AIFF to FLAC Converter

Convert AIFF to FLAC Online

AIFF stores audio as uncompressed PCM, so a few minutes of music can run to tens of megabytes. Converting to FLAC keeps every sample bit-for-bit identical — it is a lossless-to-lossless conversion with zero quality loss — while typically shrinking the file to roughly half its original size. You also gain FLAC's richer tagging, which is handy for large music libraries.

How to Convert AIFF to FLAC

1. Upload Your AIFF File: Drag and drop your .aiff or .aif file onto the page, or click "+ Add Files" to browse. You can queue several files and convert them in one batch.
2. Set the Compression Level: Open Advanced Options and use the Compression level slider. A higher level produces a smaller file and takes longer to encode; it never changes the audio, since FLAC decodes back to the exact original PCM.
3. Adjust Audio Sample Rate or Channel (Optional): Leave Audio Sample Rate and Audio Channel on "Original" to preserve the source exactly, or change them if you specifically need to resample or downmix. You can also set Trim to export only part of the track.
4. Convert and Download: Click "Convert" and download your FLAC file. No sign-up, no watermark.

AIFF vs FLAC at a Glance

When to Keep AIFF Instead

Not every library benefits from the switch. If your files live inside Logic Pro sessions, GarageBand projects, or an Apple Music workflow, AIFF is the native citizen — every Apple app opens it instantly, and converting to FLAC would add a format Apple's own players don't read. Convert to FLAC when the goal is storage: archiving masters compactly, moving a library to a NAS or non-Apple player, or sharing lossless files with people outside the Apple ecosystem. Because the conversion is lossless in both directions, you can also keep AIFF as the working format and FLAC as the archive copy without ever losing a sample.

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Frequently Asked Questions

Which settings can make this conversion not lossless?

Three, and they're all optional. Changing Audio Sample Rate from Original resamples the waveform; switching Audio Channel to Mono downmixes it; and Trim exports only part of the track. Each of those genuinely alters the samples, so the output is no longer a sample-exact copy of the source. For an archival conversion, leave all three on their defaults — then the only thing that changes is how the identical audio is stored.

Should I archive in FLAC or ALAC?

Both are lossless, so the audio is equivalent — the difference is ecosystem. ALAC (Apple Lossless) plays natively in Apple's Music app and on iPhones, while FLAC has broader support everywhere else: dedicated audio players, DAPs, Plex/Jellyfin servers, and Android. If your library lives in Apple software, ALAC saves friction; if it lives anywhere else — or you want the most widely supported open format — FLAC is the safer archive.

Will I lose any audio quality converting AIFF to FLAC?

No. Both AIFF and FLAC are lossless, so the conversion is lossless end to end. FLAC compresses the PCM data the way a ZIP file compresses a document — when the file is decoded for playback, the waveform is bit-for-bit identical to the original AIFF. The only thing that changes is the file size on disk.

How much smaller will the FLAC file be than the AIFF?

It depends on the music — dense, complex audio compresses less than sparse or quiet recordings — but FLAC commonly lands around half the size of the uncompressed AIFF source. In our testing, a 16-bit/44.1 kHz stereo album that was roughly 300 MB as AIFF came down to about 180 MB as FLAC with no change to the audio. A higher Compression level squeezes out a little more.

Can I play FLAC files in iTunes or Apple Music?

Not natively. Apple's apps (iTunes, the Music app, older iPods) do not support FLAC playback; Apple's own lossless format is ALAC. If you live entirely inside the Apple ecosystem you may prefer to keep your AIFF files or use ALAC. FLAC plays natively in VLC, foobar2000, and most modern non-Apple players and DAPs.

Does the compression level affect how the FLAC sounds?

No. The Compression level slider only trades encoding time against file size. Every level produces a perfectly lossless file that decodes to identical audio — a higher level just works harder to make the file a bit smaller. There is no "audio quality" setting to lose, because nothing is ever discarded.

Will my metadata and tags carry over from AIFF to FLAC?

FLAC supports rich Vorbis-comment tags and embedded cover art, so it can hold more metadata than AIFF, whose tagging is more limited and inconsistent between applications. Any standard tags present in the AIFF are preserved where a direct equivalent exists; if you need to go the other direction, see FLAC to AIFF. For a universally playable lossy copy instead, use AIFF to MP3.

Are my uploaded files kept private?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.