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Drop one AAC or two hundred. Batch conversion is not a paid feature here.
Convert AAC to MP3
An AAC file from a stream capture or an old download will not play in a piece of software or hardware that only knows MP3.
Runs on your deviceFreeNo sign-upBatch supported
Audio is re-encoded on your device. The engine downloads once, then works offline.
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
AAC and MP3 are not the same picture in two wrappers.
The AAC stream is decoded and re-encoded as MP3, which loses a little quality but plays everywhere.
Worth knowing first
A bare .aac file is often an ADTS stream with no container, so it carries no tags, no duration and no seek index. That is why some players show it with no title and cannot skip through it, and why converting to MP3 also gives you a properly structured file.
Questions
AAC to MP3, answered
Is AAC better than MP3?
Yes at the same bitrate, particularly below 128 kbps. That advantage does not survive a transcode into MP3.
What bitrate should I use?
Slightly above the source, for example 192 kbps MP3 from a 160 kbps AAC, so the MP3 encoder is not the bottleneck.
How to convert AAC to MP3
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Choose your settings
MP3 Audio is lossy, so the quality control decides the trade between size and fidelity.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.