Trusted QSL

The program provides a graphical interface for amateur radio operators to digitally sign and upload their QSO (contact) records to the ARRL’s Logbook of the World (LoTW) service. It handles the creation of cryptographically signed QSL files, validates them against LoTW requirements, and transmits the records to the online logbook, allowing users to confirm contacts and earn awards without paper QSL cards. The software runs on macOS (64‑bit Intel and Apple Silicon) and is distributed as a stable release, with equivalent versions available for Windows and Linux.

It is intended for licensed ham operators who maintain electronic logs and need to submit them to LoTW for verification. By automating the signing and upload steps, it reduces manual handling of QSL paperwork and integrates directly with the ARRL’s online logging system.

What distinguishes the tool is its compatibility with all currently supported macOS releases, its support for both modern and legacy processor architectures, and its adherence to the ARRL’s official QSL signing standards, ensuring that submitted records are accepted by LoTW without additional conversion.