Slow down or speed up any audio file — adjust tempo without changing the pitch
Drop audio file here or click to browse
MP3, WAV, FLAC, OGG, M4A — processed locally, never uploaded
Audio Speed Changer lets you adjust the playback speed of any audio file from 0.25x (4x slower) to 4x faster, while preserving the original pitch. Perfect for language learning, music practice, transcription work, and podcast listening.
A naive speed change also alters pitch — making things sound higher when sped up and lower when slowed down. This tool uses a WSOLA (Waveform Similarity Overlap-Add) time-stretching algorithm to change speed while keeping the original pitch, so voices and music sound natural at any speed.
Drop or select your audio file, choose a speed with the slider or a preset, then click "Apply & Process". The file is decoded with the Web Audio API, time-stretched directly in your browser, and offered as a downloadable WAV. Nothing is uploaded to any server.
Language learning — slow down native speakers to catch every word. Music practice — slow down guitar solos or drum patterns to learn at your pace. Transcription — slow down recordings for accurate typing. Podcasts — speed up to 1.5–2x to listen faster.
Need other edits? Try our Audio Trimmer, Audio Converter, Text to Speech, or Voice to Text.