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Speed up or slow down audio files without changing pitch. Good for podcasts, lectures, and music practice.
Adjust audio tempo from 0.5x (half-speed) up to 2.0x (double-speed) without introducing the unnatural "chipmunk" high-pitch effect using phase-vocoder DSP algorithms.
WSOLA phase-vocoder preservation keeps pitch 100% natural.
Transpose backing tracks and vocal stems without speeding up or slowing down rhythm.
How to Use
Select lectures, audiobooks, podcasts, or music tracks to accelerate or decelerate.
Choose your target tempo (e.g. 1.25x or 1.5x) with phase-vocoder pitch locking to preserve natural human voice tone.
Download your accelerated or slowed audio track with zero pitch distortion.
Accelerated Audio Ready
15 Minutes Saved
How to Make Custom Phone Ringtones
Audio engineering guide: slice songs into clean 30s ringtones for iPhone (M4R) and Android (MP3) with zero-crossing cuts and seamless loop fades.
How to Make Custom Ringtones
Yes. Our audio speed changer uses phase vocoder time-stretching algorithms that adjust the playback tempo from 0.5x up to 2.0x while locking the pitch to its original key. Speech stays natural and intelligible even at 1.5x or 1.75x speed.
Slowing down audio (0.7x – 0.85x) is ideal for transcribing fast interviews, learning musical instrument solos by ear, or language pronunciation practice. Speeding up audio (1.25x – 1.5x) helps students and professionals consume lectures and podcast episodes faster.
Yes. When you speed up an audio file, its total duration decreases proportionally, which results in a smaller final file size when exported at the same bitrate.
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A complete step-by-step guide to trimming song choruses into seamless 30-second ringtones for iPhone (M4R) and Android (MP3) with zero-crossing cuts and smooth loop fades.