Batch Audio Converter
Drop a whole folder of audio files, pick one target format, and convert them all in a single job. Mix inputs freely. WAV, MP3, M4A, FLAC, and more, and get them out as MP3, WAV, FLAC, OGG, M4A, or AIFF. Everything runs 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, mix them however you like. 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. One setting applies to the whole queue.
Single target for the whole batch
Convert and download
Click Convert all. Each file processes in turn with its own progress bar, then grab them individually or with the bulk Download button.
ffmpeg.wasm runs in a Web Worker so the UI stays responsive
One job, whole folder
Stop converting files one at a time
Converting a hundred tracks by hand, one upload at a time, is exactly the kind of tedium a computer should handle. Drop the whole lot at once, pick the format, and walk away, it works through the queue on its own. A ripped CD collection, a folder of voice memos, a project's worth of stems, all done in a single pass.
Mix and match
Different formats in, one format out
The batch doesn't care if your files are a jumble, throw in WAVs, MP3s, and M4As together and they all come out as the single format you chose. It's the fastest way to unify a messy library, standardize a folder of downloads, or prep a stack of clips that need to match before the next step.
No server, no wait
Big batches without a timeout or an upload bar
Because every conversion runs locally with ffmpeg.wasm, there's no file leaving your device and no server clock ticking down. A huge queue just takes as long as your machine needs, no 'too many files' error, no account, no watermark. The first conversion warms up the ffmpeg core (~25 MB, cached after), then the rest fly.
Frequently asked questions
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. Every conversion after that, in the same session and on later visits, starts instantly.
Goes well with this tool
MP3 to WAV
Convert single MP3s to WAV.
WAV to MP3
Encode WAV to high-quality MP3.
WAV to FLAC
Shrink WAVs to lossless FLAC.
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Supports WAV · FLAC · MP3 · M4A · AIFF