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免费 Audio Speed Changer
Speed up or slow down audio with the pitch preserved (great for podcasts) or shifted. Export as MP3. Runs entirely in your browser, no upload.
无文件大小限制文件保持私密无需登录永久免费
将文件拖放到此处或点击浏览
MP3, WAV, FLAC, OGG, AAC, M4A, Audio 无文件大小限制
你的文件永远不会离开你的设备。所有处理都在你的浏览器中本地进行。
Speed up or slow down audio — keep the natural pitch (great for podcasts and audiobooks) or shift the pitch. Runs entirely in your browser.
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工作原理
Changing audio speed can either keep the pitch natural (so a sped-up voice doesn't sound like a chipmunk) or shift it (the classic record speed-up). This does both with FFmpeg in your browser.
- 1FFmpeg.wasm loads onceThe WebAssembly build downloads on first use and is cached afterwards.
- 2You pick a speed and pitch modeFrom 0.5× to 3×, with "keep natural pitch" on or off. The file stays in your browser.
- 3FFmpeg re-times the audioNatural-pitch mode uses chained atempo filters (time-stretch); pitch-shift mode uses asetrate (speeds and pitches together).
- 4Download the MP3The result is encoded to MP3 and previewed with the built-in player.
Speed up a podcast or audiobook, or make a "slowed + reverb"/"nightcore" edit, entirely on your device — nothing is uploaded.
为什么选择我们的？
✓Completely free — no hidden costs, ever
✓No account, email, or login required
✓Files stay on your device — processing happens in your browser
✓Works on any device — phone, tablet, desktop
✓No watermarks on any output
✓Browser memory limits may apply for very large files
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