[Plugin] Full Text Underline - underline lines for EPUB reading

[drdtr001]

Hello everyone,

I created a KOReader plugin called Full Text Underline.

This plugin adds configurable underline lines below visible text in reflowable EPUB documents without modifying the book or changing the layout.


Features:

• Solid, dashed and dotted underline styles (dotted lines are best visible at thickness level 2 or above)
• Full-width underline mode
• Text-width underline mode
• Adjustable underline position
• Adjustable underline length
• Adjustable line thickness
• Optional heading underlines
• Per-book settings
• Plugin default settings
• Reading Profile support
• English and Simplified Chinese interface


Screenshots:

(See attached images)


Download:

GitHub repository:
https://github.com/DRDTR001/fulltextunderline.koplugin

Release:
https://github.com/DRDTR001/fulltext...ses/tag/v1.0.0


Compatibility:

Tested with:

• Kindle + KOReader
• Kobo + KOReader
• Android KOReader

Tested version:

• KOReader v2026.07.1


The plugin is designed for reflowable EPUB documents using CRengine.

It does not modify EPUB files and does not change the original layout.


Feedback and suggestions are welcome.

[JSWolf]

Why do you want to underline the text?

[drdtr001]

Originally Posted by JSWolf

Why do you want to underline the text?

I think some readers, including myself, may find that underlining the text makes the reading experience a little more immersive and visually pleasing. Of course, this is just my personal preference, and I understand that everyone has different reading habits. The main reason I made this plugin is simply because I wanted this feature in my own reading workflow, and I thought other readers might enjoy it as well. This is my first time sharing a plugin I created on a forum, so please forgive me if there are any mistakes or things that could be improved. Feel free to give it a try, and I would be happy to hear your thoughts or suggestions.