AIFF vs FLAC: Which Format Should You Choose?

If you record voice, music, podcasts or audio for video, you will eventually have to choose a lossless format for masters and archives. AIFF and FLAC both preserve every sample of the original recording, so the choice is less about sound quality and more about storage, compatibility and how you edit and share files.

Define the alternatives

AIFF (Audio Interchange File Format) was introduced by Apple in the late 1980s. A standard AIFF file stores uncompressed PCM audio, the same raw sample data a recorder or audio interface captures. A variant called AIFF-C can hold compressed or floating-point data, but most files labelled AIFF are uncompressed.

FLAC (Free Lossless Audio Codec) is an open, royalty-free format maintained by the Xiph.Org Foundation. It compresses audio losslessly: the file is smaller than the uncompressed original, and decoding restores the exact same samples.

This comparison is for people deciding how to store or exchange finished or raw recordings, such as microphone takes, podcast episodes, music exports or audio tracks extracted from video. It does not cover lossy formats like MP3 or AAC, which discard data to save space.

Compare meaningful differences

Audio quality

At the same sample rate and bit depth, a FLAC file and an uncompressed AIFF file decode to identical audio. Any audible difference between two such files points to a problem elsewhere, such as different source material, a resampling step or playback settings, not the container format.

File size

Uncompressed AIFF size depends only on duration, sample rate, bit depth and channel count. FLAC files are usually considerably smaller, but the saving varies with the content: silence and simple material compress well, while dense, noisy recordings compress less. Check the actual sizes of your own files rather than relying on a fixed percentage.

Compatibility

AIFF is widely supported by audio editors, digital audio workstations and Apple software. FLAC is supported natively in current versions of Windows, Android and macOS, and by many media players and hardware streamers, but support inside specific apps varies. Apple's Music app, for example, has historically not imported FLAC directly. Because support changes between versions, confirm the import and export formats listed for the exact version of your editor, player or device.

Bit depth and sample formats

FLAC stores integer PCM audio and does not support 32-bit floating-point samples. AIFF-C can store floating-point data, though not every app reads it. If your recording software works in 32-bit float, exporting to FLAC converts the audio to integer samples, so choose the target bit depth deliberately.

Metadata and artwork

FLAC uses Vorbis comment tags and can embed artwork, and tagging tools handle it consistently. AIFF has no single universal tagging scheme; many apps store ID3 tags inside AIFF files, but some programs ignore or overwrite them. If titles, artist names or cover images matter, test that your library or editor reads the tags you write.

Integrity checking

A FLAC file can store a checksum of the decoded audio, which lets compatible tools verify that the audio has not been corrupted. Standard AIFF has no equivalent built-in audio checksum, so corruption checks rely on external tools or backup software.

Privacy and file handling

Both formats can carry metadata such as names, comments, recording software or dates. Before sharing a file, open it in a tag editor and remove anything you do not want to publish. If you convert files with an online service, you are uploading the recording to a third party; check that service's stated storage and deletion policy, or use a local converter instead.

Practical trade-offs

The published specifications tell you what each format can store. How quickly your computer opens, scrubs or exports large sessions depends on your hardware, storage and software, so treat performance as something to test on your own setup.

• Editing raw takes: uncompressed AIFF opens in almost any editor without decoding, which keeps a session simple if every tool in your chain supports it.
• Long-term archives: FLAC saves disk and backup space and adds a verifiable checksum, which helps when storing many hours of recordings.
• Sharing with collaborators: the safer format is the one their software opens. Ask before sending, especially if someone uses an older editor or a mobile app.
• Apple-centred libraries: AIFF fits smoothly into Apple's music software, while FLAC may need conversion or a third-party player.
• Cross-platform playback: FLAC is common on Android, Windows, Linux and many network players, so it travels well outside Apple apps.

Converting between the two is lossless as long as you keep the same sample rate and bit depth and the source is integer PCM. Metadata may not transfer cleanly, so check tags after any conversion.

Choose for the use case

• Choose AIFF if your editor, DAW or library is built around Apple software, you need files that open without decoding, or you work with floating-point audio that your tools read as AIFF-C.
• Choose FLAC if storage space matters, you want reliable tagging and built-in integrity checks, or you play files across Windows, Android, Linux and dedicated audio hardware.
• Keep both if needed: many people archive in FLAC and convert copies to AIFF only when a specific app requires it.
• Verify before committing: export a short test clip in each format and confirm that every app and device in your workflow opens it and shows the tags you expect.

Neither format sounds better than the other. The right choice is the one your software supports reliably and that fits how much storage you have and how you organise and share your recordings.