TQSL

Trusted QSL (TQSL) is a cross‑platform software tool used by amateur radio operators to prepare, sign, and submit QSO data to the Logbook of The World (LoTW) system. It also serves as a certificate management utility that creates and handles the digital certificates LoTW uses to authenticate submissions.

TQSL runs on Windows, macOS, and Linux. It supports common log formats such as ADIF and can import logs from many popular amateur radio logging programs. The software provides features for entering and managing station details (callsign, locator, operator, address) and supports handling multiple stations and callsigns. It includes a certificate manager to create, import, and install the cryptographic certificates used to sign QSO records.

Usability and workflow: after installing TQSL, a user obtains a LoTW certificate and imports it into the program. The user associates the certificate with their callsign and station configuration, imports or builds a log, selects the QSO records to submit, signs them with the private key, and uploads the signed data to LoTW. LoTW validates submissions against its database and returns verification results that can be viewed in TQSL.

Purpose and scope: TQSL is specifically designed for interacting with LoTW and is not intended for producing traditional paper QSL cards. It provides a secure workflow for issuing verifiable digital QSL confirmations and helps operators manage their LoTW participation, certificates, and submissions. The project is maintained to align with LoTW policies and log standards and is widely used within the amateur radio community.