SInES Tools: Formant Shifter
(Change voices and instruments sounds by shifting and reshaping their spectral envelope)

 

1. Upload Audio File
2. Process
Formant Shift Factor: 1.0

(0.5 = Deep/Giant, 1.0 = Normal, 2.0 = High/Chipmunk)
Formant Contrast (Gap Filling): 1.0

(0.0 = Gaps Filled/Smooth Hill, 1.0 = Normal, 2.0+ = Sharpened Peaks)
Spectral Tilt (Brightness): 0.0

(-2.0 = Dark/Mellow, 0.0 = Normal, 2.0 = Bright/Thin)
3. Play & Save
Please upload an audio file.
 Analysis Parameters: Window Size: 4096 Samples (spec. envelope: 40 Bins, Hull Filter: 180 Bins) | Hop Size: 1024 Samples
| FFT Size: 4096 | Sample Rate: dependent on audio file
Formant Shifter © 2026 by Christoph Reuter and SInES (last modified: 13.9.2026) is released under MIT License
Translation of the Chinese version of the website: Li Hao
How to cite: Reuter, C. (2025). SInES Tools: Formant Shifter. Web Application https://sinestools.univie.ac.at/formant_shifter.htm