Audio Speed Changer
Change audio speed online — fast, private, and 100% client-side
No Upload
Instant
Mobile Friendly
Pitch Control
Drop your audio file here
or click to browse
MP3, WAV, OGG, FLAC, M4A — Max 100MB
File Name—
Format—
File Size—
Sample Rate—
Channels—
Original Duration—
Adjusted Duration—
Current Speed1.00×
Speed Settings
0.25×
4×
1.00×
Normal Speed
100%
Waveform
1.00×
0:00
0:00
Processing Audio
Initializing...
Audio processed successfully!
Speed: 1.00× — Duration: 0:00
How To Change Audio Speed
1
Upload Your Audio
Drag and drop or click to select any audio file up to 100MB.
2
Choose Speed
Pick a preset from 0.25× to 4× or use the custom slider for precise control.
3
Adjust Pitch Option
Toggle "Preserve Pitch" to maintain the original key when changing speed.
4
Preview the Result
Listen to your audio at the new speed before committing to export.
5
Export & Download
Click "Export & Download" to process and save your modified audio as a high-quality WAV file.
Frequently Asked Questions
An Audio Speed Changer is a tool that lets you increase or decrease how fast an audio file plays. It's widely used by podcast listeners who want to consume content faster, musicians practicing at slower tempos, language learners adjusting speech speed, and video editors matching audio timing to visuals.
Yes, this tool is 100% free with no usage limits, no watermarks, no sign-up requirements, and no hidden fees. You can process as many audio files as you need without any restrictions.
Simply upload your audio file, select a speed preset (like 2× for double speed or 0.5× for half speed) or drag the custom slider to your exact desired speed. Click "Preview" to listen, then "Export & Download" to save the result. The entire process happens in your browser.
Nine presets are available: 0.25× (ultra slow), 0.5× (slow), 0.75× (moderate slow), 1× (normal), 1.25× (moderate fast), 1.5× (fast), 2× (double speed), 3× (very fast), and 4× (extreme). You can also use the custom slider for any speed between 0.25× and 4× in 0.05× increments.
By default, changing audio speed also changes pitch — faster playback sounds higher-pitched (like a chipmunk), and slower playback sounds lower. "Preserve Pitch" uses an advanced time-stretching algorithm (WSOLA) to change speed while keeping the original pitch intact, similar to what professional DAW software does.
Time-stretching algorithms introduce some artifacts, especially at extreme speed changes. For moderate adjustments (0.75× to 2×), the quality is excellent and artifacts are virtually imperceptible. At very extreme settings (0.25× or 4×), you may notice slight phasing or flanging effects, which is a limitation of all time-stretching technology.
Without pitch preservation, quality loss is minimal — it's essentially a resampling operation. The output is a 16-bit PCM WAV file, which is lossless. With pitch preservation enabled, there may be minor artifacts as described above, but the output remains high-quality 16-bit PCM WAV.
This tool supports all formats that your browser can decode, including MP3, WAV, OGG/Vorbis, FLAC, M4A/AAC, WMA, and WebM. The output is always a standard WAV file (16-bit PCM), which is universally compatible with all audio players, video editors, and DAW software.
Absolutely. MP3 is one of the most commonly used formats with this tool. Upload your MP3, adjust the speed, and download the result as a high-quality WAV file. If you need the output in MP3 format, you can convert the downloaded WAV using any free audio converter.
No. All audio processing is performed entirely in your web browser using the Web Audio API. Your files never leave your device — they are not uploaded, transmitted, or stored on any server. This tool works completely offline once the page is loaded.
Your audio data is completely safe. Since processing happens locally in your browser, there is zero risk of data interception, leakage, or unauthorized access. No one — not even the tool developer — has access to your audio files.
Yes, this tool is fully responsive and works on all modern mobile browsers including Safari on iPhone, Chrome on Android, and Firefox Mobile. The interface adapts to smaller screens with full-width buttons and stacked layouts for easy use on any device.
The tool accepts files up to 100MB on all devices. However, very large files combined with pitch preservation may require significant memory on mobile devices. For best performance on mobile, we recommend files under 30MB when using the pitch preservation feature.
Privacy Guaranteed: All audio processing is performed entirely in your browser. No audio files are uploaded, stored, or transmitted to any server.
Change audio speed instantly — flexible, private, mobile-friendly, and 100% client-side.
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