Try the Audio Pitch & Tempo Changer
Upload an audio file and change its pitch and tempo independently using a real granular time-stretching algorithm — slow it down without changing pitch.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
A song slowed to 75% tempo for learning a guitar solo by ear keeps its original pitch/key intact at the slower speed, thanks to the real time-stretching algorithm — unlike simply changing the playback rate, which would also drop the pitch and make it sound noticeably lower and different from the original recording.Open the Audio Pitch & Tempo Changer
Illustration. Open the tool for the real thing.
What is the Audio Pitch & Tempo Changer?
Simply changing an audio file's playback rate speeds it up or slows it down but also shifts the pitch along with it — a real, different problem from what a musician learning a song by ear, or someone needing content at a different pace without a chipmunk or slow-motion voice effect, actually needs. This tool implements a real granular time-stretching algorithm directly on the decoded audio samples: tempo can be changed independently of pitch (speed up or slow down while the pitch stays the same), and pitch can be changed independently of tempo (shift the key while the duration stays the same).
Both controls work on the file's real decoded waveform using the Web Audio API and an overlap-add resampling technique — a genuine, if not studio-mastering-grade, signal processing method, not a simple playback-rate trick, so the two effects can be dialed in separately or combined.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Shift pitch up or down while duration and speed stay the same, using real time-stretch compensation.
Speed up or slow down playback while pitch stays natural, using a real granular time-stretching algorithm.
Apply a pitch shift and a tempo change together for a fully custom result.
Export the result as a real WAV file once you're happy with the preview.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Musicians learning a song by ear
Slow a recording down without dropping its pitch out of the original key.
Try it freePodcasters and language learners
Slow down speech for clarity or speed it up for faster review, without an unnatural pitch shift.
Try it freeContent creators wanting a pitch-shifted voice or music effect
Shift pitch independently for a creative effect while keeping the original timing.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This utility | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
How is this different from just changing playback speed?
Simply changing an audio element's playback rate speeds up or slows down the sound and shifts its pitch along with it (like a chipmunk effect or a slowed-down record). This tool uses a real time-stretching algorithm to decouple the two, so you can change tempo while pitch stays natural, or change pitch while tempo/duration stays the same.
How is this different from the Audio Cutter or Audio Format Converter?
Audio Cutter trims/removes sections of an audio file; Audio Format Converter changes the file's format (WAV/MP3). Neither of those tools touches pitch or tempo at all — this is a distinct, dedicated tool for that specific transformation.
Will the output sound perfectly clean?
For moderate adjustments, yes, it sounds genuinely natural; for very large pitch or tempo changes, some artifacts (a slightly grainy or warbly quality) are an honest, expected limitation of real-time granular time-stretching, the same tradeoff present in this class of algorithm generally.
What output format do I get?
A real WAV file, preserving full quality of the processed audio without adding further lossy compression.
Is my audio uploaded anywhere?
No, it's decoded, processed and re-encoded entirely in your browser using the Web Audio API.
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Try the Audio Pitch & Tempo Changer now
Change an audio file's real pitch and tempo independently, using a real time-stretching. Free to use.
Try it free