Is my file uploaded when converting AAC to MP3?

No. The conversion runs entirely in your browser. The file never leaves your device, there is no server to upload to, and the page works offline once loaded.

Is AAC to MP3 conversion free?

Yes, with no account, no watermark and no file limit per day. frogConvert is open source and there is no server cost to recover, because your device does the work.

How large a file can I convert?

Up to 2 GB for a single file, 500 MB total per batch, and 300 files at once. The practical limit is your device's memory, since everything is processed locally.

Convert AAC to MP3

Converts AAC to MP3 for older players that predate AAC support.

Convert AAC to MP3 →

Runs on: FFmpeg, compiled to WebAssembly, running in this tab
Steps: Direct, a single conversion
Input: .aac · audio/aac
Output: .mp3 · audio/mpeg
Uploads: None. The file never leaves your device.

What to expect

A second lossy encode, and MP3 is the less efficient codec, so this trades quality for compatibility.

Why convert AAC without uploading

Most online converters take your file, send it to their servers, convert it there and hand back a download link. That means your document sits on someone else's disk, subject to their retention policy and their breaches. It also means you cannot use them offline, and cannot use them at all for anything confidential.

frogConvert does the conversion in the page itself, with FFmpeg compiled to WebAssembly. There is no upload step because there is no server. You can disconnect from the network and it still works.

About the formats

AAC

Advanced Audio Coding, MP3's designated successor and the default for Apple Music, YouTube and broadcast. At a given bitrate it is audibly better than MP3. More about AAC files.

MP3

The format that made digital music portable, using perceptual coding to throw away sound judged inaudible. Universally supported and comfortably outperformed by every codec designed since. More about MP3 files.

Common questions

Is my file uploaded when converting AAC to MP3?: No. The conversion runs entirely in your browser. The file never leaves your device, there is no server to upload to, and the page works offline once loaded.
Is AAC to MP3 conversion free?: Yes, with no account, no watermark and no file limit per day. frogConvert is open source and there is no server cost to recover, because your device does the work.
How large a file can I convert?: Up to 2 GB for a single file, 500 MB total per batch, and 300 files at once. The practical limit is your device's memory, since everything is processed locally.
What is lost converting AAC to MP3?: A second lossy encode, and MP3 is the less efficient codec, so this trades quality for compatibility.