How to Change Audio Playback Speed

Speed changes how audio serves you. Slow a language lesson down to catch every word, speed a podcast up to get through it faster, slow a piece of music to learn it note by note. Changing audio speed adjusts how fast a recording plays. The catch is doing it without turning voices into chipmunks or bullfrogs — and that comes down to one setting. This guide explains speed change, the pitch problem, and its best uses.

The pitch problem — the thing that matters most

Change speed naively and pitch changes with it: speed up and everyone sounds squeaky; slow down and they sound like a slowed-down record. That is often not what you want. Good speed adjustment offers pitch preservation (sometimes called time-stretching), which changes the tempo while keeping voices and music at their natural pitch. When available, this is almost always the setting you want for speech.

• Pitch preserved — a 1.5× podcast still sounds like the host, just faster. Ideal for speech.
• Pitch not preserved — the classic sped-up/slowed-down effect. Useful only when you *want* that sound.

How to change audio speed with this tool

1. Open the Change Audio Speed tool.
2. Load your audio file.
3. Set the speed multiplier — below 1× to slow, above 1× to speed up.
4. Apply and download.

Everything runs in your browser, so your audio is never uploaded.

Choosing a speed

• 1.25×–2× faster — for podcasts, lectures, and audiobooks you want to get through quickly. Most people acclimate to 1.5× within minutes.
• 0.5×–0.9× slower — for transcription, language learning, or catching fast or unclear speech.
• Extreme changes (below 0.5× or above 2.5×) start to sound artificial even with pitch preservation; use them sparingly.

Common uses

• Speed up podcasts and lectures to save time.
• Slow down speech to transcribe or study it.
• Learn music or language at a comfortable pace.
• Fit audio to a time slot by nudging the speed.

Related tools

Trim before or after with Cut Audio. If a slowed recording is quiet, Volume Booster helps. Convert the result for your player with Convert Audio Formats. To change the speed of a whole video instead, that is a video-tool job.

Privacy and limits

Speed change is fully local — no upload, no file-size limit, nothing stored, offline once loaded. Open the Change Audio Speed tool to set your pace.