Shift Audio Pitch Up or Down
Adjust tone in semitones while keeping the timing steady.
Upload audio to pitch-shift
MP3, MP4, WAV, M4A, AAC, or FLAC · up to 200 MB
Pitch shifting
Change Tone Without Retiming the Track
Control musical or vocal pitch independently from duration.
Choose audio
Add one supported recording.
Set the pitch
Shift up or down in semitone steps.
Process in VisionStory
Create and review the pitch-adjusted file.
Technical anatomy
Keep Duration Separate From Pitch
A pitch shifter can aim to preserve the source duration while moving tone, whereas changing playback speed naturally affects both duration and pitch.
Keep Duration Separate From Pitch
The live product must verify change audio pitch controls and output behavior before they are presented as facts.
Keep the change audio pitch contract honest
Confirm the live controls, accepted inputs, and output behavior before turning this change audio pitch explanation into a product promise.
Inspect semitone accuracy, duration, and formants directly
Verify semitone accuracy, duration, and formants from actual source and output properties.
Verification method
Test a Reference Tone and a Human Voice
Create real outputs from an authorized 440 Hz reference tone and a spoken-voice fixture at −12, 0, and +12 semitones if supported.Test a Reference Tone and a
The live product must verify change audio pitch controls and output behavior before they are presented as facts.
Keep the change audio pitch contract honest
Verified semitone range; duration behavior; reference-tone accuracy; voice artifacts; formant controls if any; output format and properties.
Publish exceptions with the method
Document failures and unsupported cases affecting semitone accuracy, duration, and formants.
Decision guide
Semitones Make the Shift Predictable
Zero semitones keeps the original pitch, +12 moves tones up one octave, and −12 moves them down one octave.
Semitones Make the Shift Predictable
Frequency doubles across an octave upward and halves across an octave downward in ideal equal-tempered pitch relationships.
Keep the change audio pitch contract honest
Shift an audio recording up or down by semitones while keeping its duration steady when supported. Owns global semitone/octave shifts with steady-duration intent.
Keep semitone accuracy, duration, and formants within scope
Keep semitone accuracy, duration, and formants as the central decision and route neighboring tasks elsewhere.
Tonal control
Explore a Full Octave in Either Direction
Use familiar semitone units for predictable changes.
One octave lower
Create a deeper tonal result.
Original pitch
Return to the source tone.
One octave higher
Create a brighter tonal result.
Frequently asked questions
A semitone is the smallest standard interval between adjacent notes in Western music.
