Following spoken dialogue in noisy environments, understanding fast-paced podcasts without headphones, or participating in phone calls can be challenging for users who are deaf, hard of hearing, or studying in quiet spaces. In iOS 16 and later, Apple introduced Live Captions—an advanced on-device machine learning accessibility tool that automatically transcribes spoken audio into real-time text captions. Whether streaming YouTube videos, listening to voice messages, or chatting on FaceTime, Live Captions delivers instantaneous subtitles without sending audio data to external servers.
How Live Captions Operates on iOS
Live Captions integrates directly into core audio output frameworks across iOS:
- Universal System Audio Transcription: Captions any audio playing through your iPhone speakers—including social media videos, streaming films, podcasts, and third-party media players.
- Live Call Captions: Transcribes live conversations during traditional cellular telephone calls and FaceTime video conferences.
- In-Person Conversation Transcription: Can use your iPhone microphone to transcribe live spoken dialogue during real-world face-to-face meetings.
- Strictly On-Device Processing: Speech recognition runs locally in system memory via the Apple Neural Engine; your voice and listening audio are never recorded, saved, or uploaded to the cloud.
How to Enable Live Captions on iPhone
Turning on real-time subtitles takes less than a minute in Accessibility settings:
- Open the Settings app on your iPhone.
- Scroll down and tap Accessibility.
- Under the Hearing section, tap Live Captions.
- Toggle the switch next to Live Captions to the green On position.
- A floating dark caption ribbon or rectangular window will immediately appear on your screen, ready to display spoken words.
Customising Caption Text Appearance and Opacity
You can personalise subtitle typography to match your reading preferences:
- In Settings > Accessibility > Live Captions, tap Appearance.
- Adjust the Text Size slider to enlarge or shrink subtitle characters.
- Tap Text Colour and Background Colour to create high-contrast combinations (such as bright yellow text on a deep black background).
- Adjust Idle Opacity so the floating caption card fades to a subtle transparency when no audio is playing.
Using Live Captions in Daily Media and Calls
Interacting with the floating subtitle box is simple and non-intrusive:
- Play any video, podcast, or voice memo; transcribed text will stream fluidly across the caption box in real time.
- Tap the floating caption card to expand it into full-screen view or pause transcription.
- Drag the card to any edge of the display to position it away from interactive app buttons.
- To quickly dismiss or summon Live Captions without opening Settings, add it to your Accessibility Shortcut (triple-click Side button) in Settings > Accessibility > Accessibility Shortcut.