Tool 19 · AAC to MP3 · Free · No signup
AAC to MP3.
A .aac file is the bare AAC stream, with no container around it, and plenty of players, editors and cars will not take it. Drop one or a batch and each comes back as an MP3 that plays anywhere. Converted on your own machine.
01 Files
MP3, WAV, M4A, AAC, FLAC, OGG and Opus, or a video for its sound, as many as you like. The files are read on your device and never upload.
02 Convert to
192 kbps is transparent for most music; 320 if it is going back into an editor; 128 is plenty for speech. Title, artist, album and cover are carried over. Each file downloads as it finishes.
Converted, then a video
A song on its way to YouTube, TikTok or Reels still needs a picture there. Above, a frame from our music visualizer, which turns the converted file into a video that moves with it. For a cover held still with the sound, use MP3 to MP4; for a voice recording, the waveform video maker.
How to convert AAC to MP3
A .aac file is an ADTS stream: the same AAC audio an M4A holds, without the MPEG-4 file around it that gives a player its length, its seek table and its tags. Recorders, call and screen recorders and radio capture tools write it, and many players and editors refuse it or cannot seek in it. Converting decodes the stream and writes an MP3 with a proper length, in your browser.
- Drop the .aac files anywhere on the page, or click to choose them, one or a whole folder. Each shows its format, sample rate and length at once. No file to hand? Try the sample.
- Keep MP3 and pick the bitrate: 192 kbps for music, 320 if it is going back into an editor, 128 for speech.
- Press Convert. The files go one after another, each with its own progress line, and each MP3 downloads under the original name as soon as it is done.
Related
- Audio converterEvery format in, MP3, WAV or M4A out, and what each one does.
- WAV to MP3The same converter for a WAV file.
- M4A to MP3The same converter for a M4A file.
- FLAC to MP3The same converter for a FLAC file.
- OGG to MP3The same converter for a OGG file.
- Opus to MP3The same converter for a OPUS file.
- MP3 to MP4The converted file with a cover, as a 1080p video.
- MP3 tag editorFix the title, artist or cover in the MP3.
- Audio trimmerOnly need part of it? Cut it down first.
Questions
What is the difference between .aac and .m4a?+
The audio is the same kind; the file is not. An M4A wraps AAC in an MPEG-4 container with a length, a seek table and room for tags and a cover. A .aac is the bare stream, which is why some players show no length and cannot skip ahead. If your file ends in .m4a, the M4A to MP3 page is the one for it, though both pages take both.
Could I just rename the .aac to .mp3?+
No. MP3 and AAC are different codecs, so a renamed file is still AAC inside, and players that check will refuse it or play noise. Converting decodes the AAC and encodes real MP3 frames.
Does it lose quality?+
In principle a little: both formats are lossy, so this is a second lossy pass. Convert at a bitrate at or above the AAC's own (192 or 320 kbps for music, 128 for speech) and it is not something you will hear.
Which browsers read a raw .aac?+
Chrome and Edge, tested here, and Safari. If one browser refuses the file, try Chrome.
Is my audio uploaded?+
No. Each file is decoded and encoded in your browser, a piece at a time, and the download is made there. Nothing leaves your machine, nothing is watermarked, and there is no queue. The page only counts that a file was converted, with the formats, never a name or the audio.
How fast is it?+
Measured in Chrome on a laptop with a two minute song: WAV to a 192 kbps MP3 in about two and a half seconds, MP3 to WAV in under two. A phone is slower. Files go one at a time, so a batch takes the sum of its files.
Which encoder makes the MP3?+
LAME, the open-source MP3 encoder most audio software uses, compiled to run in the browser. The MP3 is constant bitrate at the source's sample rate (48 kHz for anything above), with an ID3v2 tag.