A fast, lightweight, Scintilla-based text editor for Windows

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Notepad3 is a free, open-source text editor with syntax highlighting for Windows. Built on the Scintilla editing component and Lexilla lexer library, it has a small memory footprint while being powerful enough for professional programming and everyday text editing.

Notepad3 is based on code from Florian Balmer's Notepad2 and XhmikosR's Notepad2-mod. MiniPath is based on Florian Balmer's metapath.

• Code folding with toggle-all support
• Bookmarks for quick navigation within files
• Word auto-completion with configurable fill-up characters
• Mark all occurrences of a selected word with occurrence count display
• Find and Replace with PCRE2 regular expression engine
• Focused View — filter display to show only lines matching the current word/selection (Ctrl+Alt+V), with fold, bookmark, and highlight modes
• TinyExpr++ — inline math expression evaluation with 80+ functions (type expression=? to evaluate in-place, use ${expr} in line numbering).
• Undo/Redo that preserves selection state
• Visual Studio–style copy/paste of the current line (when nothing is selected)
• Virtual space rectangular selection (Alt+Drag)
• Accelerated word navigation with configurable delimiters
• Insert GUIDs directly into your document
• Clipboard monitoring mode (/b command-line switch) — automatically appends every clipboard change as a new entry at the end of the document; stop at any time via Edit → Stop Clipboard Monitoring without closing the editor.

Over 55 languages supported, including:

ANSI Art, Apache Config, Assembly, AutoHotkey, AutoIt3, AviSynth, Awk, Batch, C/C++, C#, CMake, CoffeeScript, CSS, CSV, D, Dart, Diff, F77/Fortran, Go, HTML/XML, Java, JavaScript, JSON, Julia, Kotlin, KiXtart, LaTeX, Lua, Makefiles, Markdown, MATLAB, Nim, NSIS, Pascal, Perl, PHP, PowerShell, Python, R/S-Plus, Registry, Resource Script, Ruby, Rust, Shell Script, SQL, SystemVerilog, Tcl, TOML, VBScript, VHDL, Verilog, Visual Basic, YAML, and more.