Audio Converter
Convert MP3, WAV, M4A, AAC, FLAC or OGG to MP3 or WAV — entirely in your browser.
Select an audio file
Drop in any common audio file (MP3, WAV, M4A, AAC, FLAC or OGG) and convert it to MP3 or WAV — in your browser, nothing uploaded.
Click to choose, or drop a file here
About converting audio in your browser
This tool converts common audio files to MP3 or WAV without uploading anything. The browser's own Web Audio API decodes the source — MP3, WAV, M4A/AAC, FLAC or OGG — into raw PCM samples, then those samples are re-encoded: WAV is written directly, and MP3 uses a JavaScript port of the LAME encoder loaded on demand. Your file never leaves the page.
Deliberately, there is no ffmpeg here. A browser build of ffmpeg is a 25 MB download, needs cross-origin isolation headers that break embedded content, and its MP3/AAC encoders carry licensing that doesn't fit an ad-supported site. Audio conversion doesn't need any of that — the Web Audio API plus a small MP3 encoder covers the cases people actually search for.
The trade-offs: output is limited to MP3 and WAV (FLAC and Opus encoders would add a large download for a small audience), and the whole file is held in memory while it's processed, so a multi-hour recording depends on your device's RAM. For short-to-medium files it's instant and completely private.
Supported files
Accepts MP3, WAV, M4A, AAC, FLAC and OGG. Produces an MP3 (128–320 kbps) or a 16-bit WAV.
Is my file uploaded?
No. The file is decoded and re-encoded entirely in your browser with the Web Audio API and an in-browser LAME port. Nothing is uploaded, and the tool keeps working offline once the page has loaded.
Common problems
- "Couldn't decode this file's audio"
- Your browser can't read that codec. Try Chrome, or convert the file to WAV in another app first.
- The tab runs out of memory on a long file
- Very long recordings are held in memory while processing. Trim the file first, or split it into parts.
How to use the Audio Converter
- 1
Add your audio
Drop in an MP3, WAV, M4A, AAC, FLAC or OGG file — it's decoded in your browser, never uploaded.
- 2
Pick a format
Choose MP3 (with a bitrate) or WAV for the output.
- 3
Convert and download
Click Convert audio and save the new file.
Related PDF tools
Audio Converter — frequently asked questions
Is my audio uploaded?+
No. The file is decoded and re-encoded entirely in your browser using the Web Audio API — it never leaves your device. There's no ffmpeg and no server.
Which formats can I convert from?+
Anything your browser can decode — MP3, WAV, M4A/AAC, FLAC and OGG all work. Output is MP3 or WAV.
Why no FLAC or OGG output?+
Those need a separate encoder that would add a large download. MP3 (via a small in-browser encoder) and WAV (native) cover the common cases without the weight.
Is there a length limit?+
No fixed limit, but a very long file is held in memory while it's processed, so extremely large files depend on your device's RAM.
Do you upload my files to a server?+
No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The only exception is the AI tools, which send the extracted text (not the file) to Claude to do their work.
Is there a file size limit?+
There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.
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