Free tools for your next audio edit
Convert AAC to MP3. Keep your audio local.
Convert a compatible short .aac file on your device. Choose an MP3 bitrate, preview the result and download without an account or audio upload. You can also choose a WAV working copy.
Convert AAC to MP3
Free · localChoose a supported AAC and prepare an audio file. No audio upload or account required.
AAC is a lossy audio codec; converting to MP3 adds another lossy encode. Browser support varies. If conversion fails, try another browser or a desktop converter. This tool does not separate voices or music, copy tags/artwork, preserve higher bit depth or source codec padding, remove noise, or isolate sound. Input and output must each fit 50 MiB and five minutes; an oversized output is rejected rather than cut. MP3 is a new lossy encode and may add delay or padding. Encoder credits and source are below.
Open, convert, listen
How to convert AAC to MP3
- 01 / OPEN
Choose an AAC file
Select a compatible local .aac file no larger than 50 MiB and five minutes. Browser decoding support varies.
- 02 / CONVERT
Choose a bitrate
MP3 is selected by default. Choose 128, 192 or 320 kbps and convert. Decoded audio must be mono or stereo; the output must also fit 50 MiB.
- 03 / LISTEN
Preview and download
Listen to the actual MP3 and check its length before downloading. Keep the original AAC file.
Choose an output
What happens when you convert AAC to MP3?
AAC and MP3 are lossy codecs. This converter decodes a compatible .aac file in your browser at 48 kHz, then makes a new MP3. Another lossy encode can discard more detail; a higher bitrate cannot restore what the source no longer contains. Compare quiet words, dense music and the ending against the original.
MP3 encoding can add delay or padding, so check alignment if the result will return to a video or multitrack project. Tags and artwork are not copied. Keep the original file for future edits.
Select WAV to create a 16-bit PCM working copy at 44.1 or 48 kHz. WAV avoids another MP3 encode but cannot recover information lost in the AAC source. It may be larger and must fit the 50 MiB output limit. See the MP3 and WAV guide for the tradeoffs.
Check the filename
AAC and M4A are not the same thing
AAC is an audio codec; M4A is a container that can hold AAC or other audio. This page accepts .aac files. If your source ends in .m4a, use M4A to MP3 instead. Renaming the extension does not convert the file. Browser and codec support vary for both paths.
The M4A versus MP3 guide explains why the container name alone does not identify every property of its audio.
If conversion fails
Check the file and browser
First play the source. The file must fit 50 MiB and five minutes, decode to mono or stereo, and produce an output no larger than 50 MiB. Browser and file support vary. For a longer or unsupported file, try a desktop audio converter and verify the result.
For .opus audio use Opus to MP3. To test separating a voice from a mixed recording, prepare a supported file and use the separate voice isolator; AI downloads require an account and credits.
MP3 encoder credits
Built with the LAME encoder via lamejs.
The optional MP3 download uses lamejs 1.2.1 by Alex Zhukov, a JavaScript port of the LAME MP3 encoder. Its unmodified script is served separately. See the attribution and source notes, upstream license notice, LGPL-3.0 and GPL-3.0 texts, and complete upstream source package.
A few useful answers
Free AAC to MP3 converter questions
How do I convert an AAC file to MP3?
Choose a compatible local .aac file up to 50 MiB and five minutes, select an MP3 bitrate, then convert, preview and download. Decoded audio must be mono or stereo and the output must also fit 50 MiB. Browser support varies.
Does this upload my audio?
No. The browser reads and converts the selected file locally. Download the result before leaving the page.
Does MP3 preserve the AAC exactly?
No. AAC and MP3 are lossy codecs; the browser decodes and resamples the source, then creates a new MP3 that can discard more detail and add delay or padding. Keep the original.
Can I convert AAC to WAV instead?
Yes. Select WAV to create 16-bit PCM at 44.1 or 48 kHz. The same limits apply. WAV does not recover detail already lost in the AAC source.
Can I use an M4A file here?
This page accepts .aac files. An M4A container can contain AAC or another codec; use the separate M4A-to-MP3 converter for a compatible .m4a file. Renaming does not convert it.
After preparing your audio