Does changing pitch keep the original speed and duration?

No. The tool uses playback-rate resampling, so raising pitch speeds up and shortens the audio while lowering pitch slows down and lengthens it.

What formula converts semitones to playback rate?

The rate is 2^(semitones/12). +12 is 2×, 0 is 1×, and -12 is 0.5×.

What format does the tool download?

It creates a new uncompressed PCM16 RIFF/WAVE file. Original compression, tags, artwork, and other container metadata are not preserved.

Is my audio uploaded to a server?

No. File reading, browser decoding, offline resampling, and WAV encoding all run locally in the current tab on your Windows machine.

Which Windows browsers can I use?

Any modern browser that can decode common audio formats, including Microsoft Edge, Google Chrome, and Mozilla Firefox. Actual codec support still depends on the current browser, so a recognized extension does not guarantee that every unusual codec profile will decode.

Can I shift pitch on a Windows file without changing duration?

Not with this tool. It uses playback-rate resampling, so pitch and duration always move together. For pitch-only changes with the original length preserved, use a phase-vocoder or other dedicated time-stretching workflow.

Run an Audio Pitch Changer on Windows in Your Browser

An audio pitch changer on Windows is a browser-based tool that raises or lowers the perceived pitch of an audio file by any whole number from -12 through +12 semitones, with the entire process running locally in your browser and without uploading the file anywhere. On Windows 10 or Windows 11, you open the Audio Pitch Changer in Microsoft Edge, Google Chrome, Mozilla Firefox, or any other modern browser that can decode common audio formats, choose how many semitones to shift, and download a freshly rendered WAV file to a folder of your choice. The shift is a whole number between -12 and +12 semitones, where +12 raises the material by exactly one octave, -12 lowers it by exactly one octave, and 0 leaves the pitch unchanged. The tool uses playback-rate resampling, which changes pitch and duration together: a +12 shift runs at 2× speed and roughly halves the duration, while a -12 shift runs at 0.5× speed and roughly doubles it. Nothing is sent to a remote server, and the resulting file is a plain uncompressed PCM16 RIFF/WAVE audio file ready to drag into any Windows audio player.

What the Audio Pitch Changer does on Windows

The Audio Pitch Changer is a single browser page that reads one audio file from your local drive, decodes it with the Web Audio API, and renders a new WAV file with a pitch shift baked in. You control the shift with a single whole-number value, and the page reports the resulting duration before you commit to the render. The render happens through an OfflineAudioContext at the file's decoded sample rate, so the output sample rate matches the input rather than being resampled to a fixed value. The whole pipeline, including file reading, decoding, offline resampling, and WAV encoding, runs inside the current tab on your Windows machine; no source audio or rendered audio is sent to any server.

Why a browser-based approach fits Windows

Installing dedicated audio software on Windows is often heavy, requires admin rights, and pulls in drivers, codecs, or a DAW you may only need once. A browser-based pitch changer sidesteps that: there is nothing to install, no codec pack to maintain, and no system-wide driver to update. It also keeps your file private because the decoding, resampling, and encoding happen in the current tab rather than on a remote server. For Windows users on shared or managed machines, that means you can pitch-shift an audio file from a standard user account without contacting IT, and you can close the tab when you are done to release every resource the render allocated.

Pitch, semitones, and the playback-rate formula

The pitch grid follows twelve-tone equal temperament. Each semitone corresponds to a frequency ratio of 2^(1/12), and one octave contains 12 equal semitones. McGill University's course material on MIDI and frequency conversion states this directly, and the W3C Web Audio specification matches it with a cents factor of 2^(detune/1200), since 1200 cents equal 12 semitones.

For a chosen integer semitone shift n, the tool sets the source playback rate to 2^(n/12). MDN documents playbackRate as a proportion of the original sampling rate, with values below one slowing the audio and values above one speeding it up, and confirms that any non-unit rate causes resampling. The table below summarizes the rates the tool applies to common shifts; values are computed with the same 2^(n/12) formula the page uses internally.

