Free Online Audio Tools

Free online audio tools that run entirely in your browser — convert, trim, boost and reverse audio, plus text to speech. No sign-up, no watermark. Every tool runs on your own device with ffmpeg (WebAssembly), so your files are never uploaded.

Convert & trim audio

Text to Speech

Read any text aloud with natural browser voices — adjustable rate, pitch and volume.

Audio Converter

Convert between MP3, WAV, M4A, FLAC and Opus with bitrate control.

Audio Cutter & MP3 Trimmer

Cut a section from an MP3, WAV, M4A, FLAC or OGG by start and end time — lossless, keeps the format.

Convert to MP3

M4A to MP3

Convert Apple M4A / AAC audio to a universal MP3, with bitrate control.

WAV to MP3

Compress large lossless WAV recordings into small, shareable MP3s.

FLAC to MP3

Turn lossless FLAC music into MP3 that plays on any device.

Video to MP3

Extract the audio from an MP4, MOV, WebM or MKV and save it as MP3.

Edit & effects

Volume Booster

Make a quiet track louder by a chosen number of decibels, saved as MP3.

Reverse Audio

Flip any sound to play backwards — great for effects and backmasking.

Private, in-browser audio conversion

Most online audio converters upload your file to a server, queue it, watermark it, or cap the file size. These don’t. The moment the page loads, everything happens locally: you pick a file, it’s read straight into an audio engine running inside your browser tab, and the converted result appears for download — the audio data never leaves your device. That makes these tools safe for voice memos, recordings and work files, and it means there is no upload wait and no sign-up.

Under the hood every tool runs ffmpeg compiled to WebAssembly (ffmpeg.wasm) — the same engine behind most desktop audio software, running as code inside your browser rather than on a remote machine. That is what lets the Audio Converter move between real formats — MP3, WAV, M4A (AAC), FLAC and Opus, reading most others including OGG and AIFF — instead of just renaming a file. The MP3 Cutter & Trimmer copies the audio stream between two points with no re-encode, so a trimmed clip is bit-for-bit identical to the original.

Because the whole pipeline is client-side JavaScript and WebAssembly, there is nothing to install, no extension to add and no key to paste — open a tool, drop in a file, and download the result. The first conversion in a session loads the ffmpeg engine, so it may take a few seconds; after that, repeat conversions are quick. Everything is free, private and works on desktop, tablet and mobile, with the only real limit being the memory available on the device doing the work.

Frequently Asked Questions

Are these audio tools free?

Yes — every audio tool here is free. The whole suite works with no account, no payment and no usage cap. There is no watermark on the output and no daily limit on how many files you convert or trim.

Is my audio uploaded anywhere?

No — your audio never leaves your device. All conversion and trimming happens locally in your browser using ffmpeg compiled to WebAssembly. Your file is read straight into the page and processed on your own device — the audio data is never uploaded to a server, so it is safe for voice memos, recordings and work files.

What audio formats are supported?

The Audio Converter converts between MP3, WAV, M4A (AAC), FLAC and Opus, and reads most other formats ffmpeg can decode, including OGG and AIFF. The Audio Cutter trims MP3, WAV, M4A, FLAC and OGG losslessly, keeping the original format. Video to MP3 accepts a video file and writes out only its soundtrack as an MP3.

Does it work on mobile?

Yes, the tools run in any modern mobile browser. Phones and tablets have less memory than a laptop, so very large or long files may be slower — for heavy files a desktop browser is more reliable. The conversion engine needs WebAssembly and DecompressionStream, which current versions of Chrome, Edge, Safari and Firefox all provide.