Convert MP3 to AAC Online Free
MP3 is the most universally compatible lossy audio format for music and voice. AAC is a lossy format that generally sounds better than MP3 at the same bitrate. FileConverter turns your MP3 into AAC online in seconds - free, privacy-first, and with no software to install or account to create.
Convert MP3 to AAC
AAC is already selected. Add your MP3 file to start.
Documents
Images
Videos
Audio
Add a MP3 file above to start the conversion.
MP3 to AAC re-encodes audio into Apple's preferred format, which generally sounds a touch better at the same bitrate on modern devices.
What changes when you convert MP3 to AAC
Re-encoding between two lossy audio formats can compound quality loss slightly, so convert from the highest-quality MP3 source you have to keep the AAC output clean.
About the MP3 format
MP3 compresses audio to small sizes with quality that is more than good enough for most listening. It plays on every device and app, which is why it remains the default for music, podcasts, and voice recordings. In everyday use, MP3 is chosen for music libraries and playlists, podcasts and voice recordings and sharing audio that must play everywhere. It opens in every phone, browser, car stereo, and media player.
About the AAC format
AAC is the audio standard behind Apple Music, YouTube, and most streaming services, offering superior quality to MP3 at equivalent file sizes. It is well supported on modern devices. In everyday use, AAC is chosen for Apple Music and iTunes libraries and streaming and mobile audio. It opens in Apple devices, modern phones, and most players.
MP3 vs AAC
MP3 is best known for plays on essentially every device, while AAC stands out for better quality than MP3 at the same bitrate. Choosing between them comes down to where the file needs to go next.
Common use cases
People convert MP3 to AAC for jobs such as Apple Music and iTunes libraries and streaming and mobile audio. It is especially common when a MP3 file arrives from one system but needs to work in another that standardises on AAC.
When to convert MP3 to AAC
Reach for MP3 to AAC when your destination expects AAC — for example Apple Music and iTunes libraries and streaming and mobile audio. It is the right move when you receive a MP3 file but the app, website, or person you are working with cannot use it. Bear in mind that slightly less universal than MP3 on very old hardware, so keep your original MP3 if you might need it again.
How to convert MP3 to AAC
- Upload your MP3 file to the converter at the top of this page - AAC is already selected as the output.
- Check the size limit shown on this page, then drag and drop or browse for your file.
- Confirm AAC is still the target format, or pick a different one from the grid.
- Start the conversion and download your AAC file the moment it is ready.
Quality tips
For voice and podcasts, a moderate AAC bitrate is plenty. For music you plan to edit later, keep a lossless master before exporting to AAC.
Platform compatibility
The MP3 to AAC converter runs on Windows, macOS, Linux, Android, and iOS - anywhere with a modern browser, with no plugins or permissions required. Once exported, AAC opens in Apple devices, modern phones, and most players.
File size limits
Video/audio up to 2GB
Troubleshooting
- If the file exceeds the limit shown below, compress images, trim video, or split archives before retrying.
- If conversion fails, confirm the extension matches the real format — renaming a file alone does not change its contents.
- Converting a lossy file to a lossless format will not improve its sound quality.
Explore more: audio Conversion Hub · File format guides · All tools