MP3 Converter Free Online
Convert any audio file to MP3 format for free. Supports WAV, M4A, OGG, FLAC, AAC, and MP4 video files. Choose your output bitrate and quality, then download the MP3. Process multiple files at once with batch conversion. Everything runs in your browser with no upload required.
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- Only upload files you have the right to use. Copying or sharing other people's music, videos or recordings without permission can violate copyright law. FreeSoundTools does not store your files on a server.
When to use it
- Convert voice memos from M4A to MP3 for wider compatibility
- Extract audio from MP4 video files as MP3
- Convert lossless WAV or FLAC files to MP3 for smaller file sizes
- Batch convert a folder of audio files to MP3
How to use
- Drop your audio files into the box (add several for batch conversion).
- The tool detects the format automatically.
- Choose MP3 as the output format and set the quality/bitrate.
- Press Save to download the MP3 file.
- For multiple files, download all at once as a ZIP.
How it works
Audio is decoded in your browser using the Web Audio API, then re-encoded as MP3 using a built-in encoder. The conversion happens entirely on your device. No file is uploaded to any server, which makes it safe for private recordings. How to verify. Also available as a free REST API for developers and AI agents (edge-processed, zero retention).
Also available as: Audio Converter (all formats) | WAV to MP3
FAQ
What formats can I convert to MP3?
WAV, M4A, OGG, FLAC, AAC, MP4, WebM, and most formats your browser can play.
Can I choose the MP3 bitrate?
Yes. You can set the quality level, which controls the bitrate. Higher quality means larger files.
Can I convert multiple files at once?
Yes. Add several files and they will be converted one by one. Download all results as a ZIP.
Does conversion lose quality?
MP3 is a lossy format, so some quality is lost compared to WAV or FLAC. At high bitrates (192-320 kbps) the difference is usually inaudible.
Are my files uploaded?
No. Everything runs in your browser. Your files stay on your device.
Last checked: October 10, 2026 · FreeSoundTools team