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Multi-format input Speed change without pitch shift WAV export

Audio Format Converter & Speed Changer

Decode MP3, M4A, WAV, OGG and other common audio, resample to WAV with 0.5-2x speed change without altering pitch, fully processed locally.

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Privacy protection: All audio and speech processing happens locally in your browser; audio data is never uploaded to any server.
🎵 Choose audio
Click to choose or drop an audio file MP3 / M4A / WAV / OGG / FLAC and other browser-decodable formats
▶️ Preview (plays at the speed setting)
-Duration
-Sample rate
-Channels
📤 Export

The exported audio duration = original duration ÷ speed, with pitch unchanged.

Technical References

  1. Web Audio API — MDN: https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API

Frequently Asked Questions

Which input formats are supported?

Common formats the browser can decode, such as MP3, M4A, WAV, OGG, and FLAC.

What format is exported?

Standard WAV (PCM), with selectable sample rates of 16000 / 22050 / 44100 / 48000 Hz.

Does changing speed affect pitch?

No. Speed changes are done by resampling, so pitch stays the same; the exported duration equals original duration ÷ speed multiplier.

Is the audio sent to a server?

No. Decoding and conversion happen entirely in your browser.

Technical References

  1. Web Audio API — MDN: https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API