Notepad3 is a lightweight, Scintilla-based text editor for Windows that combines a small memory footprint with professional-grade editing capabilities.
The tool addresses the need for a fast, responsive text editor suitable for both everyday writing and code development. It builds on the Scintilla editing component and Lexilla lexer library to provide syntax highlighting across over fifty languages. Key features include code folding with toggle-all support, bookmarks for navigation, word auto-completion, find and replace with PCRE2 regular expressions, and a Focused View mode that filters display to lines matching the current selection. The editor also offers inline math expression evaluation through TinyExpr++, clipboard monitoring that automatically logs clipboard changes, and rectangular selection with virtual space support.
Notepad3 suits developers and writers who want a responsive alternative to heavier editors without sacrificing functionality. It works well for quick edits, scripting, and programming across many languages. The tool is particularly useful for those who value a minimal interface and fast startup time while still needing features like code folding, bookmarks, and regex-powered search and replace. Its small memory footprint makes it suitable for systems where resource efficiency matters.
The project shows consistent maintenance with regular updates addressing bug fixes and feature refinements. Development activity demonstrates responsiveness to user-reported issues and steady incremental improvements to the codebase. The maintainers actively manage the project's direction through documented changelog entries and maintain comprehensive documentation including FAQ and focused guides for specific features.
