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ConvertBox

Audio Cutter

Trim audio files to extract a specific clip. Set start and end time to the millisecond, supports MP3/WAV/FLAC/AAC up to 100MB — processed locally.

How to Use

  1. Select an audio file to cut (MP3, WAV, FLAC, AAC, M4A, or Ogg — up to 100MB)
  2. Play the waveform to preview the track and locate the section you want
  3. Drag on the waveform to create a selection, then drag the handles for fine adjustment
  4. Zoom in for precise, millisecond-level start and end points
  5. Use "Cut" to keep only the selection, or "Remove" to delete it and keep the rest
  6. Choose the output format (MP3, WAV, or AAC) and click "Save"
  7. The trimmed file is processed in your browser and downloads instantly

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

Yes, you can drag on the waveform to select the desired section and fine-tune start/end times.
You can either extract the selected section or remove it and keep the rest.
Yes, the tool supports undo and redo operations for your edits.
If cutting fails: (1) use a file under 100MB, (2) verify the selected range is within the actual audio duration, (3) convert to MP3 first for best compatibility, (4) refresh the page and retry.
No. Cutting is performed locally via FFmpeg.wasm — your file stays on your device.
For supported formats (MP3, AAC), cutting is stream-copy and lossless. Other formats may be re-encoded with minimal quality impact.
Yes. Set multiple start/end ranges; each segment is exported separately or merged into one output.
No. All operations are processed entirely inside your browser's local sandbox using client-side APIs (like WebAssembly, pdf-lib, or HTML5 Canvas). Your files and data never leave your device.
The tool is completely free with no usage limits. However, since processing occurs in your browser's memory, we recommend keeping file sizes under 50MB (especially for heavy files like PDFs or videos) to ensure stability.
No. All tools on ConvertBox are 100% free. We do not insert watermarks, limit features, or require any registration or payment.
Yes. Once the page and its local library dependencies are loaded in your browser, the conversion logic runs completely offline without needing an active internet connection.

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