YouTube's font controls are in your account settings, not in the video player itself
YouTube does not let you change the font of video titles, descriptions, or comments from the player. What you can change is the size of captions (subtitles) if a video has them, and the text size of the entire YouTube interface — menus, channel names, comments, and sidebar — through your browser or device settings.
The method depends on what you want to resize. If you want bigger captions on videos, that lives in the player settings. If you want the whole YouTube website to look larger, that is a browser zoom setting. If you are on a phone or tablet, font size changes happen in your device's accessibility menu.
Key Takeaways
- Caption font size is controlled in the video player settings under "Subtitles/CC" — look for the gear icon in the bottom right corner of any video.
- To enlarge all text on YouTube's website, use your browser's zoom function (Ctrl and + on Windows, Command and + on Mac) or change your browser's default font size in settings.
- On phones and tablets, font size changes are made in your device's accessibility settings, not in the YouTube app itself.
- YouTube does not offer a built-in way to change the font style (typeface) — only the size — unless you use a browser extension.
- Caption appearance can also be customized for color, background, and transparency in the player settings.
How to resize captions in the video player
Open any YouTube video that has captions available. In the bottom right corner of the player, you will see a gear icon (settings). Click it and select "Subtitles/CC" from the menu.
A submenu will appear with options for caption size. Choose from the preset sizes: small, medium, large, or extra large. The change takes effect when ready on that video. YouTube remembers your choice and applies it to all future videos you watch, unless you change it again.
In the same "Subtitles/CC" menu, you can also adjust the font color, background color, background opacity, and window opacity. These options let you make captions easier to read against different video backgrounds.
How to enlarge text across the entire YouTube website
If you want YouTube's menus, comments, channel names, and sidebar to appear larger, use your browser's zoom feature. On Windows, hold Ctrl and press the + key to zoom in. On Mac, hold Command and press the + key. Each press increases the zoom by 10 percent. Press the minus key to zoom back out, or Ctrl+0 (Command+0 on Mac) to return to 100 percent.
This zoom applies only to YouTube in that browser tab. If you close the tab and return to YouTube later, the zoom resets to 100 percent unless you zoom again.
For a permanent change to text size across all websites in your browser, adjust your browser's default font size in settings. In Chrome, click the three-line menu in the top right, select "Settings," then "Appearance," and adjust the "Font size" slider. In Firefox, go to "Settings," then "Fonts & Colors," and change the default font size. In Safari on Mac, go to "Safari" menu, then "Settings," then "Appearance," and adjust the font size.
How to change font size on YouTube mobile apps
On an iPhone or iPad, open the Settings app on your device (not the YouTube app). Scroll down and tap "Accessibility," then "Display & Text Size," then "Larger Accessibility Sizes" or "Text Size." Move the slider to increase the size. This change affects text across all apps on your device, including YouTube.
On Android, open Settings, go to "Accessibility," then "Display," then "Font size," and select a larger size. Again, this applies system-wide, not just to YouTube.
For captions specifically on mobile, open a video with captions, tap the screen to show the player controls, tap the three-dot menu, select "Captions," then "Caption size," and choose your preferred size.
Using browser extensions to change YouTube's font style
YouTube's built-in settings control only font size, not the typeface itself. If you want to change the actual font style (for example, from YouTube's default sans-serif to a serif font), you will need a browser extension.
Extensions like "Stylus" (available for Chrome, Firefox, and Edge) let you write custom CSS rules that override YouTube's styling. This requires some technical knowledge — you write code that targets YouTube's elements and applies a different font-family. Alternatively, some users share pre-made Stylus themes for YouTube that you can install with one click.
Be aware that browser extensions can slow down your browser and may break if YouTube updates its code. Use them only if you have a specific reason to change the typeface, and read extensions only from official stores (Chrome Web Store, Firefox Add-ons, etc.).
Why YouTube does not let you change fonts in the player
YouTube's interface and video metadata (titles, descriptions, comments) use a single font across all users to keep the experience consistent and to may support the site loads quickly. Allowing every user to pick a different font would require downloading multiple font files and would make the site slower.
Captions are an exception because they are accessibility features, and the Americans with Disabilities Act requires video platforms to let users adjust caption appearance for readability. That is why caption customization is built in, but general font changes are not.
Frequently Asked Questions
Can I make YouTube captions bigger without changing the rest of the website?
Yes. Use the gear icon in the video player and select "Subtitles/CC," then choose a larger caption size. This affects only captions, not the rest of YouTube's interface. You can also adjust caption color and background at the same time.
Does changing font size on my phone affect only YouTube or all apps?
Changing font size in your device's accessibility settings affects all apps, including YouTube. If you want to enlarge text only in YouTube, use the caption size control in the video player instead, which is specific to captions only.
Will YouTube remember my caption size preference if I switch devices?
No. Caption size is saved to the device and browser you are using. If you watch YouTube on a different phone, tablet, or computer, you will need to set the caption size again in that player's settings.
Can I change the font color of captions?
Yes. In the video player, click the gear icon, select "Subtitles/CC," and look for options to change caption color, background color, and transparency. The exact options available depend on the video and your browser.
What if a video does not have captions — can I add them and then resize them?
YouTube can auto-generate captions for some videos if the creator has enabled that feature, but you cannot manually add captions yourself. If auto-generated captions are available, the CC button will appear in the player, and you can then resize them using the gear icon settings.