Convert MP3 to AAC online. MP3 and AAC both use lossy compression. Free batch processing with no signup or watermark.
Drop or click to add one or more audio files
Add one or more MP3 files. You can review the complete batch before processing it.
AAC is already selected for this page. Add multiple audio files and use the available codec, trim, volume, fade and reverse controls.
Start the batch, then download and check the finished AAC file or files.
MP3 and AAC both use lossy compression. Re-encoding may introduce a small additional quality loss, especially in audio that has already been compressed several times.
MP3 is the world’s most popular audio format. Its lossy compression shrinks music and audio to a fraction of the original size while keeping quality good enough for almost any use, which is why it plays on virtually every device and app.
MP3 plays everywhere - any music app, browser, phone, car stereo, and the default player on Windows, macOS, Android and iOS.
AAC (Advanced Audio Coding) is the successor to MP3, delivering better sound at the same file size. It is the default for Apple Music, YouTube and most streaming services, and is supported across virtually all modern devices.
AAC plays in Apple Music/iTunes, QuickTime, VLC and on nearly all modern phones, browsers and players.
ToolSpice can convert your MP3 files to these other formats:
These other formats can be converted to AAC on ToolSpice: