MixMasterAIBatch Audio Converter — Convert dozens of files in one go
Drop a whole folder of audio files. Pick a target format. Convert them all and download the results — all in your browser, with nothing uploaded.
How it works
Drop your files
Drag any number of audio files onto the drop zone — MP3, WAV, FLAC, OGG, AAC, M4A, WMA, AIFF. Files stay in your browser.
Max 200 MB per file
Pick a target format
Choose what you want them all converted to — MP3 320 kbps, WAV 16-bit, FLAC, OGG Vorbis, M4A AAC, or AIFF.
Convert and download
Click Convert all. The tool processes each file in sequence, with a progress bar per file. When everything finishes, click Download to grab the results — one click per file, or use the bulk Download button.
ffmpeg.wasm runs in a Web Worker so the UI stays responsive
FAQ
How many files can I convert at once?
There's no hard cap on the number of files, but each file is limited to ~200 MB. Conversions run sequentially — large queues take longer, but everything is local so there's no server timeout to worry about.
Can I mix input formats?
Yes. The batch converter accepts any combination of supported input formats and converts them all to the single target format you choose. So you can drop a mix of WAV, MP3, and M4A files and convert them all to FLAC in one job.
Does my file get uploaded?
No. Every conversion runs in your browser using ffmpeg.wasm. No file leaves your device, and nothing is stored on any server.
Why does the first conversion take longer?
On first use, the ffmpeg.wasm core (~25 MB) downloads and caches in your browser. Subsequent conversions in the same session — and on later visits — start instantly.