Audio Converter
Convert your audio files between MP3, WAV, OGG, FLAC, AAC, and M4A formats. All conversions happen locally in your browser.
100% private
Audio never leaves your browser
Lossy + lossless
MP3, AAC, OGG, FLAC, WAV, M4A
Any bitrate
128, 192, 256, 320 kbps
Output Format
Quality Settings
Sample Rate
Drop audio files here
or click to browse
FormatFuse's audio converter runs entirely in your browser using the WebCodecs API and WebAssembly. You can convert between lossy formats (MP3, OGG, AAC, M4A) and lossless formats (WAV, FLAC) without uploading a single byte to a server, making it safe for voice notes, interviews, podcast masters, and any other audio you would rather not hand to a third party.
Beyond the format switch, you can fine-tune the output bitrate from 128 kbps up to 320 kbps for lossy encodes, or pick a target sample rate of 44.1 kHz or 48 kHz. That makes it practical for both quick compatibility fixes (for example, converting WMA to MP3 for an older car stereo) and archival workflows where you want FLAC from a WAV master.
Batch conversion is supported — drop a whole folder of files into the page and each one is processed with the same settings. Because everything is client-side, there is no queue, no account, and no file size limit imposed by our servers; the only practical ceiling is what your device can hold in memory.
Audio Converter — Frequently Asked Questions
How do I convert M4A to MP3 (or WMA to MP3)?
Drop your .m4a, .wma, or any supported audio file onto the page, pick MP3 as the output format, choose a bitrate (320 kbps for music, 192 kbps for most listening, 128 kbps for spoken word), and hit Convert. Output downloads as soon as encoding finishes.
What's the difference between lossy and lossless audio?
Lossy formats (MP3, OGG, AAC, M4A) compress by removing audio data the ear is less likely to notice — smaller files, slight quality tradeoff. Lossless formats (WAV, FLAC) keep every sample exactly as recorded. FLAC adds lossless compression, so files are roughly half the size of WAV with zero quality loss.
Which MP3 bitrate should I use?
128 kbps is fine for podcasts and speech. 192 kbps strikes a good quality/size balance for casual music listening. 256 kbps covers most music well. 320 kbps is the highest MP3 quality, recommended for audiophile listening or when you might re-encode later.
What audio formats does the converter support?
Input: MP3, WAV, OGG, FLAC, AAC, M4A, WMA, and AIFF. Output: MP3, WAV, OGG, FLAC, AAC, M4A. WMA input is supported but not as an output format.
Can I convert multiple audio files at once?
Yes. Drop a folder and every file is processed with the same bitrate and format settings in turn. Outputs download individually as each one finishes.
Is my audio uploaded anywhere?
No. All conversion runs locally using WebCodecs and WebAssembly. Your audio files never leave your device — safe for interviews, voice memos, and confidential recordings.
How do I convert M4A to MP3 (or WMA to MP3)?
Drop your .m4a, .wma, or any supported audio file onto the page, pick MP3 as the output format, choose a bitrate (320 kbps for music, 192 kbps for most listening, 128 kbps for spoken word), and hit Convert. Output downloads as soon as encoding finishes.
What's the difference between lossy and lossless audio?
Lossy formats (MP3, OGG, AAC, M4A) compress by removing audio data the ear is less likely to notice — smaller files, slight quality tradeoff. Lossless formats (WAV, FLAC) keep every sample exactly as recorded. FLAC adds lossless compression, so files are roughly half the size of WAV with zero quality loss.
Which MP3 bitrate should I use?
128 kbps is fine for podcasts and speech. 192 kbps strikes a good quality/size balance for casual music listening. 256 kbps covers most music well. 320 kbps is the highest MP3 quality, recommended for audiophile listening or when you might re-encode later.
What audio formats does the converter support?
Input: MP3, WAV, OGG, FLAC, AAC, M4A, WMA, and AIFF. Output: MP3, WAV, OGG, FLAC, AAC, M4A. WMA input is supported but not as an output format.
Can I convert multiple audio files at once?
Yes. Drop a folder and every file is processed with the same bitrate and format settings in turn. Outputs download individually as each one finishes.
Is my audio uploaded anywhere?
No. All conversion runs locally using WebCodecs and WebAssembly. Your audio files never leave your device — safe for interviews, voice memos, and confidential recordings.