FastColoredTextBox

Fast Colored TextBox is text editor component for .NET. Allows you to create custom text editor with syntax highlighting. It works well with small, medium, large and very-very large files.

It has such settings as foreground color, font style, background color which can be adjusted for arbitrarily selected text symbols. One can easily gain access to a text with the use of regular expressions. WordWrap, Find/Replace, Code folding and multilevel Undo/Redo are supported as well.

Update Logs

04-09-2025 (V2.17.0.205)

• Undo/Redo core logic refactored (position accuracy, cross-line support)
• Column selection mode IndexOutOfRangeException fixed
• Horizontal scroll text overlapping line numbers fixed
• Default padding 2px (matches WinForms TextBox)
• Localization support for Find/Replace/GoTo/Hotkeys forms (EN/ZH)
• Chinese labels shortened to match English width
• Label z-order fixed (no longer overlaps controls)
• Redo shortcut changed to Ctrl+Y (standard Windows convention)
• .NET 10.0 support added

25-12-22 (V2.17.0.203)

• A wordwrapping bug fixed
• .NET6.0 target removed for better code optimization (now targeting .NET7-9)
• Some other code optimization

25-04-02 (V2.17.0.2)

• CJKL mix wordwrapping almost perfect/中日韩拉丁字母混合换行基本完美
• Targeting .NET6.0-9.0
• Restructed the code and minor optimization

24-12-30 (V2.17.0.0)

• Reforked from Wiredwizard:-Daxanius:-PavelTorgashov 24-12-25 (V2.16.27.106)
• Improved CJK support with demo added,now it suits general CJK application comfortably.
• CN:添加了CJK支持，做了demo，现在支持一般CJK应用没问题。 24-12-24 (V2.16.27.103)
• Add UseCJK property, may need further improvements.

24-12-20 (V2.16.27.100)

• Start to support correct displaying Chinese based on the lately found fork by Daxanius, though not perfect, still needs some tweeks in later version
• CN:在能找到的最新的Daxanius版本上增加了汉字显示支持，虽不完美还需在以后版本调整
• Multitargeting net6.0-8.0
• Upgrade to C#12 sematics

Known Issues

• Wordwrapped lines may exceed controlwidth in some cases, especially when scollbar is visible, but can be solved by setting PaddingRight property.

More details http://www.codeproject.com/Articles/161871/Fast-Colored-TextBox-for-syntax-highlighting

Nuget package https://www.nuget.org/packages/VAX-FCTB/