BISS (Browser Independent Signing Service) is software for signing with Qualified Electronic Signature (QES) when performing operations in the Internet browser. It uses technology that allows local electronic signature without using an active component. A major advantage of using BISS is its independence from the browser used and its restrictions or inability to support Java applets or ActiveX controls. BISS provides QES certificates for all popular browsers under operating systems MS Windows 8, MS Windows 10, Linux Ubuntu 18.04 LTS/20.04 LTS and macOS Catalina. It works with each use of the private key of the QES certificate located on the smart card. BISS uses Microsoft CryptoAPI or PKCS11 library to access the smart card. To use BISS, it is necessary to pre-install the service as an application on the workstation where the signing will be done - administrator rights are required.
BISS is proprietary software from B-Trust. Check the publisher's license terms for pricing and usage rights.
What is the latest version of BISS?
The latest version is 3.46, released on Aug 28, 2025.
Is it safe to download BISS?
The download button links to the official installer published on b-trust.bg, the same file Windows Package Manager installs. You can verify the downloaded file by comparing its SHA-256 checksum with 8f0daad0100e819b43d473e62f7c5ffafe1bd26cbf7b1a7f1a15b2af133d0577.
Which Windows versions does BISS support?
BISS runs on Windows and is available for 32-bit (x86) systems.
How do I install BISS silently?
Run the offline installer with msiexec /i "BISS.msi" /quiet /norestart, or install it with Windows Package Manager: winget install --id=B-trust.BISS -e --silent.
How do I uninstall BISS?
Open Settings › Apps › Installed apps, find BISS and select Uninstall. From the command line, run winget uninstall --id=B-trust.BISS -e.
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