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SnapOtter/apps/docs/tools/pitch-shift.md
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description
description
Raise or lower audio pitch by semitones without changing speed.

Pitch Shift

Raise or lower the pitch of an audio file by a number of semitones without changing its playback speed.

API Endpoint

POST /api/v1/tools/pitch-shift

Accepts multipart form data with an audio file and a JSON settings field.

Parameters

Parameter Type Required Default Description
semitones integer No 3 Semitones to shift (-12 to 12). Must be nonzero.

Example Request

curl -X POST http://localhost:1349/api/v1/tools/pitch-shift \
  -H "Authorization: Bearer si_your-api-key" \
  -F "file=@audio.mp3" \
  -F 'settings={"semitones": -5}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/audio.mp3",
  "originalSize": 4500000,
  "processedSize": 4500000
}

Notes

  • Positive values raise the pitch; negative values lower it.
  • A shift of 12 semitones equals one octave up; -12 equals one octave down.
  • Playback duration stays the same regardless of the shift amount.
  • Output format matches the input format.