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Convert MP3 to AAC

Free MP3 to AAC converter that runs in your browser. No upload, no signup, no watermark. Files never leave your device.

Conversion Successful
100% local. Your file is processed in this tab and never uploaded.

How to Convert MP3 to AAC

  1. 1

    Drop your MP3 file

    Drag it into the converter above, or click to browse. Nothing is uploaded.

  2. 2

    Adjust settings (optional)

    Trim, fade, or adjust volume from the sliders icon.

  3. 3

    Convert and download

    AAC is preselected. The file converts in this tab and downloads when done.

Why Convert MP3 to AAC?

AAC squeezes more quality out of each kilobit than MP3, which is why Apple, YouTube, and most streaming platforms standardized on it. The catch is that MP3 is already lossy, so re-encoding to AAC cannot recover what MP3 threw away and adds a little loss of its own on top.

Convert when a device or app specifically wants AAC, not to improve a file that is already compressed.

MP3
AAC
Compression
Lossy
Compression
Lossy
Typical bitrate
128-320 kbps
Typical bitrate
96-256 kbps
Sample rate
44.1 kHz / 48 kHz
Sample rate
Up to 96 kHz
Metadata
ID3 tags
Metadata
Limited
Device support
Universal
Device support
Apple, Android, modern players
Typical use
Music, podcasts
Typical use
Streaming, Apple devices

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Frequently Asked Questions

Will AAC sound better than my MP3?
No. The MP3 already discarded data during its own encoding, and AAC cannot bring it back. Match the bitrate and the AAC sounds about the same, not better.
Then why convert at all?
Compatibility, mostly. Some Apple workflows, streaming uploads, and apps prefer or require AAC, and AAC is more efficient if you are re-encoding anyway. For a file that already plays fine everywhere, there is little reason to.
What bitrate should I pick?
Stay at or above the source MP3's bitrate, ideally 256 kbps, so the second round of compression is as gentle as possible. Going lower stacks two rounds of loss and it starts to show.
Is AAC the same as M4A?
Close but not identical. AAC is the codec; M4A is the MP4-based container that usually holds AAC audio. This converter outputs AAC in its own standard container.
Is this conversion free, and is my file private?
Yes. The conversion runs in your browser tab, nothing is uploaded, and no account is needed. Files up to 100 MB convert here, limited to 3 conversions per day on this path; the desktop app has neither cap.

Re-encoding a large MP3 collection to AAC?

TeraConvert Desktop batch-converts MP3 files to AAC through native FFmpeg with no file count or size limit.

Get TeraConvert for MacFree to download. This format unlocks with Pro.