音频变速器
更改音频文件的播放速度和节奏
上传音频文件
支持 MP3、WAV、OGG、FLAC、AAC、M4A
使用方法
上传您的文件
拖放文件或点击浏览。您的文件留在浏览器中。
调整设置
配置选项以获得您所需的精确结果。
下载结果
即时处理并下载您的文件——无需等待，无需上传至服务器。
为什么使用此工具
100% 免费
没有隐藏费用，没有付费等级——所有功能完全免费。
无需安装
完全在浏览器中运行。无需下载或安装任何软件。
隐私且安全
您的数据永远不会离开您的设备。不会上传至任何服务器。
支持移动设备
完全响应式设计——在手机、平板或桌面电脑上均可使用。
您的文件保持私密
此工具完全在您的浏览器中处理文件。不会上传至任何服务器——您的数据永远不会离开您的设备。
- 无服务器上传——100% 客户端处理
- 不存储数据——关闭标签页时文件即被丢弃
- 无需账号——无需注册即可立即使用
How Audio Speed and Pitch Shifting Work
Key Takeaways
- Time-stretching changes speed without altering pitch, unlike simple resampling which affects both.
- Common ranges are 0.5x (half speed) to 2.0x (double speed) for practical listening.
- The Web Audio API's playbackRate property enables real-time speed changes directly in the browser.
Changing audio playback speed is useful for studying, transcription, music practice, and content consumption. Modern time-stretching algorithms can speed up or slow down audio while preserving the original pitch, so voices sound natural even at 1.5x speed. This tool processes your audio files entirely in your browser.
1.5×
Optimal study speed
Common Use Cases
Podcast & Audiobook Speed Listening
Listen at 1.25x–1.5x speed to consume more content in less time without losing comprehension.
Music Transcription
Slow down complex passages to 0.5x or 0.75x to hear and transcribe individual notes and chord voicings.
Language Learning
Slow native speaker audio to catch pronunciation details, then gradually increase speed as listening skills improve.
Dance & Choreography
Slow down music to learn complex choreography step by step, then bring it back to full speed as the routine becomes comfortable.
Speed Adjustment Tips
Start with small increments (1.1x, 1.25x) for spoken content. Jumping to 2x drops comprehension significantly.
For transcription, 0.75x is often the sweet spot — slow enough to hear details but fast enough to maintain context.
Export the adjusted file if you want to transfer it to a device that doesn't support variable playback speed.
Pitch-preserved speed change (time stretching) sounds more natural than simple resampling, especially for speech.
All audio processing is performed entirely in your browser. No audio files are uploaded or transmitted to any server.