Features
Notepad is a common text-only (plain text) editor. The resulting files—typically saved with the .txt extension—have no format tags or styles, making the program suitable for editing system files to use in a DOS environment and, occasionally, source code for later compilation or execution, usually through a command prompt. It is also useful for its negligible use of system resources; making for quick load time and processing time, especially on under-powered hardware. Notepad supports both left-to-right and right-to-left based languages. Unlike WordPad, Notepad does not treat newlines in Unix- or classic Mac OS-style text files correctly. Notepad offers only the most basic text manipulation functions, such as finding text. Only newer versions of Windows include an updated version of Notepad with a search and replace function. However, it has much less functionality in comparison to full-scale editors.
In all versions of Windows, Notepad uses a built-in window class named EDIT and the maximum file size that Notepad can open is dependent on operating system limitations on the size of the EDIT window class, with the limit being different for each version of Windows. Due to the operating system limit of the EDIT window class, the Notepad version shipped with Windows 3.0, Windows 3.1 and Windows 3.11 could not open files larger than 54 KB (kilobytes) and Microsoft recommended not to open files larger than 45 KB, with the official workaround advice provided by Microsoft being "Use another text editor", but this limit was extended to 64 KB in Windows 95 (and remained the same in Windows 98 and Windows Me). On the Notepad version shipped with Windows XP the limit was 32 MB (megabytes) with the application displaying the message "The file is too large for Notepad. Use another editor to edit the file" if the user attempted to open a file larger than 32 MB. Newer versions of Notepad can open files at least up to 58 MB (megabytes) in size, and on Windows 8.1 the Notepad application is able to open files at least as large as 512 MB (megabytes) but fails to open 1 GB (gigabyte) files displaying the same message that Windows XP users would see ("The file is too large for Notepad. Use another editor to edit the file"). However, on all 32-bit versions of Windows, there is a 2 GB (gigabytes) limit imposed on the maximum memory of all single-process 32-bit programs and thus on 32-bit machines no single-process text editor such as Notepad can open files larger than 2 gigabytes.
Up to Windows 95, Fixedsys was the only available display font for Notepad. Windows NT 4.0 and 98 introduced the ability to change this font. As of Windows 2000, the default font was changed to Lucida Console. The font setting, however, only affects how the text is shown to the user and how it is printed, not how the file is saved to disk. The default font was changed to Consolas on Windows 8.
Up to Windows Me, there were almost no keyboard shortcuts and no line-counting feature. Starting with Windows 2000, shortcuts for common tasks like new, open and save were added, as well as a status-bar with a line counter (available only when word-wrap is disabled).
In the Windows NT-based versions of Windows, Notepad can edit traditional 8-bit text files as well as Unicode text files (both UTF-8 and UTF-16, and in case of UTF-16, both little-endian and big-endian).
Notepad also has a simple built-in logging function. Each time a file that starts with .LOG is opened, the program inserts a text timestamp on the last line of the file.