Free Online Audio Tools

Fourteen free audio utilities for anyone making music, especially with AI. Find the BPM or key of a track, remove vocals, split stems, trim, convert, compress, join, reverse or transpose a file — all of it running locally in your browser. Nothing is uploaded, no account is required, and no output is watermarked, which is what makes these safe to use on unreleased material.

Nothing leaves your device

Every tool here (except the AI prompt generator) processes audio locally in your browser using the Web Audio API — your files are never uploaded to a server. That matters when you are working with unreleased tracks.

Everyday essentials

Convert, compress & combine

Inside

What the toolkit covers

Fourteen utilities, all running in the browser with nothing uploaded.

Find the tempo of anything

Drop in a track and read its BPM, or tap it out by hand. The two methods disagree in useful ways on swung material.

Open the tool Start free

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Why this exists

Why the tools are free and local

Every one runs on your machine. That is a design decision, not a limitation.

Generate music for free

Your audio never leaves the device
Unreleased work should not be uploaded to check its tempo. Web Audio does the analysis in the tab, so nothing is transmitted.
No account, no watermark
A utility that asks for an email before telling you a BPM is not a utility. There is no signup and no branding baked into exports.
Instant, and works offline
No round trip means no queue and no rate limit. Once the page has loaded, the tools keep working without a connection.
The method is published
Each tool explains how it actually works, so you can judge when to trust it and when to check by ear.

Who it's for

Who uses the toolkit

Producers

A quick answer mid-session without opening a project.

DJs

Checking tempo and key before a track goes in a set.

Video editors

Preparing audio to sit under a cut.

Students

Watching the numbers change is how the theory sticks.

Browse

Every tool

Pick the one that answers your question.

Audio metadata viewer

Audio converter

Frequently asked questions

Are these audio tools really free?

Yes. Every tool here runs in your browser with no account, no upload and no watermark on the exported file. There is no paid tier for the tools themselves.

Do my files get uploaded anywhere?

No. Every tool except the AI prompt generator processes audio locally using the Web Audio API, so files never leave your device. That is what makes them safe for unreleased material.

What audio formats do the tools support?

MP3, WAV, M4A, AAC, OGG and FLAC — anything your browser can decode. Exports target the common delivery formats.

Which tool finds the BPM of a song?

The BPM finder measures the rhythmic pulse of any file and returns a tempo estimate in a couple of seconds. Pair it with the key finder when you need both numbers for harmonic mixing.

How do I remove vocals from a song?

The vocal remover cancels the centre channel, where lead vocals sit in most commercial mixes. If keeping the bass and kick matters, use the stem splitter instead, which separates by source rather than by position.

Do these tools work on a phone?

They work in any modern mobile browser, though large lossless files are limited by device memory rather than by a server quota.

Is there a file size limit?

The practical limit is your device memory, because processing happens locally. There is no queue and no upload cap.