Convert AAC to MP3 online for free. No software needed. Up to 100 MB.
Drop your AAC file hereTap to choose your AAC file
or
Also supports WAV, M4A, FLAC, OGG, WMA, AIFF, OPUS • Max 100 MB
Drag and drop your AAC file into the converter above, or click Choose AAC File to browse your device.
Click Convert to MP3. Our server converts your file in seconds using high-quality encoding.
Click Download MP3 to save the converted file. That's it — no registration, no email required.
AAC (Advanced Audio Coding) is a lossy audio codec standardized as part of MPEG-2 and MPEG-4. It was designed as the successor to MP3, offering better sound quality at equivalent bitrates.
AAC is the default audio format for Apple devices (iTunes, iPhone, iPad), YouTube, and many streaming services. It's also used in M4A containers and is the audio codec inside most MP4 video files.
MP3 (MPEG Audio Layer 3) is the most widely supported audio format in the world. Developed in the early 1990s, it became the standard for digital music distribution.
Every device, media player, car stereo, and operating system supports MP3 playback. While technically less efficient than AAC, MP3's universal compatibility makes it the safest choice when sharing audio.
| Feature | AAC | MP3 |
|---|---|---|
| Codec type | Lossy (newer, more efficient) | Lossy (older, widely supported) |
| Quality at 128 kbps | Good (comparable to 192 kbps MP3) | Acceptable |
| Typical bitrate | 96–256 kbps | 128–320 kbps |
| File size (4 min song) | ~4 MB at 128 kbps | ~5 MB at 160 kbps |
| Device compatibility | Apple, modern devices | Universal (all devices) |
| Car stereo support | Newer models only | All car stereos with USB/AUX |
| Used by | Apple, YouTube, streaming | Everything, everywhere |
| Best for | Apple ecosystem, efficient storage | Sharing, universal playback |
While AAC plays well on Apple devices and modern players, many older devices, car stereos, and DJ software only support MP3. Converting to MP3 guarantees playback everywhere.
Some audio editors, video editors, and website builders don't accept AAC input. MP3 is universally supported by all audio software, making it the safer format for editing and embedding.
When sharing audio via email or messaging apps, MP3 is understood by every recipient regardless of their device. No compatibility issues, no codec errors, just audio that works.
If you're moving from iPhone to Android, or sharing audio with non-Apple users, MP3 avoids any potential compatibility issues. It's the universal language of digital audio.