What does Audio Pitch Changer do?
Raise or lower the pitch of an audio file in your browser without uploading it. Choose a shift from -12 to +12 semitones, fine-tune by cents and preview an MP3, WAV or M4A export. One semitone is one step of the 12-note octave; 100 cents make one semitone. Preserve-duration mode aims to keep the recording's length, while natural mode changes playback speed and duration along with pitch.
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.
Choose a pitch shift without confusing it with speed
A positive semitone value raises pitch; a negative value lowers it. Cents provide finer adjustment, such as tuning a sample that is slightly sharp or flat. The frequency ratio follows 2 raised to the total semitone shift divided by 12, so a 12-semitone shift doubles or halves frequency.
Preserve duration when a vocal or instrument must stay aligned with a video or backing track. Natural pitch plus speed is closer to changing tape or playback rate: the pitch and length change together. Larger shifts in preserve-duration mode can produce audible time-stretch artifacts, so preview the result before export.
Frequently asked questions
What is a semitone in audio pitch?
A semitone is one of 12 equal pitch steps in an octave. Each semitone is 100 cents, so cents let you make smaller adjustments.
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.