Audible audiobook
Writableaudio
file format
Identify it
| Extensions | .aa.aax |
|---|---|
| MIME types | audio/vnd.audibleaudio/x-pn-audibleaudio |
| Wikidata | Q27960055 |
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Open it
Convert it
| To | With | Fidelity | Command and losses |
|---|---|---|---|
| FLAC (Free Lossless Audio Codec) 1.2.1 | FFmpeg | Lossless | ffmpeg -i in.aa out.flacLossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata. |
| Waveform Audio | FFmpeg | Lossless | ffmpeg -i in.aa out.wavLossless for decoded audio; a lossy source stays as degraded as it was. WAV may reduce bit depth or drop metadata. |
| Matroska 1-4 | FFmpeg | Lossy | ffmpeg -i in.aa out.mkvRe-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
| MPEG 1/2 Audio Layer 3 | FFmpeg | Lossy | ffmpeg -i in.aa out.mp3Lossy re-encoding. |
| MPEG-4 Part 14 | FFmpeg | Lossy | ffmpeg -i in.aa out.mp4Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
| Ogg | FFmpeg | Lossy | ffmpeg -i in.aa out.oggLossy re-encoding. |
| WebM | FFmpeg | Lossy | ffmpeg -i in.aa out.webmRe-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
Sources
From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), Wikidata. Updated 2026-10-24.