Audio Speed Changer — Speed Up or Slow Down Any File
Drop your audio file here
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Choose fileMP3, WAV, OGG, FLAC, M4A · Max 50 MB
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Decoding audio...
Extreme speeds may reduce audio quality.
What is Audio Speed Changing?
Audio speed changing lets you play any audio file faster or slower than its original tempo. Podcast listeners speed up episodes to 1.5× to get through more content. Musicians slow down fast guitar solos to learn them note by note. Students play back lectures at 1.25× to save study time. Transcribers slow audio to 0.75× to catch every word.
Our speed changer gives you precise control from 0.25× (quarter speed) to 3× with presets for common speeds. Unlike dedicated pitch shifting where you think in semitones, here you think in playback rate — 1.5× means 50% faster, 0.5× means half speed.
How to Change Audio Speed
- Upload your audio — drop an MP3, WAV, OGG, FLAC, or M4A file (up to 50 MB).
- Choose your speed — pick a preset like 0.5× Half speed or 2× Double speed, or use the slider for any speed between 0.25× and 3×.
- Preview and export — hit play to hear the speed change live, then export as a 320 kbps MP3.
Change Speed Without Changing Pitch
Our speed changer preserves the original pitch at any speed. Whether you're speeding up a podcast to 1.5× or slowing down a guitar solo to half speed, voices and instruments sound natural — no chipmunk effect, no deep rumble. This is achieved using a time-stretching algorithm that adjusts tempo independently of pitch.
If you want to change pitch without affecting speed, check out our Pitch Shifter which also preserves duration. For the classic slowed-down aesthetic where pitch and speed change together, try Slowed + Reverb.
Best For
Podcast listeners who want to get through episodes faster without missing content. Students reviewing recorded lectures at higher speed to save study time. Transcribers who slow audio down to catch every detail. Musicians practicing along with slowed-down recordings to learn complex passages. Language learners who slow down native speech to improve comprehension.
Frequently Asked Questions
Does changing speed also change pitch?
No. Our speed changer uses time-stretching to adjust speed while keeping the original pitch. Voices and instruments sound natural at any speed from 0.25× to 3×.
Can I change speed without changing pitch?
Yes — pitch is preserved at any speed from 0.25× to 3×. The time-stretching algorithm adjusts tempo independently of pitch.
What's the fastest and slowest speed?
You can slow audio down to 0.25× (quarter speed) or speed it up to 3× (triple speed). The slider lets you set any value in between with 0.05 precision. The presets cover the most common speeds from 0.5× to 2×.
What's the best speed for podcasts?
Most people find 1.25× to 1.5× comfortable for podcasts and audiobooks. Pitch stays natural at any speed. Start with 1.25× and work your way up — your brain adapts quickly. Beyond 2× it becomes hard to follow speech clearly.
What audio formats are supported?
MP3, WAV, OGG, FLAC, M4A, AAC, and WebM. The output is always a 320 kbps MP3 file.
Is my audio uploaded to a server?
No. All processing happens locally in your browser using the Web Audio API. Your files never leave your device.
How good is the audio processing quality?
We use the same techniques found in professional audio software: convolution reverb with real impulse responses, phase vocoder time-stretching, HRTF-based spatial audio, EBU R128 peak limiting, and LUFS loudness normalization. What you hear in the preview is exactly what you get in the export — we guarantee preview/export parity across every tool.