Check if a song's C5 is really 528 Hz
Upload a track and this page measures where its C5 actually falls — in hertz and in cents from 528 Hz. Measurement only: nothing is altered, and nothing leaves your browser.
Measure your file
Check your own track's C5
Upload one song and this box measures where its C5 actually falls, to two decimal places — so you can confirm a 444 Hz track really lands on 528 Hz, or just see where C5 sits in an original or 432 Hz mix. Nothing is converted, nothing is downloaded, and the file never leaves your device.
Accepts MP3, WAV, AAC, M4A and FLAC. One file at a time.
1. Upload audio
Drop one or more .mp3, .wav, .aac, .m4a or .flac files here, or click to browse.Tap to choose .mp3, .wav, .aac, .m4a or .flac files — pick several for batch mode.
Preparing the uploader…
Where C5 lands at each tuning
528 Hz is a single note — C5 — not a tuning reference for a whole song. Where it falls depends on the recording's A4, because C is three semitones above A: C5 = A4 × 2^(3/12).
| Tuning reference (A4) | Resulting C5 | Distance from 528 Hz |
|---|---|---|
| 432.000 Hz | 513.74 Hz | −47.2 cents |
| 440.000 Hz | 523.25 Hz | −15.6 cents |
| 444.000 Hz | 528.01 Hz | +0.02 cents |
If your file measures off 528 Hz and you want it on that grid, the 444 Hz converter retunes the whole recording so A4 = 444.000 Hz, which puts C5 on 528.006 Hz.
Frequently asked questions
- How do I check if a song is really 528 Hz?
- Upload the file here. The checker measures the recording's tuning and reports where C5 actually lands, in hertz and in cents away from 528 Hz. Nothing is changed or downloaded — it only measures.
- Why does the checker talk about A4?
- A4 is the reference every tuner and DAW reports. C is three semitones above A, so C5 = A4 × 2^(3/12). A track sitting on A4 = 444.000 Hz puts C5 at 528.006 Hz; A4 = 440 Hz puts it at 523.25 Hz.
- How close counts as 528 Hz?
- Within about a cent is indistinguishable by ear. The checker reports the exact figure so you can judge for yourself instead of trusting a track's label.
- Are '528 Hz' uploads on YouTube and Spotify actually 528 Hz?
- Often not. Many are pitch-shifted by a rough amount, or simply relabelled. Measuring the file is the only way to know, which is what this page is for.
- Is my audio uploaded anywhere?
- No. The measurement runs entirely inside your browser; the file never leaves your device and no account is needed.