Batch Audio Speed Changer

Batch adjust the playback speed of audio files, supporting 0.5–5x speed changes. Speed up or slow down MP3, WAV, and other formats.

Bug report

Browser execution mode: Your data is processed in your browser and is not uploaded to the server.

Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

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If the online tool fails to load or run, try the desktop tool.https://tools.yikeaigc.com/

Tool Usage

Return to old version

A desktop version is available with more powerful, stable features. Open desktop version

Select audio and set speed, format, quality, and other options before batch processing. All processing is done locally on this device; files are not uploaded to the server.

1Select Audio Files

Click to select or drag audio here

Supports common audio formats such as MP3, WAV, AAC, M4A, FLAC, OGG, OPUS, WEBM, and AIFF. The list shows only the first 20 files; all files will be processed.

2File Overview

Selected Files0

Total Size0 B

Estimated DurationPending

Load one short audio file first to test the speed and output format before processing many files.

3File Preview

No file selected

Select an audio file or click “Load Sample Audio”.

1Speed

0.5x Slower 1.0x Original 5.0x Faster

1.00x Keep original speed

Enter multiplier

Less than 1 slows down; greater than 1 speeds up.

Volume compensation

Increase if it sounds too quiet after speeding up.

ZIP file name

Only affects the downloaded archive name.

2Output & quality

Output format

Keeping source format uses the original file extension; if encoding is not supported, it switches to WAV.

Compressed format bitrate

MP3, M4A, and OGG use this setting.

Sample rate

Keep the source sample rate unless needed.

Channels

Use mono for speech audio to reduce file size.

Output filename

If names conflict, a number is added to the filename.

Fallback format

This format will be tried if the target encoding is unavailable.

3Processing options

Keep pitchUse tempo speed change to help avoid obvious pitch changes in speech or music. Normalize loudnessNormalize loudness across clips, ideal for batch voice files. Keep metadataTry to keep original tags such as title, artist, and album. Continue on failureContinue processing remaining files if some fail, and show the reason in results.

1Batch Processing

Processing engine not loaded

The local FFmpeg component will load after you start processing. First load may take some time.

Confirm files and settings, then click Start processing.

Pending files0

Speed1.00x

Output formatKeep source format

Keep pitchYes

Result namingOriginal filename

Keep this page open when processing many files. The first 20 files are shown; the ZIP will include all successful results.

1Download Results

Processed successfully0

Processing failed0

ZIP statusNot generated

After processing, the first 20 results and download link will appear here.

Instructions

Software Instructions

Select audio files: Click the "Select or drag in audio files" button to choose the audio files you want to process. Supports MP3, WAV, AAC, FLAC, OGG, M4A, and other formats.
Set the speed multiplier: Use the slider or input box to set the speed multiplier, ranging from 0.5x to 5.0x. Less than 1.0 slows down the audio, while greater than 1.0 speeds it up.
Select output format: Choose the output audio format. WAV is recommended for ideal compatibility.
Start processing: Click the "Start Processing" button, and the tool will automatically process all selected audio files.
Download results: After processing is complete, click the "Download All Results (ZIP)" button to download the processed audio files.

FAQ

A: Mainstream audio formats such as MP3, WAV, AAC, FLAC, OGG, and M4A are supported. WAV is recommended as the output format for ideal compatibility.

A: The speed range is from 0.5x to 5.0x. 0.5x means slowing down to half the original speed, while 5.0x means speeding up to 5 times the original speed. 1.0x is normal speed.

A: No. All audio processing is completed locally in your browser. Files are not uploaded to the server, ensuring your privacy and security.

A: Audio processing consumes a significant amount of memory and CPU resources. It is recommended not to process too many files at once, and each individual file should not exceed 50MB. If you experience lag, refresh the page and process again.

A: Speed adjustment may affect audio quality to some extent, especially with extreme speed changes (such as speeding up by 5x or slowing down to 0.5x). It is recommended to choose a moderate speed multiplier to maintain better audio quality.

A: This tool requires browser support for the Web Audio API. We recommend using a recent version of a modern browser such as Chrome, Firefox, Safari, or Edge. Internet Explorer does not support this feature.