Online Audio Speed Changer

The All-in-One Online Audio Speed Changer is a powerful browser-based audio processing tool designed to meet all your needs for adjusting playback speed, modifying pitch, and converting formats. Without installing any software, you can directly import and process virtually all major audio formats, including MP3, WAV, M4A, FLAC, AAC, OGG, OPUS, and AIFF. Whether you need to slow down English listening materials, speed through long meeting recordings, or create fun voice effects, this tool provides a professional-grade solution directly in your web browser.

Core Speed Adjustment Modes

To cater to various scenarios, the tool features two specialized speed algorithms:

• Smart Speed Mode (Time Stretch):
  The top choice for language learners and audiobook listeners. Using advanced time-stretching algorithms, it allows you to change the playback speed without altering the original pitch. This means even if you speed up audio to 2.0x, voices remain clear and natural without turning into high-pitched "chipmunk" sounds, and slowing down doesn't make them deep and distorted.
• Vinyl / Tape Speed Mode (Pitch Shift):
  This mode perfectly replicates the physical characteristics of traditional cassette players or vinyl records. It links speed and pitch changes together. Speeding up raises the pitch (making the sound higher/thinner), while slowing down lowers the pitch (making the sound deeper). It is ideal for music producers looking for inspiration or video creators making meme or comedic audio content.

Extensive Format Support & Advanced Features

More than just a speed changer, this tool acts as a lightweight audio workstation:

• Broad Format Compatibility: Unlike basic tools that only support MP3, we fully support input and output for M4A (AAC), FLAC (Lossless), WAV, OGG, and more. You can convert rare formats to universal MP3s while adjusting the speed.
• Batch Processing: Drag and drop multiple files at once for processing. The tool includes a one-click "Download All" (ZIP) feature to significantly boost your productivity.
• Volume & Parameter Tuning: Includes a volume booster (up to 300%) to fix quiet recordings. It also supports Stereo/Mono toggling and sample rate adjustments from 8kHz to 96kHz.

Secure, Private, and Convenient

We prioritize your data privacy. This tool operates entirely on the client-side, meaning all audio analysis and processing are performed locally within your web browser. Your files are never uploaded to cloud servers. This ensures the highest level of security for personal recordings or copyrighted music. Available anytime, anywhere, with no registration required, it is the ultimate assistant for your audio processing tasks.