Change Audio Speed Online Free — Slow Down or Speed Up Music

A free audio speed changer that adjusts playback from 0.25× to 4× without affecting the pitch. Ideal for music practice, transcription, and language learning.

How to Change Audio Speed

1

Upload your audio file (drag and drop or click to browse)

2

Move the speed slider to your desired playback rate

3

Click the button to process — done in seconds

4

Download your speed-adjusted audio file

Slow down or speed up any audio file while keeping the pitch natural

Drop audio or video here or click to browse
MP3, WAV, OGG, FLAC, AAC, M4A, M4B, WMA, AIFF, OPUS, WEBM, CAF, 3GP, MP4, MOV, MKA, MKV, AVI, WMV, FLV, M4V, TS, MTS, M2TS, VOB, MPG, MPEG, OGV ·
Loading file...
0%
Upload a file to start
File:
Duration:
Size:
0:00
0:00
50%
0:00 / 0:00
1x
Speed
1.00x
0.1x1x2x4x
Keep original tone when changing speed
Speed Regions

Select a section on the waveform and set a different speed for it. Click "Add Region", then drag on the waveform.

No regions yet. Add a region to change speed in a specific section.
BPM
—
Original
Target BPM:

Auto-calculate speed from target BPM

A-B Loop
A: —   B: —
Smooth transition at loop start/end
Training Mode
Gradually increase speed for practice. Perfect for musicians.
Current: 0.50x Progress: 0%
Keyboard Shortcuts
Space Play / Pause
← Seek back 5s
→ Seek forward 5s
↑ Speed +0.05x
↓ Speed -0.05x
[ Set loop point A
] Set loop point B
R Reset speed to 1x
M Toggle metronome
Format:
Quality:

Features

Speed range 0.1x to 4x with pitch preserved A-B loop for practicing difficult sections Training mode with gradual speed increase BPM detection and target BPM matching

Why Use Our Speed Changer

No software to install, no account needed. Change the speed of any audio file for free with natural-sounding results. Perfect for musicians learning songs, students speeding through lectures, language learners practicing pronunciation, transcribers slowing down recordings, or DJs preparing sets. Runs in your browser via Web Audio API.

Frequently Asked Questions

Does changing speed affect the pitch?

No. Our tool uses pitch-preserving time-stretch algorithms. Slowing down a song will not make voices deeper, and speeding up will not create a chipmunk effect. The pitch stays natural at any speed.

What speed range is available?

You can adjust speed from 0.25x (four times slower) to 4x (four times faster). For most uses, 0.5x to 2x delivers the best balance between quality and usefulness.

Can I slow down a song to learn it on guitar or piano?

Yes! This is one of the most popular uses. Slow down to 0.5x or 0.75x to hear every note clearly, practice the part, then gradually increase the speed until you can play at full tempo. Use the BPM finder to detect the exact tempo first.

Is there a file size limit?

Processing happens in your browser using WebAssembly, so there is no strict server-side limit. Files up to 100 MB work smoothly on most devices.

Will the audio quality be reduced?

The time-stretch algorithm preserves audio quality well for moderate speed changes (0.5x–2x). Extreme changes (below 0.25x or above 3x) may introduce subtle artifacts, which is normal for any speed-changing technology.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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Who is this tool for?
🎵 Musicians & Producers 🎙️ Podcasters 🎓 Students 📖 Audiobook Narrators
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