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Audio

MP3 to AAC Converter

Free, private, and instant — your files never leave your device.

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AAC (Advanced Audio Coding) is the successor to MP3, offering comparable or better perceptual quality at lower bitrates. It's the default codec for Apple Music, YouTube, and most modern mobile platforms. Converting existing MP3 files to AAC can improve streaming efficiency and Apple device compatibility.

When you’d want this conversion

  • Preparing audio for Apple ecosystem apps or devices that handle AAC natively.
  • Reducing file size for mobile streaming while maintaining target quality.
  • Delivering audio for YouTube uploads where AAC is the preferred input codec.
  • Normalizing a mixed library to a single modern codec.

What to watch for

This is a lossy-to-lossy transcode — the original MP3 encoding already discarded some frequency content, and AAC will encode from that degraded signal. For best results, convert from a lossless source (WAV or FLAC).
The output is an AAC raw bitstream (.aac) — some players prefer it wrapped in an M4A container, which uses the same codec.
From.mp3

MP3

MPEG-1 Audio Layer III

  • Lossy compression
  • Size: small (3–10 MB / song)
  • Best for: music streaming, podcasts, broad device support
To.aac

AAC

Advanced Audio Coding

  • Lossy compression
  • Size: small (3–8 MB / song)
  • Best for: mobile streaming, YouTube, Apple devices

More MP3 Conversions

MP3 to WAV Converter MP3 to FLAC Converter MP3 to OGG Converter MP3 to M4A Converter

Convert Other Formats to AAC

WAV to AAC Converter FLAC to AAC Converter

Related Tools

Convert AAC to MP3 Audio Converter All Conversions

How to Use

  1. 1

    Drop your audio file onto the converter above, or click to browse.

  2. 2

    Select your target format from the format buttons.

  3. 3

    Click Convert — processing happens entirely in your browser.

  4. 4

    Preview the result with the built-in audio player, then download.

Frequently Asked Questions

Is AAC better than MP3?

AAC generally offers better audio quality than MP3 at the same bitrate, particularly at 128 kbps and below. At higher bitrates (192+ kbps) the difference is minimal in most listening tests.

What's the difference between AAC and M4A?

AAC is the codec (compression algorithm); M4A is the container file format that wraps AAC audio in an MPEG-4 container. The audio is identical — M4A just adds better metadata support and is preferred by iTunes.

Which bitrate should I use for AAC?

This converter uses 192 kbps AAC, which is transparent (indistinguishable from lossless) for most listeners on most playback systems. For voice-only content, 96–128 kbps is sufficient.

Convert any audio format

Drop any audio file into the converter — MP3, WAV, M4A, AAC, OGG, FLAC, or Opus.

Audio Converter