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無料 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.
ファイルサイズ制限なしファイルはプライベートのままログイン不要永遠に無料
ファイルをここにドロップするか、クリックして選択
MP3, WAV, FLAC, OGG, AAC, M4A, Audio ファイルサイズ制限なし
ファイルがデバイスを離れることはありません。すべての処理はブラウザ内でローカルに行われます。
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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使い方
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.
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✓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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