BTR AMP
To play lossless audio on an iPhone you need two things: a lossless source and a wired output. Apple Music subscribers turn on Lossless Audio in Settings. Your own lossless files play too — ALAC and AIFF through the built-in Music app, and FLAC (plus everything else) through a player app such as BTR AMP. Every wired output on an iPhone is lossless up to 24-bit/48 kHz; for hi-res above 48 kHz you need an external USB DAC. Bluetooth is never lossless, on any iPhone, with any headphones.
Lossless, hi-res, bit-perfect: three different claims
These terms get used interchangeably, and most of the confusion about lossless on iOS comes from mixing them up:
| Term | What it means | Where the iPhone stands |
|---|---|---|
| Lossless | A file format that reproduces the original samples exactly — FLAC, ALAC, WAV, AIFF. The opposite of MP3 and AAC, which discard data. | Supported. ALAC and AIFF natively; FLAC with a player app. |
| Hi-res | Lossless audio above CD resolution (16-bit/44.1 kHz) — typically 24-bit at 88.2, 96, 176.4 or 192 kHz. | Plays, but above 48 kHz only through a USB DAC. |
| Bit-perfect | The DAC receives the file’s samples unchanged — no resampling, EQ, or volume scaling anywhere in the chain. | Possible with a USB DAC and the right player. Full guide → |
Lossless describes the file. Hi-res describes its resolution. Bit-perfect describes the path from the file to the DAC. You can have the first without the other two — and a lot of “lossless” listening on iPhones is a lossless file, resampled by iOS, played over a lossy Bluetooth link.
Which iPhone outputs are actually lossless
This is the part most guides skip. Turning on lossless does nothing if the output throws it away:
| Output | Lossless? | Ceiling |
|---|---|---|
| Bluetooth — AirPods, Beats, any wireless headphones or speaker | No | iPhones send Bluetooth audio as AAC, which is lossy. There is no aptX or LDAC on iOS. |
| AirPlay | CD-quality at best | Fine for Apple Music lossless to a HomePod or compatible receiver; hi-res is downsampled, and nothing about AirPlay is bit-perfect. |
| Built-in speakers | Yes | 24-bit/48 kHz |
| Wired headphones via Apple’s USB-C or Lightning to 3.5 mm adapter | Yes | 24-bit/48 kHz — the adapter’s own DAC is the limit |
| AirPods Max (USB-C) over the USB-C cable | Yes | 24-bit/48 kHz |
| External USB DAC — plugged into USB-C, or a Lightning camera adapter on older iPhones | Yes | Whatever the DAC supports: 24/192, 32/384 and beyond, plus DSD |
The single most common mistake is enabling Lossless Audio and then listening over AirPods. The stream is lossless; the last few centimeters aren’t.
Option 1: Apple Music lossless
If your music comes from Apple Music, the whole catalog is available lossless at no extra cost. It’s off by default:
- Open Settings → Apps → Music (on older iOS versions, Settings → Music).
- Tap Audio Quality, then turn on Lossless Audio.
- Choose a quality for each connection — Cellular Streaming, Wi-Fi Streaming, and Downloads: Lossless (up to 24-bit/48 kHz) or Hi-Res Lossless (up to 24-bit/192 kHz).
- Plug in. Lossless needs a wired output from the table above, and Hi-Res Lossless needs an external DAC — Apple’s own support page says so.
- Songs you already downloaded stay at their old quality until you delete and re-download them.
Expect several times the data of standard AAC, especially at Hi-Res. The now-playing screen shows a Lossless or Hi-Res Lossless badge; tap it to see the resolution of the stream. The badge tells you what Apple is sending, not what is reaching your headphones — that depends on the output.
Two limits worth knowing. Apple Music lossless is a stream, not a file: it plays only while you subscribe, and it’s DRM-protected, so it can’t be opened in another player. And the Music app has no readout of its output sample rate and no bit-perfect setting, so with a USB DAC you can’t confirm from the app what the DAC is receiving.
Option 2: Your own lossless files
CD rips, Bandcamp and HDtracks purchases, needle-drops, live recordings — files you own are the other half of lossless on iOS, and the half that stays yours when a subscription lapses.
ALAC, AIFF, and WAV: the Music app route
Apple’s Music app plays Apple’s lossless formats. Add ALAC, AIFF, or WAV files to the Music app on a Mac (or Apple Devices / iTunes on Windows), then sync to the iPhone over USB or Wi-Fi. Playback is lossless up to the output’s ceiling, exactly as with Apple Music streams.
The trade-offs are the Music app’s: fixed Artists/Albums/Songs organization, no rules-based playlists on the device, re-syncing after every tag edit, and no FLAC at all.
FLAC and everything else: a player app
The Music app can’t open a FLAC file, and the Files app only previews one at a time with no library or queue. If your collection is FLAC — or mixed — a player app is the practical route, and it’s the shorter one: no conversion, no second copy of the library.
