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Private browser utility / Social & Creator

Free Audio Speed Changer

Runs entirely in your browser - no upload, no sign-up.

Live workspaceLocal processing
Choose audio to slow down or speed up

Your source and changed audio stay in this browser tab. The audio is never uploaded.

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audio speed changer / browser utility
01 / Overview

What is an audio speed changer?

An audio speed changer makes a recording, podcast, or song play slower or faster without shifting its pitch. Choose a local audio file, set a speed from 0.5x to 2x, preview the new pace, and download a WAV. Processing stays in your browser, with no upload or account.

02

How to use

  1. 01
    Choose your audio

    Drop an MP3, WAV, M4A, FLAC, OGG, AAC, or another common audio file into the tool.

  2. 02
    Set the speed

    Pick a preset or move the slider from 0.5x to 2x, then use the player to preview the pitch-preserving playback.

  3. 03
    Create the result

    Start the local conversion and wait while the browser changes the tempo.

  4. 04
    Preview and download

    Listen to the finished WAV, then download it or change the setting and try again.

03

Who it's for

  • Podcast and lecture listeners can speed up long recordings before saving a portable copy.
  • Musicians and language learners can slow difficult passages while keeping notes and voices near their original pitch.
  • Editors and researchers can test timing changes for voiceovers, interviews, and rough cuts without uploading source material.
  • Creators can make a faster or slower WAV for a presentation, practice track, or later edit.

The preview uses your browser's pitch-corrected playback, so you can test a speed immediately. Export loads a WebAssembly build of FFmpeg only when you create the result, then applies time stretching and writes a lossless 44.1 kHz stereo WAV.

Changing tempo is not the same as changing pitch. A 1.5x setting shortens the duration to two thirds of the original while keeping speech and music near the same perceived key. Browser memory makes this best for short or moderate files; very large or damaged audio may need a desktop editor.

FAQ

Is my audio uploaded?

No. The source file, preview, conversion, and result remain in your browser tab. The first export downloads the audio engine code, but your recording is not sent with that request. Closing or refreshing the tab releases the temporary local file URLs.

Is this audio speed changer free?

Yes. You can preview, process, and download speed-adjusted audio without an account, subscription, credit limit, or watermark. The practical limits come from your device's memory and processing speed, especially when a long compressed file becomes a much larger WAV.

What audio speed and file limits apply?

You can choose any speed from 0.5x to 2x in 0.05 steps. The conservative file cap adapts from 100 MB on mobile or lower-memory devices to 250 MB on typical desktops and 500 MB on high-memory desktops.

Can I change audio speed without changing pitch?

Yes. The preview asks the browser to preserve pitch, and the downloaded result uses FFmpeg's atempo time-stretching filter. Voices should not become chipmunk-like at faster speeds or unusually deep at slower speeds, though difficult music can reveal small processing artifacts.

Which audio formats can I use?

The tool accepts common audio files including MP3, WAV, M4A, AAC, FLAC, OGG, Opus, AIFF, WebM audio, and WMA. Browser preview support varies by codec, but the local FFmpeg engine may still export a WAV when the built-in player cannot preview the source.

Why does the downloaded WAV use more space?

WAV stores uncompressed 16-bit PCM audio, so it is usually much larger than MP3, M4A, or OGG. The benefit is a broadly playable, lossless result that avoids another compressed encoding pass and is convenient for later editing.