A spectrogram plots time from left to right and pitch from bottom to top, with brightness for loudness. A flute is a few thin lines. A snare hit is a tall smear. An MP3 that was upconverted from a low bitrate has a flat ceiling where the highs were cut off.
That last use is the common one: checking whether a file sold as lossless really is. A real CD rip reaches 22 kHz. A 128 kbps MP3 stops near 16 kHz, whatever the file extension says.
How to use the Spectrogram Generator tool
- Add your audio file.
- Choose the size, colors and frequency axis.
- Draw the spectrogram and save the PNG.
Popular uses
- Checking whether a FLAC or 320 kbps file is real
- Finding the pitch of a hum or a whistle
- Studying bird song, speech or instruments
Tips for the best result
- The linear axis shows cut-off highs best. The logarithmic axis shows musical notes best.
- Leave the axes on to read frequencies off the side.
Quick facts
| Price | Free |
|---|---|
| Works with | MP3, WAV, FLAC → PNG |
| Where it runs | In your browser, on your device |
| Account | Not needed |