (QSCD)
- Embedded RFC 3161 timestamping, PAdES-LTV with long-term validation
- Configurable signature appearance and document certification
For developers · eIDAS compliant
.NET Digital Signature Library
Create and verify PAdES, CAdES and XAdES signatures and ASiC-E containers from C#, VB.NET, ASP.NET and PowerShell, with any X.509 certificate worldwide, including eIDAS qualified certificates and seals, timestamps and long-term validation.
- PAdES, CAdES, XAdES, ASiC-E with baseline levels up to LTA
- eIDAS qualified signatures and seals on QSCD, smart cards and HSM (PKCS#11)
- Visual Studio sample projects, free evaluation with all features
More signature software for Windows
Beyond PDF, tools for X.509 certificate-based digital signatures across multiple document types, all with bulk signing for high-volume workflows.
ASiC-E · XAdES
ASiC Signer
Sign files of any type (PDF, Word, images, XML, archives) in ASiC-E containers with eIDAS XAdES signatures.
Timestamping
We provide eIDAS Qualified Timestamps issued by a Qualified Trust Service Provider (QTSP) listed in the European Union Trusted Lists (EUTL) under the eIDAS Regulation. If you need eIDAS Qualified Timestamps with full legal effect across the EU, visit our dedicated website (https://qtsa.eu).
To run your own RFC 3161 Time Stamping Authority on a Windows server, see tsaserver.com.
For developers
Code samples in C# and PowerShell show how to sign and verify PDF, CAdES and XML files, add timestamps, sign in bulk and use certificates from Azure Key Vault.