buncha.tools
buncha/video & audio/audio-speed

Audio Speed Changer

Speed change runs in your browser. Nothing uploads.

Pairs well with

AI Mastering
Auto-master a track by spectral matching it to a g…
Audio Joiner
Combine multiple MP3 / WAV / M4A files into a sing…
Audio Loudness Normalizer
Bring any audio file to a streaming-ready loudness…
Chord & Key Transposer
Transpose guitar/piano chord charts to any key wit…

About Audio Speed Changer

Speed up or slow down any audio file from 0.5× to 2×. Keeps the pitch the same (no chipmunks) so podcasts and audiobooks stay listenable. Optional sped-tape effect if you want it.

Everything happens on your device. Close the tab and it's gone.
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Built browser-first. Run by one developer.
Every tool runs on your device. No tracking pixels, no sign-up to start. The numbers below are pulled live from the registry.
386
Free tools
Across 14 categories
27
AI tools
Powered by Claude API
Files never uploadNo tracking pixelsNo sign-up neededWorks in any modern browser
The handful of AI tools (paraphrase, summarise, blog, captions, etc.) send your prompt text to Anthropic's Claude API to do the work. Files, images, PDFs and video never leave your device. Pick the tools that fit your privacy comfort.