Are files uploaded to a server?
Audio files are processed in your browser and are never uploaded to a server.
Video & Audio
Batch Audio Converter - MP3, AAC, WAV, FLAC
Convert multiple audio files in your browser to MP3, AAC (M4A), WAV, or FLAC. Download a ZIP or save directly to a selected folder.
Drop audio files here
Input examples: MP3, M4A, AAC, WAV, FLAC, OGG, Opus, AIFF, WMA (codec support varies)
✓ Audio files are processed in your browser and are never uploaded to a server.
This is a large batch and may take longer or exceed device memory. Direct folder saving is recommended.
Selected files 0
Choose audio files to begin.
Save method
Without overwriting, duplicate names get _2, _3, and so on. Names inside a ZIP follow the same rule.
This browser does not support direct folder saving. Choose ZIP instead.
Downloads contain the previous conversion results. Convert again to apply changed settings.
How to convert audio files in bulk
Choose audio files and set the output format, quality, and naming rule. For ZIP, press Convert and save ZIP. For folder saving, press Choose folder and convert; processing starts as soon as you select the folder. Files remain in the list so you can change settings and convert again.
MP3, AAC, WAV and FLAC compared
MP3 works on many devices. AAC is saved as M4A. WAV uses uncompressed 16-bit PCM. FLAC uses lossless compression and supports common 16-bit and 24-bit audio. Converting compressed audio to WAV or FLAC cannot restore information already lost.
Frequently asked questions
Can I save directly to a folder?
Supported browsers use the File System Access API to save to your selected folder. Other browsers can download a ZIP. Selecting a folder requires browser permission.
What happens to duplicate names?
Without overwriting, duplicate names get _2, _3, and so on. Names inside a ZIP follow the same rule.
What if a file fails to convert?
The list shows the failure reason and processing continues with the other files. Completed results remain available if you cancel.
Can I use a smartphone?
Yes, but large audio files or large batches may exceed device memory. Direct folder saving also depends on browser support.
Can I preserve audio quality?
For MP3 and AAC, Original for matching formats copies matching codecs where possible and uses standard quality for other formats. A selected numeric bitrate may require re-encoding. WAV uses 16-bit PCM. FLAC preserves source precision within supported limits. Tags are preserved where the output format supports them. Embedded artwork is not retained.