QubTag is a high-performance, customizable time-tagging module designed for demanding quantum optics and quantum information applications. It delivers picosecond-level timing resolution with flexible channel configurations, enabling precise timestamping of photon detection events and electronic pulses. QubTag is available in versions optimized for both terrestrial laboratory use and space-qualified applications, addressing the needs of ground-based quantum systems as well as space-based quantum communication and sensing missions. With support for high single and coincidence count rates, a compact form factor, and configurable interfaces, QubTag is well suited for quantum communication, photon correlation measurements, coincidence counting, and advanced quantum experiments in research and deployment environments.