toolkitta.
Local file processing

Change Audio Speed & Pitch

Speed up a podcast or lecture, slow down a song to learn it, or move it to a new key. Voices stay natural, you can preview first, and nothing is uploaded.

Your audio is never uploaded

Change speed and pitch for one file or a batch. Preview before saving. Edit in editor carries your settings onto the timeline.

  • Speed & pitch controls
  • Preview before downloading
About Batch and Interactive Editor

How to use Interactive Editor

  1. Choose Interactive Editor to arrange your original audio, or use Edit in editor to carry your current settings across.
  2. Set speed and pitch for individual clips on the timeline. Select a clip to open its controls. Undo and Redo let you try changes.
  3. Listen, choose an output format under Export, then export and download your mix. Save a project to continue later.

Batch keeps its settings and results when you switch modes. Interactive Editor opens original audio; Edit in editor also carries the selected settings. Save a project to keep tracks editable. Export a recipe to reuse a composition in either workflow mode.

The editor supports 20 audio sources, 50 MB each, 150 MB total and 15 minutes per source, with a 30-minute composition. Batch retains its existing limits. The final editor mix uses a peak limiter; heavily boosted Trimmer cuts can sound different from Batch’s clipping.

How it works

How to change the speed or pitch of audio

  1. Add up to 20 audio files: MP3, WAV, M4A, FLAC, Ogg, Opus or WebM, 500 MB each.
  2. Choose a speed from 0.5× to 2×, or Custom for 0.25× to 4×. Keep Natural pitch for speech, choose Shift pitch to move the key by semitones, or Like a record to let the pitch follow the speed.
  3. Use Preview 10 seconds to listen, then use the speed-change button, whose label shows the file count. Listen to each result and download in your chosen format.

Halve a practice recording’s playing time

Add the 40-second practice WAV. Choose 2× and Natural pitch, choose WAV under Save as, and use Preview 10 seconds before Change speed of 1 file.

The 40-second source should become about 20 seconds. The tone should keep approximately the same pitch while its pattern plays faster. Compare Like a record to hear the tone rise instead; speed processing can introduce artifacts.

To practise a passage slowly, try 0.5×: the same source becomes about 80 seconds. Changing speed does not recover detail or remove noise.

Frequently asked questions

Useful details

4 answers
Will voices sound like chipmunks?

Not with Natural pitch: the sound is stretched in small overlapping pieces so voices keep their pitch at any speed. Choose Like a record if you want the classic sped-up, higher sound.

Can I change the key of a song without changing its speed?

Yes. Leave the speed at 1×, choose Shift pitch and move the slider. Each step is one semitone; a larger shift sounds less natural, especially on voices.

What is the Preview button playing?

The first file, processed exactly as it will be saved, for 10 seconds from where its player is. Move the player's position to preview another part. To start encoding, use the speed-change button, whose label shows the file count; with one file ready, it reads “Change speed of 1 file”.

Are my files uploaded?

No. Decoding, the speed and pitch change and encoding all run in your browser. Encoder code is downloaded from this site the first time a format needs it; your audio never leaves your device.

More help

Guides, common conversions and useful next steps.

Edit the audio

Arrange clips, mix tracks and add fades on a local timeline.

Continue with your result

Use the action beside a finished result to send it directly, or open another tool: