What format do iPhone Voice Memos use?

M4A is the container in both quality modes. Inside the container, Compressed quality writes AAC at roughly 64 kbps mono — small files, fine for speech. Lossless quality writes ALAC (Apple Lossless Audio Codec) at 44.1 or 48 kHz, 16-bit, stereo when the input supports it. ALAC is mathematically lossless: the file is a compressed but bit-perfect representation of the input PCM, and decoding it returns the exact original samples. Lossless files are roughly 20 times larger than Compressed but preserve every detail. To switch, Settings, Voice Memos, Audio Quality. Existing files keep whatever quality they were captured at — there is no upgrade path.

How do I record a phone call on iPhone in 2026?

There is no built-in way and no workaround that uses only the iPhone itself. iOS does not expose a system-audio capture API, which is a deliberate Apple privacy decision. The practical options are speakerphone plus a second recording device (an old iPhone running Voice Memos works fine), a hardware Bluetooth call recorder (iRecorder Pro, RecorderGear PR200) that pairs as a headset and stores the call, or a third-party conference-bridge service like TapeACall or Rev Call Recorder. The conference-bridge services start at $5/month and route calls through a server that does the recording. Most US states and EU countries require explicit consent from all parties — get permission before pressing record.

Can I record system audio on iPhone?

No. iOS sandboxing prevents any app from capturing other apps' audio output, and unlike macOS there is no virtual-audio-device escape hatch. You cannot record a Spotify song, a YouTube video, an Apple Music track, or another app's audio directly on iPhone. The workarounds are AirPlay or screen-mirror to a different device that can record, or capture the audio at the source and bring it to the iPhone afterward. For YouTube specifically, the cleanest path is to extract audio later from a downloaded video — see [how to extract audio from video](/blog/how-to-extract-audio-from-video) and the [mp4-to-mp3](/mp4-to-mp3) tool for the conversion step.

How do I share a Voice Memo as MP3?

Voice Memos exports as M4A, which most platforms accept. If you specifically need MP3 (some podcast hosts, some legacy chat apps, some embedded players), open Safari on the iPhone, go to [m4a-to-mp3](/m4a-to-mp3), tap Choose File, pick the Voice Memo from Files or share it directly from Voice Memos. The conversion runs locally in the browser using WebAssembly ffmpeg — your audio never uploads to a server. Download the resulting MP3 back to Files. The whole flow takes about 30 seconds for a typical voice memo. For more detail and the full workflow see [how to convert a Voice Memo to MP3](/blog/how-to-convert-voice-memo-to-mp3).

Where are Voice Memos stored?

Inside the Voice Memos app, with the underlying M4A files in a sandboxed app container that is not directly user-accessible from Files (unless you tap more..., Show Recording in Files first). With iCloud sync enabled (Settings, Voice Memos, Sync to iCloud), recordings also live in your iCloud Drive and appear on every Apple device signed into your account. Without iCloud sync, recordings are local-only and back up via full iCloud Backup or encrypted device backup to a Mac. iCloud Backup does include Voice Memos by default — to exclude them, Settings, Apple ID, iCloud, iCloud Backup, Manage Storage.

Why is my Voice Memo quality poor?

Default Compressed quality writes AAC at roughly 64 kbps mono, which is fine for spoken notes but thin for music, interviews you plan to transcribe, or anything where high-frequency detail matters. Settings, Voice Memos, Audio Quality, switch to Lossless. New recordings will use M4A ALAC at 44.1 or 48 kHz, 16-bit, with no perceptual compression. Existing files cannot be retroactively improved — quality lost in the AAC encoder is gone. Other quality factors: hold the iPhone close to the source, avoid covering the bottom mic with your hand, prefer the built-in mic over Bluetooth headsets (Bluetooth uplink caps mic quality at roughly 32-64 kbps regardless of the Voice Memos setting).

Can I record longer than 1 hour?