Using BTR AMP (free to download):
- Install BTR AMP from the App Store.
- Transfer your files. Open Connect → Wi-Fi Transfer and drag whole folders in from any browser on your computer, or pull from Google Drive, OneDrive, an SMB share, WebDAV, or a USB drive plugged into the phone. The importing guide covers each path.
- Press play. FLAC, ALAC, AIFF, APE, WavPack, TTA, and DSD all land in one library, next to your existing iTunes purchases. Every track shows its codec —
FLAC • 2.9 Mbps • 24 bit • 96.0 kHz— so you can see at a glance what’s lossless and what isn’t.
Files play natively at their own resolution. Over the phone’s built-in output or Apple’s adapter, iOS resamples anything above 48 kHz, as it does for every app; through a USB DAC, BTR AMP switches the DAC to each track’s sample rate, so a 96 kHz file plays at 96 kHz. The FLAC guide goes deeper, including the FLAC-to-ALAC conversion route if you’d rather stay in the Music app.
Hi-res: when you need a USB DAC
Everything in the iPhone’s own audio path tops out at 24-bit/48 kHz, which is why Apple’s lossless tier stops there and the hi-res tier requires outside hardware. A USB DAC (digital-to-analog converter) replaces the phone’s internal converter with one that accepts higher rates.
- Connection. iPhone 15 and later: plug the DAC straight into the USB-C port. iPhone 14 and earlier: use Apple’s Lightning to USB Camera Adapter (the USB 3 version has a power pass-through for hungrier DACs).
- Compatibility. iOS has no custom audio drivers, so the DAC must be USB Audio Class compliant — essentially every current DAC and dongle is. Nothing to install.
- Power. Bus-powered dongle DACs run from the phone. Larger desktop DACs may need their own supply or a powered hub, particularly over Lightning.
- Spec sheet. Check the maximum PCM rate (192, 384, 768 kHz), and if you own DSD, the maximum DoP rate — the DSD guide explains why those two numbers are linked.
A DAC on its own isn’t enough: the player has to ask iOS to run the DAC at the file’s rate, or iOS keeps whatever rate it was already at and resamples. That request-per-track behavior, and switching off EQ and normalization, is the difference between hi-res and bit-perfect hi-res — the bit-perfect guide covers the full setup.
How to check you’re really getting lossless
- Apple Music: tap the badge on the now-playing screen. Remember it describes the stream.
- BTR AMP: the now-playing screen can show both Input Specs (the file’s codec, bit depth, and sample rate) and Output Specs (the device iOS is playing to, and the rate it’s running at — enable both under the player’s ⋯ → Display menu). If the output rate doesn’t match the file, iOS is resampling — a 96 kHz file through Apple’s 3.5 mm adapter shows 48 kHz out, for instance.
- Your DAC: many show the incoming sample rate on a display or by LED color. That indicator is the ground truth, because it’s reading the USB stream itself.
FAQ
Does the iPhone support lossless audio? Yes. iOS plays ALAC, AIFF, and WAV natively, and Apple Music has streamed lossless since 2021. FLAC needs a third-party player. Lossless above 24-bit/48 kHz requires an external USB DAC.
Is Apple Music lossless the same as FLAC? Same idea, different container. Apple Music streams ALAC; FLAC is the open equivalent, and converting between the two loses nothing. The practical difference is ownership: FLAC files are yours and DRM-free, while Apple Music lossless plays only inside the Music app, only while you subscribe.
Can AirPods play lossless audio? Not over Bluetooth — iPhones send AAC, which is lossy. The exception is AirPods Max with USB-C, which play lossless up to 24-bit/48 kHz over the USB-C cable.
Do I need a DAC for lossless on iPhone? No for CD-quality and 24-bit/48 kHz: the built-in output and Apple’s 3.5 mm adapter handle those losslessly. Yes for anything above 48 kHz — the hi-res tier, 24/96 FLAC downloads, and DSD.
Can I play FLAC in the Apple Music app? No. Either convert FLAC to ALAC on a computer and sync, or use a player that reads FLAC directly — the FLAC guide walks through both.
Does lossless sound better than 256 kbps AAC? On most gear, in blind tests, the difference is small to inaudible. The case for lossless is less about tonight’s listening than about the file: it’s an exact copy, it never degrades through re-encoding, and it’s the only format worth keeping an archive in. Hi-res adds provenance — many hi-res releases are closer to the master than the CD.
How much space do lossless files take? Roughly three to four times AAC. A four-minute track runs about 8 MB at 256 kbps AAC, 25–30 MB as CD-quality FLAC or ALAC, and 60–100 MB at 24-bit/96 kHz. A large lossless library is the reason an offline player built for 50,000+ tracks matters.