If YouTube’s captions are too small to read comfortably, the fix is in the player’s caption settings, not a separate app or extension.
On Desktop (Web Browser)
- Play any video and click the CC icon to turn on captions if they aren’t already on.
- Click the gear/settings icon in the player.
- Select Subtitles/CC > Options.
- Adjust Font size, and optionally font family, color, and background opacity, to your preference.
These settings apply across YouTube on that browser, so you only need to set them once.
On the YouTube Mobile App (iOS and Android)
- Tap the CC icon on any video to enable captions.
- Go to your profile icon > Settings > Captions.
- Adjust the caption size and style from there — this applies to all videos you watch in the app going forward.
On Smart TVs and Streaming Devices
Caption size on TV apps is usually controlled by your TV or streaming device’s own system-wide accessibility settings (for example, Settings > Accessibility > Captions on most smart TVs and streaming boxes) rather than inside the YouTube app itself.
FAQ
Do caption size settings apply to every video?
Yes, once set in your browser or app, they apply across all YouTube videos you watch on that device.
Can I change subtitle size on a smart TV?
Usually through the TV or streaming device’s own accessibility settings, not inside the YouTube app itself.