Inspect an audio file
See the spectrum of a recording: where a lossy codec cut the top off, where an edit was made, where the noise floor changes. The measurements are shown; the conclusions are yours.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Drop an audio file.
- Read the properties and tags.
- Explore the spectrogram — hover for the exact time and frequency.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see are the tool’s own code and, once cached, none at all.
Frequently asked questions
What can I learn from a spectrogram?
A hard black ceiling at 16 kHz means the file went through a low-bitrate lossy codec, even if it is now a WAV. Vertical stripes are clicks or splices. A sudden change in the noise floor part-way through often means two recordings were joined. A constant horizontal line is hum or a tone.
Why is there no synthetic-voice detector?
The same reason as on the image page: the permissively-licensed models are unvalidated fine-tunes with almost no usage, and the credible ones are hundreds of megabytes and non-commercial. On a question this consequential, a detector that is often wrong is worse than none.
Is my recording uploaded?
No. The browser decodes it with the Web Audio API and the spectrogram is computed here with an FFT written into the page. A confidential interview stays confidential.