What does a spectrogram tell you?
A spectrogram plots frequency over time. A waveform only shows loud vs quiet; a spectrogram shows which frequencies are present, missing, or cut.
The Phổ âm thanh tool on TáchNhạc is live: drop an MP3, WAV, FLAC, M4A or OGG, run entirely in the browser, free, file never leaves the device.
How to spot a fake lossless file
A FLAC or WAV wrapper can still hold a low-bitrate MP3. On the spectrogram, a sudden flat cutoff around 16-19kHz is the usual brickwall of a lossy source. Real lossless usually rolls off more gradually. A cutoff is a clue, not proof; some original masters also slope in the highs.
Noise removal is still being built
Khử tiếng ồn on TáchNhạc is still Coming soon. The page explains which noises the model should handle well, but it does not accept files yet and has not published limits or pricing.
How to read a spectrogram today
- Open tachnhac.com/spectrogram/.
- Drop an audio file. It stays on your machine.
- Look at the top edge: a hard flat line near 16-19kHz often means a lossy original.
- Zoom a loud chorus if you need to check clipping, hum, or leftover vocals on a separated beat.