Developer builds browser-based spectrum analyzer that keeps audio fully local

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A developer has launched a free browser-based spectrum analyzer at onlinespectrumanalyzer.com, designed to analyze audio files without uploading them to any server. The tool uses the browser's built-in Web Audio API to decode and process audio entirely on the client side, ensuring user privacy. It offers both a real-time frequency spectrum view and a spectrogram that visualizes how frequencies change over time. The developer focused on making FFT output readable to non-specialists, such as helping users spot 50/60 Hz hum without requiring DSP knowledge. The project is still being improved, with a focus on practical audio debugging use cases like noise, clipping, and unwanted resonances.

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