Semitone shift	Playback rate	Pitch effect	Duration effect
-12	0.5×	One octave down	Roughly twice as long
-7	≈0.667×	Perfect fifth down	Noticeably longer
-5	≈0.749×	Perfect fourth down	Longer
-1	≈0.944×	One semitone down	Slightly longer
0	1×	Unchanged	Unchanged
+1	≈1.059×	One semitone up	Slightly shorter
+5	≈1.335×	Perfect fourth up	Shorter
+7	≈1.498×	Perfect fifth up	Noticeably shorter
+12	2×	One octave up	Roughly half

Worked example: a perfect fifth up is n = +7, so the rate is 2^(7/12). 7/12 ≈ 0.5833, and 2^0.5833 ≈ 1.498. The render therefore plays at roughly 1.5× the original speed, and the resulting WAV is about two-thirds the original duration.

How to shift pitch on Windows with Audio Pitch Changer

Open the Audio Pitch Changer page in Microsoft Edge, Google Chrome, or Firefox on your Windows 10 or Windows 11 PC.
Click the file picker and choose one audio file from a folder on your local drive. The file must be at most 50 MiB and in a format the current browser can decode, such as MP3, WAV, M4A, AAC, Ogg, WebM, or FLAC.
Enter a whole-number pitch shift between -12 and +12 in the semitones field. Remember that +12 raises pitch by one octave, -12 lowers it by one octave, and any non-zero shift also changes duration because of the playback-rate resampling method.
Trigger the local render. The tool computes the required output frame count as the ceiling of the input frames divided by the playback rate, and renders the complete file through an OfflineAudioContext at the decoded sample rate.
Read the stated duration change on the page. If the new duration matches what you want, continue; if not, adjust the semitone value and re-render. Changing the input or the semitone value invalidates the previous result before the next render starts.
Download the rendered WAV file to a folder on your Windows machine. The page intentionally does not play a browser preview of the result, so opening the downloaded file in a trusted local player is the verification step.

What you get in the downloaded WAV

The downloaded file is a new uncompressed PCM16 RIFF/WAVE container. Samples are interleaved across channels, stored as 16-bit little-endian integers, and clipped to the legal -1 to +1 range during the float-to-int conversion. The sample rate of the output matches the decoded sample rate of the input, so an MP3 decoded at 44,100 Hz produces a 44,100 Hz WAV.

The export does not preserve the original codec, compression quality, bitrate, ID3 or other tags, artwork, chapters, cue points, loop metadata, or container metadata. PCM16 quantization can also differ from the decoded floating-point source, and the browser's resampling quality is implementation-defined. Strong upward shifts can reveal aliasing or codec artifacts that were less obvious in the original file, so the output is best treated as a quick creative or practice asset rather than a transparent mastering process.

Input and output limits on Windows

Every limit is checked before the tool commits to a render, so a failed limit produces an error message and no download rather than a partial file. The limits are:

One file per render, up to 50 MiB.
Decoded audio up to 5 minutes of duration.
Up to 8 channels.
Sample rate from 8,000 Hz through 192,000 Hz.
Up to 30 million channel samples for the decoded input.
Up to 30 million channel samples for the pitch-shifted output.

The output limit interacts with the input limit because lowering pitch produces more output frames than input frames. An input that passes the decoded limit can still fail the output limit when the chosen shift is far enough below zero. In that case the message states that the requested shift is over budget and that nothing was truncated. Empty files, unsupported types, invalid decoded dimensions, and failed decodes are rejected.

When to pick a different Windows workflow

The Audio Pitch Changer is the right fit when you want a quick, local pitch shift on a single file and you do not need the original duration to survive. It is not the right fit when a production requires pitch change with the original length preserved. That job belongs to a phase-vocoder or other dedicated time-stretching workflow, which the tool never claims to provide.

If your Windows workflow happens inside a DAW such as Audacity, Reaper, or FL Studio, those tools have native pitch controls with their own trade-offs. If your workflow happens inside a video editor such as CapCut or DaVinci Resolve, those editors offer pitch shifts that are scoped to the project timeline. The Audio Pitch Changer is the browser tab you open when you want a fast local result without launching a heavy application.

Putting it together on Windows

The fastest path on a Windows PC is to open the Audio Pitch Changer, choose a file, set a semitone value, render, and download the WAV to a folder you control. Because everything happens in the current tab, you can also try several semitone values in a row without losing your original file: the original stays untouched on disk, and each render replaces the previous download link. When you are happy with the result, play the downloaded WAV in Windows Media Player, foobar2000, or any other trusted local player to confirm it sounds the way you expect.