Precise WAV cuts, with clear limits.

What this tool does

Choose exact sample boundaries, apply gain and linear fades, preview the result and export a new WAV. The end sample is exclusive: start 100 and end 200 exports 100 samples per channel. The input is not resampled. Browser playback can use a different device sample rate.

Supported input: little-endian RIFF WAV, mono or stereo, PCM 16-bit, PCM 24-bit or IEEE float 32-bit, from 8,000 to 192,000 Hz. Maximum 64 MB and ten minutes. Compressed WAV, extensible WAV, MP3 and other formats are not supported. Choose 16-bit PCM, 24-bit PCM or 32-bit float WAV for export.

This is not bit-for-bit or metadata-preserving editing. Audio is processed as floating-point samples. Export rewrites the WAV and does not copy tags, markers or other metadata. Fades are linear; overlapping fades multiply. Samples beyond full scale are clipped and counted. Integer exports are rounded with no dither. Keep the original file.

Privacy

The app reads the file you choose and processes its samples in this browser. This build has no upload feature, analytics scripts, tracking cookies or audio storage. Preview uses the device's audio output. Downloaded copies are saved by your browser. Hosting infrastructure handles requests to serve the app; this page makes no claim about hosting logs. Other browser extensions or software are outside this app's control.

Open-source attribution

The WAV writer is adapted from AudioMass src/wav.js at commit 21f5ee1362a47be6f0dbe6e4969a15e43d21b044, copyright (c) 2018-present Pantelis Kalogiros, MIT licensed. Read the actual upstream licence and component notice.

This focused tool does not include the AudioMass editor, its icon fonts, MP3/FLAC encoders, RNNoise or LZ4. Changes: module export, attribution and RIFF odd-data padding fix for the WAV writer; a new bounded WAV parser, sample-range/effect processing, background-worker export, waveform selection and responsive interface. There are no third-party runtime dependencies besides the attributed WAV writer.

Download the source and licence. New Chawso code is distributed under the same MIT terms.

Revised November 13, 2026. Contact: [email protected].