FREE TOOLS

Audio Pitch and Tempo

Change tempo while preserving pitch, or shift pitch while retaining duration.

WAV, MP3, M4A, AAC, OGG, Opus, FLAC, WebM, MP4

WAV

Browser only

Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.

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How to use this tool

Choose a supported local audio file.
Set tempo from 0.5 to 2 times speed and pitch from minus 12 to plus 12 semitones.
Choose Change pitch and tempo. The first run downloads and verifies the engine; Cancel terminates its worker.
Review duration and clipping information, then download the WAV. Reset clears selected input and output.

Slow a practice recording to 0.75 times speed while keeping its original pitch.

Input up to 64 MiB; mono/stereo, 8 to 96 kHz, 0.25 seconds to 5 minutes. Input and output each at most 32 million decoded samples; output duration at most 5 minutes and WAV at most 64 MiB.
Processing has a 180-second deadline and 512 MiB native memory cap. Decoded buffers also consume browser memory. Browser audio-decoder support is required.
Output is 48 kHz, 16-bit PCM WAV. Original tags are omitted. Pitch and tempo processing is approximate and can introduce artifacts, especially with large shifts, complex music or transients.
Formants are not separately corrected; this is not auto-tune or musical key detection. Peak protection only reduces global gain when needed and is not loudness or true-peak normalization.
Tempo changes the expected duration; pitch shifts retain it. Leading and trailing silence stays part of the timeline, with possible spectral smearing around transitions.
When audio is decoded, tracks with more than one second of decoder priming or overlapping sample timestamps are unsupported. The 32-million decoded-sample work cap includes priming and skipped samples.

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