How do I change the speed of a song or podcast without changing pitch?

Upload your audio track, adjust the tempo multiplier (from 0.5x slow to 2.0x fast), and export your retimed track with pitch correction.

Can I practice music or transcribe speech with the speed changer?

Yes. Slow down complex instrumental solos or fast speech to 0.75x or 0.5x for easy transcription and rehearsal.

NexLove Media

Audio Speed & Tempo Controller Studio

TL;DR: Audio Speed & Tempo Controller Studio is a 100% free browser-based media utility. Adjust playback tempo from 0.25x to 4.0x with real-time waveform visualization and pitch preservation.

Select Audio or Drag & Drop

Supports MP3, WAV, OGG, AAC, M4A, FLAC (100% private in-browser)

Understanding Audio Speed & Tempo Controller Studio

Speed up or slow down audio playback rate from 0.25x up to 4.0x. Adjust podcasts, voice notes, and music tracks with interactive waveform scrubbing, pitch preservation, and instant lossless WAV export. Designed for creators, video editors, audio engineers, web designers, and developers who need instant, high-precision processing without software installation, watermarks, or file uploads.

Mathematical Formula & Technical Methodology

T_{\text{out}} = \frac{T_{\text{in}}}{\text{TempoMultiplier}}, \quad \Delta T = T_{\text{in}} - T_{\text{out}}

Formula Variables Explained:
Resamples PCM sample arrays or time-stretches audio frames according to the requested playback tempo multiplier.

Step-by-Step Worked Example

A 60-second voice note at 1.5x speed renders into a 40-second audio track, saving 20 seconds of listening time.

100% Client-Side Privacy Guarantee

All media decoding, manipulation, calculations, and encoding execute locally inside your web browser using HTML5 Canvas, Web Audio API, WebCodecs, Web Crypto, and modern JavaScript engines. Zero server uploads, zero telemetry, and no registration required.

Frequently Asked Questions

: Upload your audio track, adjust the tempo multiplier (from 0.5x slow to 2.0x fast), and export your retimed track with pitch correction.
: Yes. Slow down complex instrumental solos or fast speech to 0.75x or 0.5x for easy transcription and rehearsal.

Embed This Tool

Add the live Audio Speed & Tempo Controller Studio to your own website with this embed code:

<iframe src="https://nexlove.org/embed/audio-speed-changer.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="Audio Speed & Tempo Controller Studio — NexLove" loading="lazy"></iframe>

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