Audio Speed Changer Online
Speed up speech or slow down musical phrases from 0.5x to 2.0x using time-stretching algorithms. Fast, local browser processing with no pitch degradation.
How do I speed up or slow down an audio file without changing its pitch?
To adjust the tempo of an audio file without altering vocal pitch, upload your track to BrowserConvert's Audio Speed Changer below. Choose a playback speed between 0.5x and 2.0x and click Adjust Speed. Our browser engine utilizes the FFmpeg atempo filter to time-stretch the audio in local device memory, guaranteeing natural vocal tones with zero server uploads.
Select an audio file to change speed
Supports MP3, WAV, M4A, FLAC, OGG, OPUS, AAC
How to Change Audio Playback Speed
1. Upload Track
Select any audio file (MP3, WAV, M4A, etc.) from your device.
2. Pick Tempo
Choose 0.5x, 0.75x (slow), 1.25x, 1.5x (fast), or 2.0x (double speed).
3. Process & Save
Click “Adjust Speed” to process locally and download your time-stretched audio.
Frequently Asked Questions About Audio Speed
Does changing the speed alter the musical pitch (chipmunk effect)?
No. BrowserConvert uses FFmpeg's advanced atempo audio filter, which stretches or compresses the time domain while preserving the original natural pitch, avoiding high-pitched chipmunk or deep demonic distortions.
What speed ranges are supported?
You can adjust playback speed from 0.5x (half-speed, ideal for transcribing speech or learning guitar solos) up to 2.0x (double-speed, ideal for fast podcast or lecture listening).
Can I adjust speed on voice recordings or lectures?
Yes. Simply upload any MP3, WAV, or M4A audio file, select 1.25x, 1.5x, or 2.0x, and download your accelerated audio track for faster listening.