No upload · No software · Runs in your browser
Pitch Changer
Shift the pitch of any audio file up or down by semitones — without changing the playback speed. Drop in an MP3, WAV, M4A, FLAC, OGG, or any common audio format, choose your semitone shift from −12 to +12, and download the result as MP3. Processing runs entirely in your browser using FFmpeg WebAssembly. Your audio never leaves your device.
Drop your audio file here or click to browse
Any audio format · Max 20 MB
How it works
- 1Drop your audio file into the dropzone — MP3, WAV, M4A, FLAC, OGG, AAC, AIFF, and more are accepted.
- 2Choose a semitone shift: negative values pitch down, positive values pitch up. ±12 is one full octave.
- 3Click 'Change Pitch' — FFmpeg shifts the pitch using the asetrate filter locally in your browser.
- 4Preview the output in the audio player to confirm the pitch sounds right.
- 5Download the pitch-shifted MP3.
Use cases
Transpose music to match your vocal range
If a song is in the wrong key for your voice, shift it up or down by a few semitones to find a comfortable range. A +2 semitone shift changes the key from C to D without affecting the tempo.
Create karaoke tracks in a different key
Karaoke backing tracks are often fixed in a specific key. Pitch-shift the track to match the range of the singer — drop it 3 semitones for a lower baritone key or raise it 2 for a higher soprano range.
Music production: create harmonies and layers
Pitch-shift a recorded vocal or instrument layer by +3 or +7 semitones (a minor or major third above) to create a harmony track, then layer it with the original in your DAW.
Tune instrument samples to a target key
Sample libraries often include a single recorded note. Pitch-shift it to the required semitone for a specific key — useful when building custom sample packs or creating instrument patches.
Cover songs: match the original key
When recording a cover and the original was recorded in an unusual key (E♭, B♭), shift a reference track or your backing track so you can practice and perform in the original key.
Sound design: voice and effect modification
Pitch-shifting a voice recording down 6–12 semitones creates a deep, synthetic voice effect. Shifting sound effects up or down changes their character dramatically — useful for game audio and film sound design.
How pitch shifting works (without changing speed)
Pitch and speed are naturally linked in audio: a record spinning faster plays at a higher pitch with shorter duration. Separating the two requires signal processing.
This tool uses FFmpeg's asetrate filter, which re-labels the sample rate without resampling. When you tell FFmpeg that a 44,100 Hz audio file is actually at 44,100 × 1.122 Hz (for a +2 semitone shift), the encoder treats the audio as if it plays faster — shifting the pitch up by exactly 2 semitones. A subsequent aresample filter brings the sample rate back to 44,100 Hz, and an atempo correction filter restores the original playback speed.
The result: pitch changed, speed unchanged, duration unchanged. The same technique professional DAWs use for transposition, implemented entirely in your browser.
Understanding semitones
A semitone is the smallest interval in standard Western music — one piano key, or the distance from one fret to the next on a guitar. Twelve semitones equal one octave: pitching up 12 semitones doubles the frequency; pitching down 12 halves it.
Practical reference for common shifts:
−12 semitones: one full octave down. Dramatic pitch drop. −6 semitones: halfway down an octave (a tritone, or diminished fifth). −3 semitones: a minor third down — often used to lower a song from a major key to a minor key. −2 semitones: a whole tone down. Common key shift for singers. −1 semitone: a half step down. Smallest useful musical interval. +1 semitone: a half step up. +2 semitones: a whole tone up. +3 semitones: a minor third up. +6 semitones: a tritone up. +12 semitones: one full octave up.
Quality and output format
The pitch changer outputs MP3 at 192 kbps regardless of the input format. 192 kbps MP3 is transparent for music on virtually all consumer playback equipment — the quality is more than adequate for practice, production reference tracks, and karaoke use.
The pitch-shifting algorithm operates on the decoded PCM audio before encoding, so no double-lossy degradation occurs when processing an MP3 input. The main quality consideration is the asetrate resampling step: quality is highest for small shifts (±1 to ±3 semitones) and decreases somewhat for large shifts (±12 semitones, one octave). At ±6 semitones and below the output quality is imperceptible from the source for most material.
Privacy: your audio stays in your browser
Audio pitch-shifting services that work server-side upload your file, process it, and return the result — your audio passes through a third-party server. This tool runs entirely in your browser. FFmpeg compiled to WebAssembly processes your file in local browser memory. Nothing is uploaded. After page load, the tool works completely offline.
Disconnect from the internet after loading the page and the pitch changer still works — proof there is no server in the loop.
Frequently Asked Questions
Does pitch shifting change the speed or duration of the audio?
No. This tool shifts pitch while preserving both playback speed and duration. A 3-minute song stays 3 minutes after pitch shifting. The technique uses FFmpeg's asetrate filter combined with aresample and atempo corrections to separate pitch from speed — the same principle used in professional DAW transposition features.
What semitone shifts are available?
−12, −6, −3, −2, −1, +1, +2, +3, +6, and +12 semitones. Negative values shift pitch down; positive values shift pitch up. ±12 semitones equals one full octave.
What audio formats are accepted as input?
Any common audio format: MP3, WAV, M4A, AAC, FLAC, OGG, Opus, AIFF, WMA, plus video files (MP4, MOV, MKV, WebM) where the audio track is extracted and pitch-shifted. The output is always MP3 at 192 kbps.
How accurate is the pitch shift?
The asetrate method is mathematically precise — pitch is shifted by exactly 2^(semitones/12) relative to the original. Small shifts (±1 to ±3 semitones) produce very clean output. Larger shifts (±6 to ±12 semitones) may introduce mild resampling artifacts on some material, particularly vocals, but the result is musically usable.
Is there a file size or duration limit?
Free tier: 20 MB per file with output capped at 10 seconds as a preview. Pro ($9/month) removes the preview limit and raises the file size limit to 500 MB. Very long files may take longer to process in the browser depending on your hardware.
Can I pitch-shift a video file?
Yes — drop in an MP4, MOV, MKV, or WebM file and the tool will extract the audio track, pitch-shift it, and output an MP3. The video track is not preserved; use this for extracting and pitch-shifting audio from video.
Does the tool work on mobile?
Yes, on modern iOS and Android browsers (Safari 15.4+, Chrome for Android). Processing takes longer on mobile due to lower CPU performance — files under 20 MB work smoothly on most phones made after 2020.
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