SpeakerEject

SpeakerEject is a free collection of browser-based tools for checking phone speakers, headphones and audio playback. It includes a water-eject tone, left/right channel tests, a tone generator, surround-sound test files and practical troubleshooting guides.
The tools generate or play audio on your device without requiring an app installation or microphone access. Use them to compare what you hear and narrow down a playback problem.
Water-eject tones may help move droplets near a speaker grille, but they do not repair hardware damage or make a wet device safe to charge. The guides explain these limitations and when to seek manufacturer support.