What does Audio Pitch Changer do?
Tubelexity is a free audio pitch changer for shifting a local recording from -12 to +12 semitones, with fine cents adjustment and an exact frequency-ratio display. Preserve-duration mode time-stretches the result back toward the original length, while natural mode changes pitch and playback speed together. Preview and export MP3, WAV or M4A without uploading the source.
How to use Audio Pitch Changer
- 1Choose an MP3, WAV, M4A, OGG or WebM audio file.
- 2Set a semitone preset or slider value, then optionally fine-tune cents.
- 3Choose Preserve duration or Natural pitch + speed and review the calculated ratio and duration.
- 4Choose bitrate, sample rate, channels and filename, then process, preview and download.
Supported inputs and outputs
Inputs
MP3, WAV, M4A/AAC, OGG/Vorbis, WebM/Opus
Outputs
MP3, PCM WAV, AAC in M4A
Practical uses
- Transposing a practice track
- Matching a vocal range
- Creating a tape-speed effect
- Fine-tuning a sample by cents
Browser and media limitations
- Preserve-duration shifting uses FFmpeg filters and can create artifacts at large shifts.
- Natural mode changes duration as well as pitch.
- All exports are re-encoded and are not lossless.
- Long or high-resolution audio can exceed browser memory.
- M4A support depends on the FFmpeg AAC encoder included in the browser build.
How local processing works
Audio processing runs in this browser with lazy-loaded FFmpeg.wasm. The source and output are not uploaded to Tubelexity or a processing server.
Frequently asked questions
How is the pitch ratio calculated?
The frequency ratio is 2 raised to semitones divided by 12, with cents included as one hundredth of a semitone.
Can I change pitch without changing duration?
Yes. Preserve-duration mode counteracts the natural speed change with a tempo filter, although the result is approximate.
What does Natural pitch + speed do?
It changes sample playback rate, so higher pitch is faster and lower pitch is slower.
Is the export lossless?
No. MP3 and M4A are lossy encodes, and even WAV contains processed samples.
Does Tubelexity upload my audio?
No. The file stays in your browser tab.