Speed up or slow down audio playback from 0.25x to 4x without changing pitch. Perfect for transcription, music practice, podcast speed adjustment, and audiobook listening.
Speed up or slow down audio playback without changing pitch, or change both speed and pitch together. Drag the speed slider from 0.25x to 4x and hear the result immediately. Great for transcription work, language study, music practice, or fitting audio into a specific time window.
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Generate beautiful waveform visualizations from audio files. Choose from bars, mirror, line, or circular styles. Customize colors and export as PNG.
Detect the tempo (BPM) of any audio file. Includes tap tempo feature and genre reference guide.
Trim, cut, and slice audio files with interactive waveform visualization. Drag handles to select portions, use keyboard shortcuts, zoom and pan, preview selection before export. Supports MP3, WAV, OGG, AAC.
A lecture recording is too slow to review and you want 1.5× without chipmunk pitch.
Input
lecture.mp3 · 1.5× · preserve pitch
Output
A 1.5× file at the original pitch, natural voice, shorter runtime
Time-stretching changes duration without resampling, so the pitch stays natural instead of rising like a sped-up tape. Decoupling speed from pitch is exactly what makes faster review listenable.
Speed up or slow down audio playback without changing pitch, or change both speed and pitch together. Drag the speed slider from 0.25x to 4x and hear the result immediately. Great for transcription work, language study, music practice, or fitting audio into a specific time window.
Slow down fast speech to catch every word while typing.
Reduce playback speed on foreign-language audio to better follow pronunciation.
Slow a difficult passage down to practice at a comfortable tempo before building back up.
Speed up a voiceover slightly to fit a fixed video duration without re-recording.
With pitch preservation enabled, the pitch stays the same regardless of speed. With it disabled, pitch rises when sped up and drops when slowed down, like a tape machine.
Time-stretching algorithms introduce artifacts at very low or very high ratios. Staying within 0.5x-2x produces the cleanest results.
This tool applies a uniform speed change. To adjust only a section, trim it first, change speed, then merge it back.
Audio is decoded and processed locally with the Web Audio API. Your files are never uploaded to a server.