Audio Speed Changer — Preserve Pitch
Shorten a voiceover, fit narration to a video, or slow down speech while keeping its original pitch. Choose a speed from 0.5× to 2×, process your file in the browser, listen to the result and download a WAV. For example, 33 seconds at 1.10× becomes approximately 30 seconds. Your audio stays on your device; the processing engine downloads on first use. Start with a small change: pitch preservation does not prevent all time-stretching artifacts.
Free to use · No account or login required · No ads
Your media stays private: processed in your browser, never uploaded to our servers.
Choose a file above to get started.
Processing runs entirely in your browser. No file is uploaded anywhere.
Show equivalent FFmpeg command
ffmpeg -i input.mp3 -map 0:a:0 -vn -af atempo=1.1 -c:a pcm_s16le output.wav
Frequently asked questions
How do I speed up audio without changing the voice pitch?
Choose your audio file, set a multiplier above 1 and process it. Pitch-preserving time stretching is applied automatically. Preview the result, then download the WAV. No separate pitch adjustment is needed.
What speed fits a 33-second voiceover into 30 seconds?
Divide the current duration by the target: 33 / 30 = 1.10. Enter 1.10×. Time stretching can leave small timing differences, so check the exported duration when fitting a strict slot.
Can I slow down audio without lowering the pitch?
Yes. Choose a value below 1, down to 0.5×. At 0.5×, playback takes approximately twice as long while the original pitch is preserved.
Is this audio speed changer free and private?
Yes. No account, payment or media upload is required. The processing engine downloads on first use, but your audio is processed locally in your browser. Large recordings can exceed your device memory; try a short file first.
Which audio formats can I use?
MP3, WAV, M4A, AAC, OGG and FLAC inputs are supported, subject to the codec inside the file. The output is an uncompressed WAV, which can be larger than the original MP3. DRM-protected files are not supported.
Will sped-up speech still sound natural?
Pitch stays stable, but a large tempo change can sound rushed or introduce artifacts. Cutting unnecessary pauses or repeated phrases first often preserves a more natural delivery. This tool changes tempo; it does not automatically remove silence or edit your words.