Audio Tools
Audio Speed Changer
Speed up or slow down audio from 0.25x to 4x with pitch preservation option.
Your files stay on your device - processed locally via WebAssembly, never uploaded
Drop audio file or click to upload
MP3, WAV, OGG, FLAC, AAC, M4A
🔒 Your audio files are processed in your browser. Nothing is uploaded.
Embed this tool on your website
Copy this code to add the Audio Speed Changer to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/audio-speed" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Audio Speed Changer by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/audio-speed">OptiPix Audio Speed Changer</a></p>
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About Audio Speed Changer
Last updated: May 2026
OptiPix 音频变速器可让您直接在浏览器中将任何音频文件的播放速度从 0.25 倍（四分之一速度）调整到 4 倍（四倍速度）。选择保留音高（时间拉伸以获得自然声音）或允许音高变化（高速时发出花栗鼠声，低速时发出低沉声音）。预设常用值的速度按钮。导出为 MP3、WAV、OGG、FLAC 或 AAC。使用 FFmpeg.wasm 的 atempo 滤镜进行高质量时间拉伸。
How It Works
该工具使用 FFmpeg.wasm 的 atempo 滤镜进行保留音高的速度更改（在 0.5-2.0 范围之外的速度需要链接多个 atempo 实例），或使用 asetrate/aresample 进行带音高变化的变速。
Use Cases
- •加快播客收听速度
- •放慢音乐以便练习
- •加快讲座录音
- •创建慢动作音频效果
- •调整有声读物的播放速度
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If you find Audio Speed Changer useful, check out these related tools: Audio Trimmer, Audio Volume Booster, and Audio Effects. All tools run entirely in your browser with no uploads or signups required.
Explore more: Browse all tools · Step-by-step guides · Tips & tutorials · Compare tools
Frequently Asked Questions
我能保留音高吗？
支持的速度范围是多少？
我的音频会被上传吗？
音高保留是如何工作的？
支持哪些格式？
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