Convert stereo to averaged mono, extract left or right, swap channels, duplicate mono to stereo and invert polarity locally.
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Up to 128 MiB per file; decoded audio up to 256 MiB (about 23 min mono / 11½ min stereo). Formats depend on your browser's decoder. Working audio and WAV exports use 48 kHz.
Choose audio to begin. Nothing plays automatically.
No audio loaded
Your waveform will appear here.
Load audio to choose a section.
Click the waveform to seek, or use the adjacent transport and exact time controls. Settings apply live. This is the original source waveform. No tail is appended. Review the processing notes and generate the actual WAV before downloading.
Playback stopped.
Uncheck to compare original decoded audio. Exports always use selected settings.
Exact fields remain usable when a quick slider cannot represent a fine value.
The original file stays unchanged.
Mono mix is (L+R)/2, not a sum or loudness normalization; opposite-polarity content can cancel. Polarity applies to source channels before routing. Right extraction, swapping and right-only inversion require stereo. Mono duplication creates identical L/R, not new stereo detail. Extracted mono is duplicated only for monitoring; the file remains mono.
Create a WAV to preview the actual result.
WAV | selected channel count and sample rate. Review the output plan before exporting. Input up to 128 MiB; source/output float buffers each up to 256 MiB, subject to device memory. Final PCM clipping is counted. Tags/artwork are omitted. Settings changes clear exports; Stop terminates the local worker. No source or settings are sent to a server.
Your audio is never uploaded to any server. Decoding, effect processing, playback and WAV encoding run locally with self-hosted code. Source files stay unchanged, with no account or audio history.
Mono mix is (L+R)/2, not a sum or loudness normalization; opposite-polarity content can cancel. Polarity applies to source channels before routing. Right extraction, swapping and right-only inversion require stereo. Mono duplication creates identical L/R, not new stereo detail. Extracted mono is duplicated only for monitoring; the file remains mono.
Settings are delivered to the playing local AudioWorklet without restarting the source. Continuous controls use short smoothing transitions; discrete routing or direction changes may click. Exports apply current fixed settings, not a recording of knob movements. Original comparison affects monitoring only.
Duration follows the original apart from output sample rounding, with at least one output frame and no appended tail. Channel and sample-rate choices are explicit in the output plan. The converter supports 16-bit PCM, 24-bit PCM and 32-bit float WAV; other tools export 48 kHz 16-bit PCM WAV. Tags/artwork are omitted. The actual encoded player and waveform must load before download enables.
Seeking uses the original timeline. Current fixed routing settings apply at the selected cursor; smoothing during live edits is not recorded in exports.
One mono/stereo file up to 128 MiB, decoded at 48 kHz within a 256 MiB float budget. Output has its own 256 MiB float budget; device memory may impose lower limits. Browser decoder support varies. Live AudioWorklet needs HTTPS or localhost and a supported browser. Stop/edit/clear/replacement terminates export and discards obsolete results.
