Crimson Editor is a professional source editor for Windows.

This program is not only fast in loading time, but also small in size (so small that it can be copied in one floppy disk).

While it can serve as a good replacement for Notepad, it also offers many powerful features for programming languages such as HTML, C/C++, Perl and Java.

Syntax Highlighting for HTML, C/C++, Perl, Java, Matlab and LaTeX. Also, it can be extended for other programming languages based on custom syntax files.

Edit multiple documents
- switch between documents using file selection tab
- pressing Ctrl+Tab brings the last accessed document to top

Syntax highlighting
- configurable via custom syntax files
- preconfigured for HTML, CSS, C/C++, Perl, Java, Delphi, Python, Matlab, LaTeX,
Euphoria, PL/SQL, ASP, JSP, PHP, EDIF, VHDL, and Verilog-HDL

Multi-level undo / redo
- all editing actions are recorded from the opening of a file
- unlimited undo and redo buffers

Natural word wrapping
- word wrapping does not affect syntax highlighting
- configurable wrapping indentation (easer to understand the syntax)

Spell checker
- around 40000 words were added in the dictionary
- users can register new words in their own dictionary (InstallDir/user.dic)

User tools and macros
- execute external programs with proper arguments
- compile, execute and test your code
- ease your fingers with key stroke recording (record & replay)

Directory tree view window
- click to open documents
- filter to display only selected file class

Edit remote files directly using built-in FTP client
- open, edit, and save documents in remote FTP servers
- save account information (encoded) for automatic logon

Find & Replace
- replace specified text one by one, or as a whole

Print & Print preview
- configurable page header and footer
- print with line numbers
- print with syntax highlighting (used in color printer)
- true type font selection for printer

Other useful features
single instance / multiple instances, ability to detect changed files,
bookmark & go to, highlight active line, highlight matching pairs,
multi-byte support with integrated IME (for eastern languages),
auto indent, wheel mouse support, copy & paste, line numbers,
configurable line spacing, option to save files in Unix format,
option to set working directory
Other features include undo/redo, user tools, macros, spell checker and more.