MP3 to AAC Converter
Convert MP3 files to AAC in seconds, right in your browser. Drop in one file or a whole folder, pick your quality settings and download - nothing is uploaded to a server.
Drop MP3 files here
MP3, WAV, FLAC, M4A, OGG, OPUS, AAC, AIFF, WMA, AMR, MP4, MOV & more · Processed on your device - nothing is uploaded
How to convert MP3 to AAC
- Click "Choose files" or drag your MP3 files onto the page.
- Make sure "AAC" is selected as the output format (192 kbps is a good default).
- Optionally click Edit to trim, adjust volume or add effects.
- Click Convert, then Download your AAC files.
Why convert MP3 to AAC?
AAC may be better supported by your device or app. To keep quality, choose a bitrate equal to or higher than the original MP3.
AAC is best for streaming, broadcast and devices that need a raw AAC stream. Most phones, browsers, smart TVs and media players.
Will I lose quality?
Converting between two lossy formats re-encodes the audio, which can add a small amount of loss. Use a bitrate at least as high as the original (192 kbps or more) to keep it transparent.
MP3 vs AAC
| MP3 | AAC | |
|---|---|---|
| Full name | MPEG-1 Audio Layer III | Advanced Audio Coding (ADTS) |
| Type | lossy | lossy |
| Best for | music libraries, sharing, podcasts and playback on any device | streaming, broadcast and devices that need a raw AAC stream |
| Typical size | ~1.4 MB at 192 kbps per minute | ~1.4 MB at 192 kbps per minute |
| Compatibility | Plays on virtually every phone, computer, car stereo, browser and media player. | Most phones, browsers, smart TVs and media players. |
| Developed by | Fraunhofer IIS / MPEG (1993) | MPEG (1997) |
MP3 to AAC: questions
How do I convert MP3 to AAC?
Open this page, add your MP3 file, make sure AAC is selected as the output format and click Convert. Your AAC file is ready to download in seconds.
Will converting MP3 to AAC lose quality?
Converting between two lossy formats re-encodes the audio, which can add a small amount of loss. Use a bitrate at least as high as the original (192 kbps or more) to keep it transparent.
Is this MP3 to AAC converter free and safe?
Yes. It's free with no watermark or sign-up. Files are processed locally in your browser, so your audio is never uploaded or stored on our servers.
Can I convert many MP3 files to AAC at once?
Yes - add up to 5 files at a time on the free plan (unlimited with Pro), convert them all with one click and download them as a ZIP.
What is the difference between MP3 and AAC?
MP3 (MPEG-1 Audio Layer III) is a compressed (lossy) format, the most widely supported compressed audio format. MP3 removes sounds the ear is unlikely to notice to make files about 10x smaller than CD audio. AAC (Advanced Audio Coding (ADTS)) is a compressed (lossy) format: raw AAC audio stream. The successor to MP3 used by YouTube, iPhone and digital radio.
Does it work on Mac, Windows, iPhone and Android?
Yes. The MP3 to AAC converter runs in any modern browser - Chrome, Safari, Edge or Firefox - on desktop and mobile. No software to install.