0.5x–3x · Corrected Pitch · Free · No Upload
Speed Up Audio Online — 1.5x, 2x, and 3x Without Changing the Voice
Speed up (or slow down) any audio with automatic pitch correction, right in your browser. Free and private.
100% local processing: your file never leaves your device. Once the page loads, it even works offline.
Supported formats:Files .mp4 up to 300 MB — processed locally · Video and virtually any audio format are also accepted — we extract the audio automatically.
How it works
- 01
Upload the audio
Any common format (MP3, OGG, M4A, WAV...), up to 300 MB.
- 02
Choose the speed
From 0.5x (slower, for transcribing by ear) up to 3x (quick review). The pitch is corrected automatically — the voice stays natural.
- 03
Download the adjusted audio
The MP3 with the new speed is ready in seconds.
Frequently asked questions
Why speed up audio online?
Listen to podcasts, audiobooks, and long WhatsApp audios at 1.5x or 2x without installing anything — the pitch is corrected automatically (no cartoon voice).
What if I need the text of that audio?
After converting, you can transcribe the file with AI on VoxScriber: 30 free minutes per month, with automatic punctuation and speaker identification. Ideal for WhatsApp audios, meetings, and interviews.
Is the Speed Up Audio Online really free?
Yes, free and unlimited. Processing happens in YOUR browser (WebAssembly), so we have no server cost — and you don't need to create an account.
Is my file sent to any server?
No. All processing is local (FFmpeg compiled to WebAssembly running on the page). The file never leaves your device — it even works offline after the page loads.
Is there a size or quantity limit?
The limit is 300 MB per file (browser memory). There is no limit on the number of uses. For larger files, VoxScriber processes on the server with uploads up to 5 GB.
Does it work on mobile?
Yes — any modern browser (Chrome, Safari, Firefox, Edge) on desktop or mobile. On older phones, large files may take longer.
Need the text of this audio? Transcribe with AI — 30 min free
Create free account →30 minutes/month free. No credit card required.