---
title: "Audio Speed Changer – Adjust Tempo & Pitch — Nexvert"
description: "Change audio tempo and speed with optional pitch preservation using time-stretching. Free, runs locally in your browser, and keeps files private."
url: https://nexvert.online/audio-speed-changer/
---

# Free Audio Speed & Tempo Changer

Change audio tempo and speed with optional pitch preservation using time-stretching. Free, runs locally in your browser, and keeps files private.

## What is Audio Speed & Tempo Changer?

Speed up long lecture recordings to study faster or slow down difficult musical passages to learn instruments. Adjust playback tempo smoothly with optional pitch lock to prevent the chipmunk effect.

## How to use Audio Speed & Tempo Changer

1. **Add your file or input** — Choose a supported file, drag it onto the upload area, or type/paste the data this tool works with.
2. **Adjust the options** — Pick the output format, quality, size or other settings the tool offers. Defaults work well for most files.
3. **Process and download** — Run the tool and save the result. Processing happens in your browser, so nothing is uploaded to a server.

## Frequently asked questions

### What is the difference between tempo change and pitch shift?

Changing tempo alters playback speed while preserving the original musical key and voice pitch. Pitch shift changes the acoustic key without altering duration.

### What playback speed range is available?

You can adjust speeds continuously from 0.25x (ultra-slow motion) up to 3.0x (high-speed briefing).

### Does changing speed work on both MP3 and WAV files?

Yes, all standard browser-supported audio formats can be re-timed and exported directly to your device.

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Source: https://nexvert.online/audio-speed-changer/
HTML version: https://nexvert.online/audio-speed-changer/