Convert MP3 files into AAC, the modern format for streaming and mobile devices with efficient compression. Conversion happens locally in your browser, with no upload of your audio.
In “Local” mode your file never leaves your device. No uploads, no server – ideal for sensitive recordings.
Pick “Local” for full privacy or “Server” for very large files and every format.
No sign-up, no queue, no watermark. Choose a file, convert, download.
For a fresh recording AAC is often a bit more efficient, but converting an existing MP3 can't raise its quality. Since both are lossy, you lose a little rather than gain.
Some platforms and devices expect AAC or play it back better. In those cases the conversion is worthwhile even without a quality gain.
No, conversion runs directly in your browser by default. Only the optional server mode for very large files transfers any data.
Yes, you can set the target bitrate. Don't set it higher than the source MP3, as that just enlarges the file without adding quality.