Skip to main content
Bethemesh
Audio

Audio speed changer

Change audio speed locally from 0.5× to 2× while preserving pitch, without uploading the file.

Open in Workspace

Embed this widget

Customize the result, check the live preview, then copy the code.

Preview

Embed code type

Code to copy

Responsive and automatically resized by Bethemesh.

  • 100% local
  • Free
  • No account
  • Batch processing
  • Workspace compatible

Why use this tool?

Speed adjustment makes playback faster or slower from 0.5× to 2× while using processing that preserves the pitch of voices and music.

100% local and secure

Your data stays on your device and is never sent to our servers.

Smart processing

Generate, convert, or validate technical data with purpose-built controls.

Supported formats

Technical formats and syntaxes suited to each generator, converter, or validator.

Save time

Get a clean, ready-to-use result in seconds without installing software or configuring a complex workflow.

Fonctionnement

How does this tool work?

Speed adjustment makes playback faster or slower from 0.5× to 2× while using processing that preserves the pitch of voices and music. The shared Audio engine validates the settings, loads FFmpeg/WASM on demand, and applies the transformation without sending media to a server. The resulting file becomes either a local download or a typed audio resource passed to the next Workspace step. This architecture avoids maintaining different business logic for the public tool, widget, and pipelines.

Use cases

Audio publishing

Prepare a more consistent file before publishing it on a website, podcast feed, or sharing platform.

Batch processing

Apply exactly the same settings to several files through automatic collection mapping in Workspace.

Pipeline preparation

Place this operation between audio import and conversion or download steps in a reproducible workflow.

Guide

How to use this tool

  1. 1

    Import the file

    Choose a compatible audio file among the formats supported by the local processing engine.

  2. 2

    Configure processing

    Set the required options and run the transformation directly inside your browser.

  3. 3

    Download the result

    Download the generated file or reuse the exact same operation inside a Workspace pipeline.

Tips and best practices

  • Files stay in the browser and are not uploaded to a Bethemesh server.
  • Long or uncompressed files can require substantial memory while FFmpeg/WASM is processing them.
  • For repetitive work, use Workspace to keep identical settings across a whole audio collection.

Frequently asked questions

Is the audio file uploaded to a server?

No. Processing runs locally in your browser and the source audio is not uploaded to Bethemesh.

Why can the first operation take longer?

The FFmpeg/WASM engine is loaded on demand the first time an operation needs it and then remains available for the session.

Can I use this operation in Workspace?

Yes. The same shared transformation is available in pipelines and can be mapped automatically over an audio collection.

Was this tool useful?

Read next

Recommended workflow

Continue your processing

Discover tools that naturally fit before, after, or alongside this one.

Complementary tools

Audio

Audio loudness normalizer

Normalize the perceived loudness of an audio file to a LUFS target.

100% localNew
Use this tool