Related tools
What this speed changer offers
- Speed 0.25x–3x — slider plus quick presets
- Keep original pitch — recommended for podcasts and audiobooks
- Pitch shift — ±12 semitones plus cents fine tuning
- Waveform preview — original vs processed, play from cursor
- Batch processing — add multiple files, download all as ZIP
- Output formats — MP3, M4A, WAV, FLAC, OGG, AAC
- Preserve metadata — keep tags and artwork when possible
- A/B comparison — compare original and processed side by side
- No upload — everything runs in your browser
Why change audio speed?
Changing audio speed helps you save time, improve comprehension, and adjust tempo for different needs. For speech, keeping pitch makes fast playback feel more natural. For creative work, pitch shift can produce fun effects.
Best practices
- For podcasts/voice: enable Keep original pitch and use 1.25x–2x.
- For learning: try 0.75x–1x and gradually increase speed.
- If you hear artifacts at extreme speeds, try a smaller speed change or export WAV/FLAC.
- Use A/B comparison to confirm the processed output sounds right before downloading all.
Common use cases
- Podcast listening — speed up episodes without chipmunk voices
- Language learning — slow down difficult passages
- Music practice — slow down tracks to learn parts
- Content creation — create time-stretch or pitch effects
Powered by Web Audio API and optimized processing.
Frequently asked questions
How does audio speed adjustment work?
Speed adjustment changes tempo. With pitch preservation, time-stretching keeps pitch natural while changing speed. Processing runs locally in your browser.
Will changing speed affect audio quality?
Extreme changes can introduce artifacts. For speech, moderate changes (0.75x–2x) typically sound best.
What formats can I export?
You can export to MP3, M4A, WAV, FLAC, OGG, or AAC.
Is my audio secure?
Yes. Files are processed locally and never uploaded.