# Audio Converter

> Convert audio between MP3, WAV, AAC, OGG and FLAC in your browser.

To convert audio, add your file and choose an output format. MP3 and AAC are lossy and compact, WAV and FLAC are lossless, and OGG Vorbis is an open alternative. Optional EBU R128 normalisation evens out loudness across tracks.

**URL:** https://convertto.tech/t/audio-converter
**Category:** Audio & Video Tools (https://convertto.tech/c/media-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Engine:** FFmpeg compiled to WebAssembly
- **First run:** Downloads ~30 MB of FFmpeg core, then cached
- **Upload:** None — the file never leaves your device
- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Select your audio file — the file stays on your device and is never uploaded.
2. Choose the convert to.
3. Choose the bitrate.
4. Turn "Normalise loudness (EBU R128)" on or off as needed.
5. Press Run, then download the result when it is ready.

## FAQ

### Does converting MP3 to FLAC restore quality?

No. Once information is discarded by lossy compression it is gone. Converting MP3 to FLAC produces a much larger file containing exactly the same audio quality — only convert to lossless from a lossless source.

### Why is the first run slow?

The FFmpeg WebAssembly core is about 30 MB and downloads once per session. After that it stays in the browser cache, and subsequent conversions start immediately.

### Is my video uploaded anywhere?

No. FFmpeg runs inside your browser as WebAssembly, so the file is read from disk into memory and never sent to a server. That is also why there is no file size limit beyond your available RAM.

### Why is it slower than desktop FFmpeg?

WebAssembly runs single-threaded here and cannot use your GPU, so encoding is typically several times slower than a native build. For a short clip that is fine; for a feature-length film, use desktop FFmpeg.

## Related tools

- [Video to MP3 Converter](https://convertto.tech/t/video-to-audio): Extract the audio track from a video and save it as MP3, WAV, AAC or OGG.
- [MP3 to M4A Converter](https://convertto.tech/t/mp3-to-m4a): Convert MP3 audio into an M4A (AAC) file — smaller at the same quality.
- [Audio Trimmer](https://convertto.tech/t/audio-trimmer): Cut a section out of an audio file, with optional fade in and out.
- [Remove Audio from Video](https://convertto.tech/t/mute-video): Strip the audio track from a video without re-encoding the picture.
- [Video Converter](https://convertto.tech/t/video-converter): Convert video between MP4, WebM and MKV entirely in your browser.
- [Video to GIF Converter](https://convertto.tech/t/video-to-gif): Turn a video clip into an animated GIF with control over frame rate and size.
- [AI Text to Speech](https://convertto.tech/t/ai-text-to-speech): Turn text into natural speech with a neural voice running in your browser, and download the audio as a WAV file.
- [Video Compressor](https://convertto.tech/t/video-compressor): Shrink video file size with adjustable quality — locally, with no upload limit.