Yes. Voice Memos has no time limit. The constraints are storage and battery. A one-hour Lossless recording is roughly 600 MB; a four-hour recording is around 2.4 GB. Battery drain is roughly 8-10% per hour while recording on iPhone 15 and later, so a four-hour session uses about 30-40% of a full charge. For long sessions, plug in the charger, disable Auto-Lock (Settings, Display and Brightness, Auto-Lock, Never), and keep the phone face-down to dampen vibration noise. Voice Memos handles multi-hour files cleanly — the only quirk is a few-second waveform render delay the first time you open a long recording.

How to Record Audio on iPhone: 2026 Guide

iPhone is, for most people, the recording device they actually carry. Voice Memos has been pre-installed since iOS 3 in 2009 and has steadily picked up features that the typical user never discovers — Lossless quality, in-app trimming, multi-track replace, iCloud sync, hands-free Apple Watch capture. This guide covers what Voice Memos can and cannot do in 2026, the formats and bitrates it actually writes, the legal and technical reasons phone-call recording remains impossible without third-party hardware, and the in-Safari workflow for trimming and converting recordings without leaving your phone.

Voice Memos: The Default and Surprisingly Capable

Voice Memos is free, pre-installed, and unlimited (no per-recording time cap). Open the app, tap the large red record button, tap to stop. The recording appears in the list with an auto-generated location-based name (which you can disable in Settings, Voice Memos, Location-based Naming).

Tap any recording to expand it. Tap the play button to listen. Tap the three-dots menu (more...) for Save to Files, Share, Edit Recording, Duplicate, and Delete. The menu is also where you find Show Recording in Files (which exposes the underlying M4A file in the Files app for direct manipulation).

Format and Quality

Settings, Voice Memos, Audio Quality, two options:

Compressed (default): M4A AAC, roughly 64 kbps mono, 22.05 kHz internal sample rate. A one-hour recording is about 28 MB. Fine for spoken notes; thin for music or anything where you care about high-frequency detail.
Lossless: M4A ALAC at 44.1 kHz or 48 kHz (matching the input device), 16-bit. A one-hour recording is roughly 600 MB. Use this for interviews you plan to transcribe, lectures, music recordings, anything you want to archive at full fidelity.

The two settings only affect new recordings; existing files retain whatever quality they were captured at. If you started a recording in Compressed and later switch to Lossless, only future recordings benefit. There is no upgrade path for existing files — quality lost in the AAC encode cannot be recovered. For background on what the difference actually means in audible terms see lossless vs lossy.

In-App Trimming and Editing (Most Users Miss This)

Open a recording. Tap the more... menu, then Edit Recording. The waveform editor appears. Tap the trim icon (the rectangle with vertical lines) at the top right. Drag the yellow handles to select the keep region; tap Trim to crop everything outside, or Delete to cut out the selected region instead.

Replace works in the same editor. Tap inside the waveform to position the playhead, then tap the red record button — Voice Memos starts recording at the playhead and overwrites the original. Useful for fixing a flubbed sentence in an otherwise-good take.

The editing is non-destructive only until you tap Save in the top right. After Save, the original is gone. To preserve the source, Duplicate the recording first (more... menu, Duplicate) and edit the copy.

iCloud Sync

Settings, Voice Memos, Sync to iCloud. With this on, every recording uploads to your iCloud Drive and appears on every Apple device signed into the same Apple ID — Mac, iPad, other iPhones. The sync is automatic and uses end-to-end encryption with Advanced Data Protection enabled, otherwise standard at-rest encryption.

With sync off, recordings stay local on the iPhone and back up only as part of full iCloud Backup or device-to-device transfer.

What Voice Memos Cannot Do

Phone Call Recording

There is no built-in way to record a phone call on iPhone in 2026. iOS does not expose a system-audio API to apps, which means no app — first-party or otherwise — can capture the audio of a normal phone call or a FaceTime call. Apple has been explicit that this is a deliberate privacy boundary and there is no roadmap to change it.

