18 browser audio utilities / zero uploads

Free audio tools.
Stay local.

Boost volume, tune or change a voice, generate speech, build a soundboard, add reverb, split stems, and more — 18 free online audio tools that run in your browser. No signup, no software, and no audio uploads.

Open audio lab Browse 18 tools

SOURCE / LOCAL INPUT READY

01 Free to use 02 No signup or install 03 Runs in your browser 04 Files stay on your device

01 / AUDIO LAB

Edit audio in one
browser workbench.

Boost volume, trim a clip, reverse audio, change speed, or generate a tone without switching pages. Preview the result and export a clean WAV.

Local audio labFiles never leave this tab

Source signal0:00

00:00LOCAL BUFFER--:--

Preview controls appear after you add or generate audio.

02 / TOOL INDEX

18 free audio
& voice tools.

Edit and convert audio, clean recordings, separate vocals and stems, transcribe speech, detect BPM, or create responsive music visuals — all on your device.

Volume Booster

Raise loudness with peak-safe gain control and hear the result before exporting.

MP3 · WAV · M4A · OGG

Audio Trimmer

Set precise start and end points on a readable waveform, preview, then export.

MP3 · WAV · M4A · OGG

Reverse Audio

Reverse music, speech, or sound effects locally in one click.

MP3 · WAV · M4A · OGG

Speed & Pitch

Slow down or accelerate a clip with natural linked pitch movement.

MP3 · WAV · M4A · OGG

Create & analyze

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.

Voice input · WAV output

Text to Speech

Generate an English AI voice in your browser and download the result as MP3 or WAV.

English text · MP3 · WAV

Create & analyze

Soundboard

Load, trim, trigger, save, and export a custom soundboard entirely on your device.

12 pads · Keyboard control

Reverb

Add room, hall, plate, or cathedral reverb with an offline browser render.

Room · Hall · Plate · Cathedral

Voice Changer

Create deep, chipmunk, robot, telephone, monster, or custom pitch voices locally.

Five presets · WAV output

Audio Converter

Convert common audio formats without sending the source to a server.

MP3 · WAV · FLAC · AAC

Audio Joiner

Reorder clips, add short crossfades, and export a single clean timeline.

MP3 · WAV · M4A

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.

TXT · SRT · VTT

Create & analyze

BPM Detector

Estimate tempo and display a confidence range for music and loops.

Create & analyze

Music Visualizer

Turn frequency and amplitude data into exportable responsive visuals.

03 / HOW IT WORKS

Edit, preview, and export
in three steps.

01
Choose audio
Open a file from your device. Your browser decodes it directly into memory instead of uploading it to a server.
↳
02
Adjust the result
Use focused controls to cut, boost, convert, clean, separate, analyze, or transform the sound.
⌁
03
Preview and download
Listen before saving, make another adjustment if needed, then download the finished file to your device.
↓

04 / PRIVATE BY DESIGN

Your audio is not our data.

SoundTools has no file upload endpoint. Your browser reads the source, performs the edit locally, and creates the downloadable result on your device.

✓No account or personal profile
✓No media storage bucket
✓No watermark in exported audio

05 / QUESTIONS

About our free audio tools.

Quick answers about privacy, supported formats, local AI, and using SoundTools on mobile.

01Are my audio files uploaded?

No. The included tools decode and process your file inside the browser tab. There is no upload endpoint in this version of SoundTools.

02Which formats can I open and export?

Browser support varies, but common MP3, WAV, M4A, AAC, OGG, and FLAC inputs work across the toolkit. Output choices depend on the tool and include WAV, MP3, FLAC, M4A, WebM, MP4, TXT, SRT, and VTT.

03Do the AI tools upload my audio?

No. RNNoise runs in WebAssembly, while Whisper and Demucs run through local WebGPU inference. Those tools download runtime or model assets, but the selected audio remains inside the tab.

04Does it work on phones?

Yes. The interface adapts to small screens, though very large audio files may exceed the memory available to a mobile browser.