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ALAC → AAC
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Fast, secure ALAC to AAC conversion. No registration required.
Here is the short version — ALAC is Apple Lossless Audio Codec, offering FLAC-like compression inside MP4 containers. Hence the need for AAC. A ALAC to AAC transcode is mostly about compatibility, not fidelity. At sensible default bitrates you cannot tell the two apart by ear; what you get is a file that actually opens on the hardware or website you were aiming at. FFmpeg handles the heavy lifting and we stream the result straight back as a download. A quick refresher — ALAC is Apple Lossless Audio Codec, offering FLAC-like compression inside MP4 containers. By contrast, AAC is the Advanced Audio Codec, more efficient than MP3 and ubiquitous in modern streaming.
Apple Lossless Audio
Source formatALAC (Apple Lossless Audio Codec) provides lossless compression for audio, similar to FLAC but native to Apple ecosystem.
AAC Audio
Target formatAAC is a lossy audio codec that delivers better sound quality than MP3 at similar bitrates. It is the default audio format for Apple Music, YouTube, and most streaming services.
Why convert ALAC to AAC
Moving from ALAC to AAC usually buys compatibility or a friendlier file size. For spoken-word content the difference is inaudible; for high-resolution music pick the highest bitrate the AAC codec supports to avoid compounding compression.
HOW TO CONVERT
ALAC → AAC
Provide the audio file
Drag the ALAC onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
ffmpeg handles the conversion
Our ffmpeg-based pipeline reads sample rate and channel layout, then writes a matching AAC with ID3 tags intact.
Save the output
Click to download the AAC. Batch uploads are bundled into a ZIP for single-click retrieval.
Common Use Cases
Share across platforms
Send AAC files to anyone without worrying about whether they have the right software for ALAC.
Embed in documents
Drop AAC output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AAC often produces smaller files than ALAC for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
ALAC vs AAC — Strengths and limitations
What each format does best, and where it falls short.
ALAC Strengths
- Lossless — bit-exact with the original PCM.
- 40-60% smaller than uncompressed WAV/AIFF.
- Native Apple ecosystem support (iTunes, Apple Music Lossless).
- Open-source since 2011 — supported in FFmpeg, VLC, Android.
Limitations
- Non-Apple devices support ALAC but rarely make it the default.
- Slower encoding than FLAC on most reference implementations.
- Large files vs lossy alternatives (AAC).
AAC Strengths
- Better quality than MP3 at equal bitrate — the industry standard since 2000s.
- Universally supported on every smartphone, OS, and browser.
- Efficient on battery thanks to widespread hardware decoding.
- Scales from 8 kbps speech (HE-AACv2) to lossy-transparent 320 kbps.
- Five-channel + LFE surround support out of the box.
Limitations
- Patent-encumbered — encoders have licensing fees, which is why open alternatives (Opus, Vorbis) exist.
- Slightly more complex to encode than MP3.
- Raw .aac streams carry no seek index — tooling often prefers M4A/MP4 containers.
ALAC vs AAC — Technical specifications
Side-by-side comparison of the technical details.
ALAC
- MIME type
- audio/mp4 (inside .m4a)
- Extensions
- .m4a (common), .alac
- Container
- ISO Base Media File Format (like MP4)
- Sample rates
- Up to 384 kHz (hi-res); typical 44.1-192 kHz
- License
- Apache 2.0 (since 2011)
AAC
- MIME type
- audio/aac
- Extensions
- .aac, .m4a, .mp4 (container-dependent)
- Sample rates
- 8-96 kHz
- Standard
- ISO/IEC 14496-3
- Variants
- AAC-LC, HE-AAC, HE-AACv2, AAC-LD, xHE-AAC
| Specification | ALAC | AAC |
|---|---|---|
| MIME type | audio/mp4 (inside .m4a) | audio/aac |
| Extensions | .m4a (common), .alac | .aac, .m4a, .mp4 (container-dependent) |
| Container | ISO Base Media File Format (like MP4) | — |
| Sample rates | Up to 384 kHz (hi-res); typical 44.1-192 kHz | 8-96 kHz |
| License | Apache 2.0 (since 2011) | — |
| Standard | — | ISO/IEC 14496-3 |
| Variants | — | AAC-LC, HE-AAC, HE-AACv2, AAC-LD, xHE-AAC |
ALAC vs AAC — Typical file sizes
Approximate file sizes for common scenarios.
ALAC
- 3-min song (CD quality) 20-30 MB
- Full album (CD, 10 tracks) 250-400 MB
- Hi-Res 24-bit/96 kHz song 80-120 MB
AAC
- Speech podcast (64 kbps) 1 MB/min
- 3-min music track (128 kbps) 3 MB
- 3-min music track (256 kbps) 6 MB
- Broadcast-quality 5.1 (384 kbps) 9 MB for 3 min
Quality & Compatibility
Sample rate, channel layout and bit depth are preserved by default: a 44.1 kHz stereo ALAC becomes a 44.1 kHz stereo AAC. Metadata — title, artist, album, cover art — travels where both formats support it. Protected DRM content cannot be converted legally and is rejected.
Tips for Best Results
- Check the podcast host specification before choosing bitrate — some mandate CBR 64 kbps, others accept VBR up to 192 kbps.
- Preserve ID3 tags by editing them before conversion; Mp3tag and MusicBrainz Picard handle round-tripping cleanly.
- If the ALAC is 24-bit studio audio, the AAC at 16-bit is sufficient for listening; higher is wasted on consumer playback gear.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for AAC and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the ALAC container to the AAC container automatically where both formats support them. If a tag field has no AAC equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
AAC Audio Format: The Complete Technical Guide
Complete technical guide to AAC: AAC-LC, HE-AAC v1/v2, AAC-ELD profiles, MDCT filter bank, TNS, PNS, joint stereo, bitrate reference, M4A vs ADTS containers, and FFmpeg libfdk_aac encoding commands.
Read guideAAC Format: Complete Guide to Advanced Audio Coding (MPEG-4 Audio)
Complete guide to AAC audio format: AAC-LC vs HE-AAC profiles, M4A containers, Apple AAC vs FDK AAC encoders, quality comparison with MP3, and streaming bitrates.
Read guideM4A Format: MPEG-4 Audio — Apple Lossless, AAC & iTunes Explained
Learn what M4A files are, the difference between AAC and ALAC inside M4A, why Apple uses M4A instead of MP3, and how to convert M4A to MP3, FLAC, or WAV.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.