Audio Converter
Audio Converter changes your audio files between MP3, WAV, OGG, AAC, FLAC, and M4A formats, directly in your browser. All codec work runs locally using FFmpeg.wasm. No file is uploaded to any server — your audio never leaves your device, and the result is ready in seconds.
Drag & drop your file here
or browse files from your device
Max size limit: 100 MB per file
Specifications
Guide
Upload your audio file
Drop an MP3, WAV, OGG, AAC, FLAC, or M4A file onto the upload zone, or click to browse. Files up to 100 MB are supported.
Choose your output format
Select the format you need from the dropdown — MP3, WAV, OGG, AAC, or FLAC.
Convert and download
Click Convert. FFmpeg.wasm handles the codec transcoding entirely in your browser. Download your converted audio file when done.
Key features
Six formats supported
Convert between MP3, WAV, OGG, AAC, FLAC, and M4A - covering all common use cases from streaming to archiving.
Lossless FLAC and WAV
Convert to FLAC or WAV for a perfectly lossless archive copy of your audio.
FFmpeg.wasm codec engine
Uses the same codec libraries as professional audio software, running in WebAssembly inside your browser.
No file size limits on output
Input is capped at 100 MB per file, but there are no limits on how many conversions you run.
No upload, no account
Your audio stays on your device. ZenTools has no server that receives your files.
Frequently asked questions
Yes, everything runs in your browser using FFmpeg.wasm. No file is uploaded to any server, no server ever processes your audio, and your file never leaves your device.
Input formats: MP3, WAV, OGG, AAC, FLAC, and M4A. Output formats: MP3, WAV, OGG, AAC, and FLAC. All the common formats for streaming, editing, and archiving.
Up to 100 MB per audio file. There is no limit on the number of conversions you can run in a session.
Yes, it works on any modern browser — desktop or mobile. Processing is done entirely in the browser tab, so no app install is needed.
Yes, completely free. No signup, no account, no watermark, and no daily quota. Just open the page and start using it.
Learn more
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