Opera browser required.
Font Size Increase is a lightweight and straightforward browser extension that brings a single, essential feature to your browsing experience: a button to increase the font size on any webpage with one simple click. Whether you are looking to make the text easier to read, reduce eye strain, or enhance accessibility, Font Size Increase makes it effortless to enlarge text instantly without affecting the page layout or performance. Install today and enjoy larger, more readable fonts with minimal effort.
Font Size Increase is perfect for users who prefer an easy, no-fuss solution to improve readability, including those with visual impairments or anyone who spends long hours reading online. With just one button to increase the font size, this extension is designed for simplicity and ease of use.
If you are also looking to decrease font size with a single click, we offer a companion extension, Font Size Decrease, for complete control over your text size preferences.
https://addons.opera.com/extensions/details/font-size-decrease/
Browser extension features:
◆ One-Click Font Size Increase:
Easily enlarge text on any website with a single click.
◆ Dark Mode Support:
Designed to work seamlessly with dark mode, ensuring comfortable use regardless of your browser's theme.
◆ Toolbar Icon Customization:
Choose from 6 custom icons for your toolbar to personalize the look of the extension.
◆ Double-Click Reset:
Enable the option to reset the font size on the current web page by simply double-clicking the button.
◆ Right-Click Menu Integration:
Optionally enable a right-click menu option to increase the font size on the current web page for quick access.
◆ Simple and Lightweight:
No complicated settings—just a single button to increase font size instantly without slowing down your browsing experience.
◆ Companion Extension Available:
If you want to decrease font size, check out our Font Size Decrease extension for a similarly easy-to-use tool.
Project Information:
https://www.stefanvd.net/project/font-size-increase/browser-extension
Required Permissions:
◆ "contextMenus": This is to add the "Increase font size on this page" menu item in the web browser context menu.
◆ "activeTab": Allow the increase the font size function to be accessible on the currently visible tab page.
◆ "storage": Save settings locally and sync with your web browser account.
<<< Option feature >>>
Unlock an option feature to protect your eyes at night and focus on the video player, such as YouTube™, by installing Turn Off the Lights browser extension for YouTube and Beyond.
https://addons.opera.com/extensions/details/turn-off-the-lights/
- This extension can access your data on some websites.
Screenshots
About the extension
- Downloads
- 1,832
- Category
- Accessibility
- Version
- 1.1.3
- Size
- 336.6 KB
- Last update
- 5 Dec 2025
- Licence
- Privacy policy
- Service website
- https://www.stefanvd.net
- Support page
- https://www.stefanvd.net/support/
- Source code page
- https://github.com/stefanvd
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