Adobe Audition gives you three working ways to change audio speed: press J/K/L for temporary transport-speed control, apply the Stretch and Pitch effect for permanent playback-rate changes, or open the Time and Pitch effect to retime without altering other properties. The fastest path during editing is the JKL shuttle, which lets you press J to rewind, K to pause, and L to play at speeds from 1× up to roughly 8×, with combined presses changing direction and tempo on the fly. For a permanent file-level speed change, most users open Effects → Time and Pitch → Stretch and Pitch, choose a Speed value, and render the change directly into the waveform. These built-in tools cover routine speed edits inside Audition, but if you only need a one-off WAV copy without launching the application, the Audio Speed Changer handles the same task entirely in your browser.
Three built-in ways to change audio speed in Adobe Audition
Audition exposes speed changes at three different layers, and which one you want depends on whether you need a temporary preview or a baked-in render. The transport layer uses keyboard shortcuts to vary playback without touching the file. The effect layer offers two distinct processors that retime the waveform itself. Picking the right one up front saves a round trip through the undo history and avoids re-rendering a long file more than once.
| Method | Type | Best for | Pitch behavior |
|---|---|---|---|
| JKL shuttle | Transport control | Quick preview while editing | Follows the chosen speed |
| Stretch and Pitch effect | Rendered effect | Permanent playback-rate change baked into the waveform | Follows the chosen speed |
| Time and Pitch effect | Rendered effect | Detailed retime with independent sliders | Adjustable, can be isolated from stretch |
All three methods can change duration, but only the third opens a separate dialog where you can isolate duration from pitch when you want. The first two are intentionally simple so you can stay in the editing flow without leaving the Waveform Editor.
Using the JKL shuttle for temporary speed control
The JKL keys are the fastest way to scrub through a clip at a different speed without modifying any audio data. Press L once to start playing at normal speed, press it again to accelerate, and keep pressing to move up through the shuttle steps. Press J to rewind at increasing speeds, and press K to pause. Press K twice to pause and recenter playback on the cursor. Combinations such as J plus L shuttle backward and forward at the same time, which is useful for finding a precise edit point or for skimming long interviews.
This is a preview-only feature. The waveform on disk is untouched, so nothing changes when you export. If you only want to listen at a different speed while you set markers or trim handles, the JKL shuttle is the right tool. It also costs nothing to try, so it is a good first stop before opening any effect dialog.
Stretch and Pitch: a permanent, renderable speed change
When you want the exported file to play faster or slower, apply Stretch and Pitch as an effect. Open the waveform in the Waveform Editor, select the region you want to retime, and choose Effects → Time and Pitch → Stretch and Pitch. In the dialog, set the Speed value, with 100 meaning no change, values above 100 speeding the clip up, and values below 100 slowing it down. Preview the result with the dialog's Play button, adjust if needed, and click Apply to render the change into the waveform.
Because this is a normal Audition effect, you can apply it to the whole file, to a selection, or to multiple files through the Batch Processing panel. The rendered result replaces the original selection, so Undo is still available if you want to compare against the source. Once baked in, the new tempo follows the file into any downstream export or session.
Time and Pitch effect for advanced retime options
For finer control, the Time and Pitch dialog exposes the same engine with extra sliders. Open Effects → Time and Pitch → Time and Pitch to see separate controls for Stretch, Pitch Shift, and Preserve Voice Quality. Stretch changes duration, Pitch Shift moves pitch in semitones, and Preserve Voice Quality helps spoken-word clips stay intelligible at large stretch ratios. The dialog also surfaces the algorithms Audition uses under the hood, so you can trade speed for quality on long files.
This is the right panel when you want to slow a lecture to 0.75× without making the speaker sound like a chipmunk, or when you need to retime a vocal take while nudging the tuning by a few cents. Leave Pitch Shift at 0 to retime without changing the musical key. The Apply button renders the change into the waveform, and the file plays back at the new tempo immediately in the Waveform Editor.
A browser-based alternative when Audition is overkill
Sometimes you do not need an editor — you just need a faster or slower WAV copy of a clip. For those cases, the Audio Speed Changer decodes the selected file locally in your browser, runs it through an offline audio renderer at your chosen playback rate, and exports a fresh PCM16 WAV. Nothing is uploaded, which keeps the source file private and removes the round trip through Audition's project panel.
- Choose an audio file up to 25 MB. The file stays in your browser and is not sent to a server.
- Pick a speed from 0.5× to 2× after the audio has decoded. Faster or slower playback changes pitch together with duration, so preview before committing.
- Select Change speed and export WAV, preview the rendered result, then download the PCM16 WAV file to your computer.
The page reports the new duration and file size before you download, so you can confirm the speed change matched what you expected. Because the output is uncompressed PCM16 WAV, the downloaded file is typically larger than a compressed source even when it is shorter. The tool also drops ID3 tags, artwork, chapters, and the original codec, so it is not a substitute for re-saving an MP3 in place. For a deeper walkthrough of the local pipeline, see the guide on changing audio speed and exporting WAV locally.
What speed changes do to duration and pitch
Changing the playback rate moves duration and pitch together. At 2×, a one-minute source becomes about 30 seconds long and sounds an octave higher. At 0.5×, the same clip becomes about two minutes long and sounds an octave lower. This is standard playback-rate rendering, not pitch-preserving time stretching, so a vocal take will sound like a slowed-down or sped-up vocal take rather than a retimed one. Audition's Time and Pitch dialog isolates pitch from duration with its own slider, and pitch-preserving tools exist for cases where the musical key must stay fixed.
Limits and file handling to keep in mind
Browser-decodable audio is the key constraint. Files that your current browser cannot decode will surface an error in the tool and produce no output. For predictable memory use, the renderer caps inputs at 25 MB, 15 minutes, eight channels, 192 kHz, and 30 million rendered samples. The downloaded WAV follows the standard RIFF/WAVE layout with interleaved little-endian PCM16 samples, which most editors and players read without any extra import step. If you need the source codec, bitrate, or embedded metadata preserved, render inside Audition instead and export to your original container.
The Web Audio API specification describes the OfflineAudioContext and AudioBufferSourceNode playbackRate used for this kind of local rendering, and the Microsoft WAVEFORMATEX documentation defines the PCM16 RIFF/WAVE layout the output follows.