Local by architecture
Audio decoding, sample processing, preview creation, and WAV export happen in your browser. There is no hidden media upload step in the current application.
Useful audio work.
Nothing to hand over.
SoundTools is a focused set of browser audio utilities. The goal is simple: make one real change to a recording, hear the result, and save it without sending the source file to someone else's server.
THREE OPERATING PRINCIPLES 01 02 03
Working before listed as live
Every tool page opens on its real input and controls. Heavy model tools state their download and WebGPU requirements before work begins.
Limits belong in the guide
Peak-safe gain is not loudness normalization. Variable speed is not pitch-preserving time stretch. Publishing those distinctions helps people choose the right tool.
AVAILABLE TODAY
Thirteen tools, one local principle
01 / GAIN↗02 / CUT↗03 / REV↗04 / RATE↗05 / HZ↗06 / FMT↗07 / JOIN↗08 / DENOISE↗09 / STEM↗10 / 4×↗11 / TXT↗12 / BPM↗13 / VIS↗
Volume Booster
Raise loudness with peak-safe gain control and hear the result before exporting.
Audio Trimmer
Set precise start and end points on a readable waveform, preview, then export.
Reverse Audio
Reverse music, speech, or sound effects locally in one click.
Speed & Pitch
Slow down or accelerate a clip with natural linked pitch movement.
Tone Generator
Create sine, square, triangle, or saw tones from 20 Hz to 20 kHz.
Audio Converter
Convert common audio formats without sending the source to a server.
Audio Joiner
Reorder clips, add short crossfades, and export a single clean timeline.
Noise Remover
Reduce room noise, hiss, and low-level background texture in recordings.
Vocal Remover
Create instrumental and vocal stems using an on-device separation model.
Stem Splitter
Separate vocals, drums, bass, and instruments into individual tracks.
Speech to Text
Transcribe interviews, voice notes, and lectures with local-first speech recognition.
BPM Detector
Estimate tempo and display a confidence range for music and loops.
Music Visualizer
Turn frequency and amplitude data into exportable responsive visuals.
WHAT “LOCAL” MEANS
The browser is the workshop
- 01
Read
You choose a compatible audio file. Browser APIs read it directly into memory and decode its channels and sample rate.
- 02
Process
Browser workers, WebAssembly, Web Audio, or WebGPU perform the requested edit, analysis, transcription, or separation without sending sample data to an application server.
- 03
Preview and export
The page creates temporary local previews and the output files advertised by that tool. Closing the tab releases those in-memory results.