The best audio format for most people is FLAC for a lossless music library, with AAC or MP3 copies when compatibility or smaller files matter. The caveat is platform control: Apple Music, Spotify, TIDAL, Deezer, Qobuz, YouTube, and SoundCloud each have their own codec, upload, and quality rules.
Use ALAC when your library stays inside Apple Music or iTunes. Use Opus for modern web or app streaming only when you control playback support, and use the official format required by a platform when you are exporting or uploading there.
The Default Answer
For a local library, keep FLAC as the master format because it preserves lossless audio and has better direct browser support than ALAC. If you are managing Apple Music Lossless on iPhone or iPad, the current path is Settings > Apps > Music > Audio Quality > Lossless Audio, then choose Lossless or Hi-Res Lossless for streaming and downloads. Apple lists Lossless up to 24-bit/48 kHz and Hi-Res Lossless up to 24-bit/192 kHz, with external DAC hardware needed in some Hi-Res paths.
Choose By Use Case
Long-term music library: Choose FLAC because it keeps the source lossless and is the safest general archive choice.
Apple-only library: Choose ALAC because Apple Music on Mac and iTunes for Windows support Apple Lossless conversion and playback inside that ecosystem.
Maximum everyday compatibility: Choose MP3 when files need to play on phones, computers, car stereos, and portable players with the fewest surprises.
Smaller files with better quality at a similar bitrate: Choose AAC when your target device or platform supports it; Microsoft says AAC generally delivers better sound quality than MP3 at similar bit rates.
Modern web or app streaming: Choose Opus when support is verified; MDN recommends Opus for most WebCodecs audio encoding use cases.
YouTube video export: Choose AAC-LC at 48 kHz as the safe general export setting. YouTube's recommended upload encoding settings list AAC-LC, Opus, or Eclipsa Audio at 48 kHz, but that page opens by saying those features are only available to partners who use YouTube Studio Content Manager.
Quality And Compression
FLAC and ALAC are lossless library formats, while AAC, MP3, and Opus are compressed formats for smaller files or streaming delivery. WAV and AIFF are also lossless, but they are better treated as large editing or interchange files rather than compact everyday library formats. On compatible Macs, the built-in headphone output sample rate can be matched to high-resolution source material in Applications > Utilities > Audio MIDI Setup > Audio Devices > External Headphones > Format.
Platform Requirements
Apple Music: Turn on Lossless in the Apple Music app or device music settings; ordinary Bluetooth paths are not lossless, including AirPods, AirPods Pro, AirPods Max, Beats wireless headphones, and other Bluetooth connections.
Spotify: Use Media Quality settings in the mobile, tablet, or desktop app; Spotify lists Lossless as up to 24-bit/44.1 kHz FLAC and gates it behind Premium, a lossless-capable device, and a supported app version, currently mobile 9.0.58 or above or desktop 1.2.67 or above. The Spotify web player does not offer a music quality adjustment.
TIDAL: Choose Low, High, or Max in Audio Quality settings. TIDAL says MQA and 360 Reality Audio are no longer accessible as of July 24, 2024; current stereo support is FLAC, with Dolby Atmos for immersive playback.
Deezer: Choose Standard, High Quality, or High Fidelity. Deezer lists HiFi as 1411 kbps FLAC, while lower listed tiers use MP3.
Qobuz: Use Hi-Res or CD quality for FLAC streaming. CD quality is 16-bit/44.1 kHz FLAC, while the Hi-Res catalogue up to 24-bit/192 kHz comes with the Studio and Sublime plans, and Qobuz says the maximum achievable streaming quality also depends on your subscription and on the quality the labels supply. For purchased downloads, Qobuz offers WAV, AIFF, ALAC, and FLAC for lossless qualities.
SoundCloud: Go+ High Quality streaming is 256 kbps AAC on eligible tracks. For creator uploads, SoundCloud recommends WAV, FLAC, AIFF, or ALAC source files.
YouTube Music: Download quality can be Low, Normal, or High, listed by Google as 48 kbps, 128 kbps, or 256 kbps AAC or Opus.
Apple Music Settings
On iPhone or iPad, go to Settings > Apps > Music > Audio Quality > Lossless Audio, then choose Lossless or Hi-Res Lossless for streaming and downloads.
