Free online true peak meter
Upload a master and get its true peak in dBTP, measured with 4× polyphase oversampling per ITU-R BS.1770-4 Annex 2 — the inter-sample peaks that a normal sample peak meter misses and that clip audibly after MP3/AAC encoding. Aim for −1.0 to −0.1 dBTP for a clean streaming master.
What you get
- True peak in dBTP with 4× oversampling, not just sample peak.
- Flags inter-sample overs that distort after lossy codec encoding.
- Pairs with full LUFS / dynamics / tonal analysis if you want the whole picture.
- Free, no signup, runs in your browser.
Questions
What true peak should a master hit?
−1.0 to −0.1 dBTP is the clean target — enough headroom that lossy encoding won't push inter-sample peaks into clipping.
Why does true peak differ from sample peak?
Sample peak only reads the existing samples; true peak reconstructs the analog waveform between them, where the real maximum often sits higher.