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Audio Trimmer & Fade In / Out

Trim audio locally, adjust fades and volume, select a waveform range and preview before exporting WAV. Channels are preserved; audio is not uploaded.

🔒 Audio is processed locally in your browser, never uploaded or automatically saved. Source files are unchanged. Existing site analytics may record general page usage; download before leaving.

Choose audio or load the demo to start.

Limits: 50 MiB file, 10 minutes, 64 MiB decoded PCM, mono/stereo. A small compressed file can exceed the memory limit. PCM is checked after browser decoding; mobile devices may run out of memory sooner.

Original and processed waveforms

━ Gray: original━ Green: processed

Drag the two handles, use the input fields or the sliders’ arrow keys. The waveform combines channel peaks for display only; audio is not downmixed.

The processed waveform updates instantly with range, fades and volume, showing only the retained clip. This is an approximate thumbnail; preview to check the actual result. Invalid settings hide the overlay.

Playback position: 0.000 s

Trim and effects

Selection length: —

Combined fades must fit within the clip; volume is 0–100%. Selection preview and export use the same processed 16-bit PCM result.

Exports 16-bit PCM WAV only, preserving decoded mono/stereo channels and sample rate. The decoder uses 44,100 Hz and may resample. This is not an MP3 compressor; source metadata is not retained.

Is audio uploaded or automatically saved?

Audio is processed locally in your browser, never uploaded or automatically saved. Source files are unchanged. Existing site analytics may record general page usage; download before leaving.

Which input formats work?

Cannot decode this audio. The format may be unsupported or the file damaged. Existing audio is unchanged. Browser or channel layout unsupported; use mono or stereo audio.

Why is the download WAV only?

Exports 16-bit PCM WAV only, preserving decoded mono/stereo channels and sample rate. The decoder uses 44,100 Hz and may resample. This is not an MP3 compressor; source metadata is not retained.

How do fades and volume work?

Combined fades must fit within the clip; volume is 0–100%. Selection preview and export use the same processed 16-bit PCM result.

Why can a small file exceed the limit?

Limits: 50 MiB file, 10 minutes, 64 MiB decoded PCM, mono/stereo. A small compressed file can exceed the memory limit. PCM is checked after browser decoding; mobile devices may run out of memory sooner.

Are the original sample rate and channels preserved?

Exports 16-bit PCM WAV only, preserving decoded mono/stereo channels and sample rate. The decoder uses 44,100 Hz and may resample. This is not an MP3 compressor; source metadata is not retained.

Replace adjustments that have not been downloaded?

How to use this tool

  1. 1 Choose local audio or the demo and wait for decoding and waveform creation.
  2. 2 Drag the handles or enter start/end seconds, then adjust fades and volume.
  3. 3 Preview the selection, download WAV and reimport it to verify the result.

Common use cases

Trim audio locally, adjust fades and volume, select a waveform range and preview before exporting WAV. Channels are preserved; audio is not uploaded.

Privacy and data handling

Audio is processed locally in your browser, never uploaded or automatically saved. Source files are unchanged. Existing site analytics may record general page usage; download before leaving.

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