Online spectrum analyzer

Online Audio Spectrum Analyzer is a tool that runs in your web browser to inspect audio signals. You can upload a file or use your microphone for real-time analysis. It's built for anyone who needs to see the frequency content of their audio, from quick checks to detailed troubleshooting.

The tool provides two main views. The Spectrum view shows the frequencies present at a single moment. The Spectrogram adds a time dimension, letting you see how the audio's frequency content changes throughout a recording.

The free version provides several tools for visual inspection:

• Live measurements: Track peak frequency and see the five strongest frequencies in real time.
• Visual diagnostics: Check for issues like clipping, unwanted noise, and electrical hum.
• Local processing: Your audio is not uploaded. All analysis happens securely on your device.
• Free export: Save the current view as a PNG image or CSV data file.

For more demanding work, a Pro version offers complete-file diagnostics. It performs a full analysis to find and timestamp specific issues like clipping, broadband noise, and 50/60 Hz mains hum. It also provides standards-based loudness measurements, including Integrated LUFS, Loudness Range (LRA), and True Peak levels. Pro users can export detailed PDF reports and full data sets for documentation.

The site also includes free tools to generate test signals, such as fixed tones, frequency sweeps, and different types of noise.