Convert audio between MP3, WAV, M4A, OGG and FLAC
Drop one or many audio files and pick the output format. Voice memos (M4A) become MP3 for sharing, WAV masters become small MP3s, FLAC archives become playable anywhere. Conversion happens on your device.
How to use the Audio Converter
- Drop audio files (up to 50).
- Choose the output format and, for MP3/M4A, a bitrate.
- Click Convert; files are processed one after another with progress.
- Download individually or as a ZIP.
Lossy vs lossless
MP3, AAC (M4A) and Vorbis (OGG) are lossy: they discard sound the ear is least likely to notice and achieve 5–10× smaller files. WAV and FLAC are lossless: WAV stores raw samples, FLAC compresses them by 40–60% without any loss. Converting lossy to lossless does not restore anything (an MP3 saved as WAV is just a large MP3-quality file), and converting between two lossy formats loses a little more each time, so keep an original where you can.
Which format for which job
| Need | Format |
|---|---|
| Send to anyone, play anywhere | MP3 192 kbps |
| Apple devices, voice memos | M4A |
| Editing, mastering, samples | WAV |
| Archive a CD rip losslessly | FLAC |
| Games, open-source apps | OGG |
Input formats
MP3, WAV, M4A/AAC, OGG/Opus, FLAC, WMA, AIFF and the audio track of most video files are accepted. Sample rate and channels are preserved; a mono voice memo stays mono, which keeps MP3 files small.
How it runs without uploading
This tool uses ffmpeg, the same open-source engine behind most video software, compiled to WebAssembly. The first time you use a video tool the engine (about 30 MB, shared with the video tools) is downloaded from a content delivery network and cached by your browser; after that it loads instantly, even offline. Your video is read into memory, processed by the engine inside the browser sandbox, and the result is offered as a download. Nothing is transmitted. Because it runs on one CPU core, encoding takes roughly real time to three times real time depending on your device: a 30-second clip takes 30–90 seconds, a 10-minute video may take 10–30 minutes and needs a few hundred megabytes of free memory. For long videos, trim first or use a desktop tool.
Frequently asked questions
Does converting WAV to MP3 lose quality?
Slightly; at 192 kbps or above most listeners cannot tell. Keep the WAV if you may edit later.
Can I convert many files at once?
Yes, up to 50 per batch; download them as a ZIP.
Are files uploaded?
No. Conversion runs in your browser.
Privacy
This tool runs entirely inside your browser using WebAssembly and the Canvas/File APIs. Your files are never uploaded to ToolFlint or any third party; you can verify this in your browser's network tab or by switching to airplane mode after the page loads. Read how we process files.
Last updated 2026-09-23.