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
44 tools, one local principle
01 / GAIN↗02 / CUT↗03 / REV↗04 / RATE↗05 / HZ↗06 / TUNE↗07 / TTS↗08 / PAD↗09 / VERB↗10 / VOICE↗11 / FMT↗12 / JOIN↗13 / DENOISE↗14 / STEM↗15 / 4×↗16 / TXT↗17 / BPM↗18 / VIS↗19 / EQ10↗20 / 8D↗21 / BASS↗22 / NIGHT↗23 / NREV↗24 / SLOW↗25 / FAST↗26 / CLIP↗27 / VAPOR↗28 / CLONE↗29 / V2I↗30 / SONG↗31 / COVER↗32 / TAGS↗33 / PITCH↗34 / TEMPO↗35 / V2A↗36 / BEAT↗37 / GRAIN↗38 / HEAR↗39 / REC↗40 / MIC↗41 / NORM↗42 / COMP↗43 / FADE↗44 / SPLIT↗
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 WAV or MP3.
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.
Autotune
Correct a monophonic vocal toward a chromatic, major, or minor scale without uploading it.
Text to Speech
Generate an English AI voice in your browser and download the result as MP3 or WAV.
Soundboard
Load, trim, trigger, save, and export a custom soundboard entirely on your device.
Reverb
Add room, hall, plate, or cathedral reverb with an offline browser render.
Voice Changer
Create deep, chipmunk, robot, telephone, monster, or custom pitch voices locally.
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.
Audio Equalizer
Use a 10-band equalizer with practical presets, A/B comparison, and peak-safe local export.
8D Audio
Create a stereo orbit with adjustable cycle, depth, and optional room reverb.
Bass Booster
Boost 60–250 Hz with a low-shelf filter and automatic peak protection.
Nightcore Maker
Apply the familiar linked speed-and-pitch effect with a clear 1.05×–1.5× rate control.
Nightcore Reverse
Build a linked Nightcore edit and reverse the finished sample timeline locally.
Slowed + Reverb
Slow audio with linked lower pitch, then blend an adjustable algorithmic reverb.
Sped Up Audio
Speed up audio from 1.05× to 2× with pitch preservation on by default.
TikTok Slowed Audio
Slow a local file, choose a 15, 30, or 60 second section, and add clean fades.
Vaporwave Maker
Combine linked slowdown, low-pass color, reverb, and adjustable wow/flutter.
Voice Cloning
Generate a short, watermarked speech sample from an authorized reference voice using local WebGPU inference.
Voice to Instrument
Track a monophonic voice, quantize its notes, and render piano, guitar, strings, or synth locally.
Speech to Song
Quantize a short spoken phrase into a key and add a simple local accompaniment.
FLAC Cover Art
Preview, replace, or remove FLAC cover art while copying the audio stream without re-encoding.
Audio Metadata Editor
Read and update title, artist, album, date, track, genre, comment, and cover art locally.
Pitch Shifter
Shift audio by semitones while preserving the original duration with a local FFmpeg filter chain.
Tempo Changer
Slow down or speed up audio from 0.5× to 2× while keeping musical pitch stable.
Video to Audio
Convert a local video file into MP3, WAV, FLAC, or M4A without a URL downloader or upload.
Beat Maker
Build six-track drum patterns with swing, velocity, mute, solo, and local audio export.
Granular Synthesizer
Resynthesize a local sample with grain size, density, position, spray, pitch, reverse, filter, and reverb controls.
Hearing Test
Check relative left and right audibility from 250 Hz to 8 kHz with safe calibration and a results chart.
Audio Recorder
Record a microphone locally with a live level meter, pause and resume, private preview, and WAV or MP3 download.
Microphone Test
Check a microphone with live dBFS level, peak headroom, waveform, device diagnostics, room-noise measurement, and a local playback sample.
Audio Normalizer
Measure Integrated LUFS, RMS, and sample peak, then normalize locally with an adjustable peak ceiling.
Audio Compressor
Shape dynamic range with threshold, ratio, attack, release, soft knee, and makeup gain, then export WAV or a smaller MP3.
Fade In / Fade Out
Set separate fade-in and fade-out times, choose musical curve shapes, preview the envelope, and export locally.
Split Audio
Divide audio into equal parts, fixed intervals, or custom timecodes, preview every segment, and download individual files or one ZIP.
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.