The workarounds:

1. Speakerphone plus a second device. Put the call on speaker, hold a second iPhone (or any recording device) close to the speaker, record on the second device. Quality is lossy and ambient, but it works. 2. Hardware Bluetooth recorder. Devices like the iRecorder Pro, RecorderGear PR200, and similar plug into the headphone jack (via a Lightning or USB-C adapter) and record both sides of a call. Some pair via Bluetooth and act as a headset that also stores the call. 3. Third-party services. Apps like TapeACall and Rev Call Recorder bridge the call through a conference-call line, which is what makes recording legally possible — the recording happens on the conference server, not on the phone. They start at around $5/month. They also explicitly notify both parties at call start.

Recording a call without consent is illegal in many US states and most of Europe — get explicit consent before pressing record, regardless of method.

System Audio Capture

iOS sandboxing prevents apps from capturing other apps' audio output, same architectural reason as macOS but with no virtual-device escape hatch. You cannot record a Spotify song, a YouTube video's audio, or another app's output directly on iPhone. The workaround is the same as for calls: speakerphone or AirPlay to a different device that can record. For YouTube specifically, AirPlay to a Mac running QuickTime plus BlackHole, or extract the audio later via mp4-to-mp3 or mov-to-mp3 using the workflow in how to extract audio from video.

Microphones: Built-In, AirPods, External

The built-in iPhone mic array (three or four mics depending on model) is excellent for speech and decent for music. iPhone 13 and later use spatial audio capture in Voice Memos when iOS detects a stereo source, though only the Lossless quality preserves the full spatial information.

AirPods and other Bluetooth headsets work as Voice Memos input, but the bitrate of the Bluetooth uplink (SBC at roughly 32 kbps mono, sometimes mSBC at 64 kbps for newer codecs) caps the captured quality regardless of the Audio Quality setting. For interviews or anything where audio quality matters, prefer the built-in iPhone mic over AirPods. The iPhone is also more directional for speech because the mic array beamforms toward the speaker.

For real recording quality, a Lightning or USB-C external mic — Shure MV88, Rode VideoMic Me-L, Apogee MiC Plus — bypasses Bluetooth and gives you a proper input. Voice Memos auto-detects the external mic; no configuration required.

Sharing and Converting

The export menu (more..., Share) sends the recording to other apps as an M4A file: AirDrop to Mac, Messages, Mail, third-party apps. For most podcast hosts, transcription services, and chat platforms that prefer MP3, run the M4A through m4a-to-mp3 — the page works in Safari on iPhone, the conversion runs locally on the phone via WebAssembly, and the file never uploads to any server. Background on the format itself lives in what is M4A and how to convert a Voice Memo to MP3 walks through the whole process step by step. The general iOS conversion workflow is covered in how to convert audio on iPhone.

For trimming beyond what Voice Memos provides, audio-trimmer and audio-cutter both work in mobile Safari. Drag the M4A from the Files app or Voice Memos export into the page, edit, download. Same for audio-compressor when a Lossless recording is too large to email or Slack.

Long-Form Recording

There is no time limit in Voice Memos. The constraints are storage (a 4-hour Lossless recording is around 2.4 GB) and battery (recording for 4 hours drains roughly 30-40% of a fresh battery on iPhone 15 and later). For interviews, lectures, and meetings:

Plug in the charger if you can.
Switch to Lossless quality — the storage cost is worth the headroom for transcription accuracy.
Disable Auto-Lock during the session (Settings, Display and Brightness, Auto-Lock, Never) so the screen does not dim and trigger any battery-saving audio interruption.
Keep the iPhone face-down on a soft surface to reduce vibration noise picked up by the bottom-mounted mic.

After a long recording, Voice Memos can take a few seconds to render the waveform on first open — that is normal, not a sign of corruption. iCloud sync also takes longer for bigger files; expect a 4-hour Lossless file to take 5-15 minutes to appear on other devices over a typical home connection.

Summary

Voice Memos in Lossless mode is genuinely good — better than most casual users realize. Use it for everything except phone calls (impossible without hardware) and pure system audio (also impossible). For anything that needs to leave the iPhone as MP3 or needs more aggressive editing than the built-in trimmer offers, the AudioUtils browser tools handle the conversion and edits without uploading the file anywhere. The whole pipeline can stay on the phone.