Your Mac already has a capable tool. You can open one audio file in QuickTime and drag other WAV files directly into the window to merge them. 2. Combine Audio Files (App Store)
Small file size (1.0 MB), focused specifically on joining. Best WAV Joiner Tools for macOS (2026)
WavePad is a professional-grade editor that offers a free version for non-commercial use. It includes a specific "Join" feature designed for joining multiple audio files end-to-end. Fast, intuitive, supports over 50 audio formats. 3. WAV Joiner 5.0.1
Audacity is arguably the best free audio editor available. It is fully cross-platform and handles WAV files exceptionally well.