On Mac, open Apple Music app > Music > Preferences > Playback, then select Lossless audio under Audio Quality and choose streaming or download quality.
On Apple TV 4K, use Settings > Apps > Music > Audio Quality > Lossless. Apple TV 4K supports Lossless but not Hi-Res Lossless above 48 kHz.
On HomePod, use Home app on iPhone or iPad > Home button > Home Settings > your name > Apple Music > Lossless Audio.
On Android, open Apple Music app > More button > Settings > Audio Quality > Lossless, then choose Lossless or Hi-Res Lossless.
On Windows PC, use Apple Music app > Sidebar Actions > Settings > Playback, then turn Lossless audio on or off under Audio Quality.
Delete and redownload Apple Music downloads after switching to Lossless, because previously downloaded music keeps its old quality.
Uploading And Exporting
YouTube Music personal library: Upload FLAC, M4A, MP3, OGG, or WMA at music.youtube.com by dragging files onto the page or using profile picture > Upload music.
YouTube video uploads: Export a supported video file with AAC-LC audio at a 48 kHz sample rate. The full AAC-LC, Opus, or Eclipsa Audio recommendation is published for partners who use YouTube Studio Content Manager, so treat the Opus and Eclipsa options as partner-workflow guidance rather than a requirement for an ordinary upload.
SoundCloud creator uploads: Upload WAV, FLAC, AIFF, or ALAC for best post-transcode quality, with source quality at 16-bit/44.1 kHz or higher.
Qobuz purchased downloads: Choose WAV, AIFF, ALAC, or FLAC for purchased hi-res or CD-quality downloads according to your playback or editing setup.
Bluetooth And DAC Playback
This fixes the format mistake of choosing lossless but playing it through a non-lossless path.
Do not expect Apple Music Lossless over ordinary Bluetooth; Apple states Bluetooth connections are not lossless.
Use wired headphones, compatible built-in speakers, or supported lossless-capable Apple devices when lossless playback is the goal.
Use an external DAC when a Hi-Res Lossless path above 48 kHz requires one.
On TIDAL desktop for PC or Mac, connect a compatible DAC and use Settings > Streaming > Sound Output > More Settings > Exclusive Mode when you want TIDAL to control the audio device directly.
On compatible Windows 11 Bluetooth LE Audio devices, use Settings > System > Sound > Bluetooth LE Audio device > Output settings > Format to choose the format used when the microphone is active.
Editing And Conversion
Keep the master in FLAC for a general library or ALAC for an Apple-only library before making smaller copies.
Use WAV or AIFF when an editor, mastering tool, or delivery workflow expects a large uncompressed interchange file.
Create AAC or MP3 copies when file size, car playback, portable players, or simple sharing matter more than preserving the full source.
In Apple Music on Mac or iTunes for Windows, choose the import settings and encoder, select the songs, then use File > Convert > Create [format] Version.
Use Apple’s listed conversion targets only where available for your app and version: AAC, AIFF, Apple Lossless, MP3, or WAV.
Convert from a lossless master instead of from an already compressed copy whenever that source is available.
The Practical Verdict
Use FLAC for a long-term music library, ALAC for an Apple-only library, AAC for efficient everyday files, MP3 for maximum compatibility, and Opus for modern web or app streaming when support is verified. Platform rules override the general answer, especially YouTube’s video export codecs, SoundCloud’s upload recommendations, Spotify’s app-only quality controls, and Apple Music’s Bluetooth limitation. On current Windows 11 builds, the quick route to system audio controls is Windows logo key + Ctrl + V for the enhanced volume mixer.
Frequently Asked Questions
Is FLAC better than MP3 for music?
FLAC is better for preserving quality because it is lossless. MP3 is better when you need smaller files and the broadest playback compatibility.
Should I choose AAC or MP3?
Choose AAC when the target device or service supports it and quality at a similar bitrate matters. Choose MP3 when maximum compatibility is the priority.
Is ALAC better than FLAC for Apple Music?
ALAC is the better fit for an Apple-only library because Apple Music and iTunes support Apple Lossless conversion. FLAC is the safer general lossless format outside that Apple-focused setup.
Can Bluetooth play Apple Music Lossless?
Not over ordinary Bluetooth. Apple says Bluetooth connections are not lossless, so use a wired path, compatible built-in speakers, or supported lossless-capable devices.