How do I slow down audio for practice or transcription?

Choose an audio file, set a speed from 0.25x to 4x, and listen to the preview. Try 0.75x for speech or music practice, or 1.5x to listen faster. Export to save the speed change in a new file.

Which output formats can I download?

You can export MP3, WAV, or M4A audio.

Is my audio uploaded to a server?

Files selected from your device are processed locally in your browser. Keep the tab open until export finishes, then download the result. Large files can exceed your device memory.

Does changing speed affect pitch?

The exported audio keeps its original pitch while its duration changes. Very slow or fast settings may still introduce audible artifacts. Preview and check the exported result before replacing any original file.

Browser audio tool

Audio Speed Changer

Local processingLive previewPitch preserved

Speed up or slow down MP3 and other audio from 0.25x to 4x in your browser. Preview the result, preserve pitch for more natural voices and music, and export MP3, WAV, or M4A without uploading.

Source audio

Drop a file here, or click to choose

How it works

Three steps to finish the browser workflow.

1
Choose audio
Speed up or slow down MP3 and other audio from 0.25x to 4x in your browser. Preview the result, preserve pitch for more natural voices and music, and export MP3, WAV, or M4A without uploading.
2
Playback speed
Choose a common tempo preset from 0.25x to 4x.
3
Change speed
Choose an MP3 or other audio file and a speed. ArtPlayer processes it locally in your browser with FFmpeg atempo, then exports a new MP3, WAV, or M4A file.

Everything you need

Core details about privacy, browser support, output, and practical limits before you start.

Local processing

The audio is processed locally in this browser with FFmpeg and is not uploaded.

Preview tempo

The source preview follows the selected speed before export.

Pitch-aware tempo

FFmpeg atempo changes duration while keeping voices and music more natural.

Input, output and limits

Check supported inputs, output formats and usage requirements before you start.

Supported input	Audio files such as MP3, WAV and M4A. Supported codecs depend on the browser and processing runtime.
Output result	Export options: MP3 / WAV / M4A.
Processing and privacy	Processing runs on this device. Source media is not uploaded for this workflow.
Browser requirements	A browser with the decoding and encoding capabilities needed by the selected media. Available codecs vary by device.
Usage limits	Processing capacity depends on duration, dimensions, codecs, settings and available device memory. Large inputs can fail; keep the original file.
Does changing speed affect pitch?	The exported audio keeps its original pitch while its duration changes. Very slow or fast settings may still introduce audible artifacts. Preview and check the exported result before replacing any original file.