AAC to ALAC Converter
Convert AAC files to ALAC format online for free. No installation or registration required.
Quick Answer: How to Convert AAC to ALAC
AAC is the successor codec to MP3 in the MPEG family, with better perceptual coding, while ALAC is Apple Lossless — FLAC's counterpart inside the MP4/M4A container. Converting AAC to ALAC wraps or re-encodes your audio into the ALAC structure, but be aware: quality lost when the AAC was created stays lost — a ALAC made from a lossy source is a perfect copy of an imperfect original. Run it free at practicalwebtools.com/convert/audio/aac-to-alac: drop in your AAC, adjust settings if you like, and download the ALAC — no signup, no upload, everything stays on your device.
AAC vs ALAC: Which One and Why
AAC is the successor codec to MP3 in the MPEG family, with better perceptual coding, standardized in 1997 as MPEG-2 Part 7, extended in MPEG-4. ALAC is Apple Lossless — FLAC's counterpart inside the MP4/M4A container, released by Apple in 2004; open-sourced under Apache 2.0 in 2011. People reach for AAC mainly for Apple Music and iTunes libraries, YouTube audio, iPhone voice memos (.m4a), while ALAC is the usual choice for Apple Music lossless streaming, ripping CDs for the Apple ecosystem, iPhone/local-library audiophile setups. AAC's headline strength: better quality than MP3 at the same bitrate. ALAC's: perfect fidelity inside the iTunes/Apple Music pipeline. On the other side of the ledger, AAC limitation: quality edge narrows above 192 kbps — and ALAC limitation: no advantage over FLAC outside the Apple world.
How to Convert AAC to ALAC Online
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Add your AAC file: Drag and drop it into the converter, or click to browse. AAC files up to the size limit are accepted, and nothing is uploaded — processing runs locally in your browser.
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Set ALAC options: The converter re-encodes into ALAC, which is lossless — roughly 40–60% of original size, comparable to FLAC. Set quality to maximum since you're going lossless — no reason to trim bits you already have.
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Download the ALAC: Conversion runs on your device. When it completes, download the ALAC file — repeat for as many files as you need, free and unlimited.
Key Facts
- AAC: standardized in 1997 as MPEG-2 Part 7, extended in MPEG-4, lossy — roughly MP3 quality at 25–30% lower bitrate (e.g. 128 kbps AAC ≈ 160–192 kbps MP3).
- ALAC: released by Apple in 2004; open-sourced under Apache 2.0 in 2011, lossless — roughly 40–60% of original size, comparable to FLAC.
- Converting AAC → ALAC cannot restore what the AAC encoding already discarded — the ALAC is a faithful copy of the AAC, not of the original recording.
- AAC strength: better quality than MP3 at the same bitrate.
- ALAC strength: perfect fidelity inside the iTunes/Apple Music pipeline.
- AAC limitation to know: quality edge narrows above 192 kbps.
- ALAC limitation to know: no advantage over FLAC outside the Apple world.
- Fun fact: Apple Music streams ALAC up to 24-bit/192 kHz — but AirPods re-compress it to AAC over Bluetooth, so lossless is only audible on wired or Wi-Fi playback
Format Background
AAC
AAC — standardized in 1997 as MPEG-2 Part 7, extended in MPEG-4. AAC supports up to 48 channels; MP3 tops out at 2 — the reason surround audio moved to AAC early
ALAC
ALAC — released by Apple in 2004; open-sourced under Apache 2.0 in 2011. Apple Music streams ALAC up to 24-bit/192 kHz — but AirPods re-compress it to AAC over Bluetooth, so lossless is only audible on wired or Wi-Fi playback
Frequently Asked Questions
Will converting AAC to ALAC lose quality?
The ALAC output preserves everything present in your AAC file — but AAC is lossy — roughly MP3 quality at 25–30% lower bitrate (e.g. 128 kbps AAC ≈ 160–192 kbps MP3), so information discarded when that file was made is gone for good. You get a bit-perfect copy of what you have, not a restoration of the original recording.
Are my files uploaded anywhere during AAC → ALAC conversion?
No. This converter runs on WebAssembly inside your browser — your AAC file is read from disk, processed by your device's CPU, and the ALAC is written back locally. There is no server upload at any point, which also means no size-based throttling or waiting in queue.
Does converting AAC to ALAC restore lost quality?
No — and this trips up a lot of people. AAC is lossy — roughly MP3 quality at 25–30% lower bitrate (e.g. 128 kbps AAC ≈ 160–192 kbps MP3): the data it discarded at creation time cannot be reconstructed by any converter. A ALAC from a AAC source sounds exactly as good as the AAC, no better. The reasons to convert anyway are compatibility, editing headroom, and future-proofing — not restoration.
What devices and apps play ALAC files?
iOS, macOS, iTunes, Apple TV, HomePod; most modern browsers via MSE. No advantage over FLAC outside the Apple world — worth knowing before you standardize on it.
Can I convert several AAC files at once?
Yes — the converter processes a queue of files in one session, each entirely on your device. Batch mode is handy when moving a library into ALAC; just remember each file re-encodes independently, so set your quality once and it applies to all.
Related Converters
Further reading
Guides and explainers on the Practical Web Tools blog cover audio and video formats in depth — or browse every audio converters pair from the hub.