Fix ESC POS Receipt Printer Cutting Long Strings on Windows 11

Your ESC POS receipt printer prints only part of each line, cutting off text after 40 or 48 characters. This happens because Windows 11 sends the printer data in a fixed-width font or a column limit that your printer firmware does not override. The printer treats each line as a fixed-length field and truncates anything beyond that width.

This article explains why the printer driver or application setting causes the cut-off and how to change the printer command mode, adjust the character per line setting, or modify your software to send raw ESC/POS commands instead of relying on the default Windows driver. You will learn three verified methods to stop the truncation and print full receipt lines.

Why ESC POS Printers Truncate Long Strings on Windows 11

ESC POS printers expect raw byte sequences that specify font size, character width, and line feed behavior. When you print from a Windows application using a generic text-only driver, the driver assumes a default line width of 40 or 48 characters. The driver sends each line as a fixed-length field and the printer cuts off any characters beyond that length.

The root cause is that the Windows printer driver does not pass the ESC/POS commands that override the printer’s default column setting. Most ESC POS printers have a default column width of 40 characters in standard mode. The driver never sends the GS L nL nH command to set the line width to 80 or 112 characters. As a result, the printer firmware truncates the line at its built-in limit.

Another common cause is that the application sends data in a font that the printer interprets as double-width characters. For example, if the printer is in double-width mode, each character occupies two columns, effectively halving the line length. The printer then cuts off the string at the physical print head width.

Steps to Fix Line Truncation on a ESC POS Printer in Windows 11

You can fix the truncation by changing the way Windows sends data to the printer. The three methods below cover the most reliable approaches. Try them in order.

Method 1: Send Raw ESC/POS Commands to Set Line Width

This method uses a direct connection to the printer and sends the GS L command to set the line width to 80 characters before sending the text. You need a tool such as RawPrinter or POSPrinterCMD to send raw bytes.

1. Find the printer port name
   Open Settings > Bluetooth & devices > Printers & scanners. Click your ESC POS printer. Click Printer properties. On the Ports tab, note the port name (for example, USB001 or COM1).
2. Download a raw byte sender
   Download RawPrinter from the Microsoft Store or use a free command-line tool like print /D:”port” filename. For this example we use RawPrinter.
3. Prepare the ESC/POS command sequence
   Create a text file with the following bytes in hexadecimal: 1B 40 (initialize printer), 1D 4C 50 00 (set line width to 80 characters), then your text followed by 0A (line feed). Save the file as fixline.txt.
4. Send the raw data to the printer
   Open a Command Prompt as Administrator. Run copy /b fixline.txt \localhost\printername where printername is the exact name from step 1. The printer now prints the full line without truncation.

Method 2: Switch from Windows Driver to Raw Printing

This method bypasses the Windows printer driver entirely by using a raw TCP/IP port or a USB passthrough. It works for network printers and USB printers that support raw mode.

1. Open Printer Properties
   Go to Settings > Bluetooth & devices > Printers & scanners. Click your ESC POS printer. Click Printer properties.
2. Add a Standard TCP/IP Port
   Select the Ports tab. Click Add Port. Choose Standard TCP/IP Port. Click New Port. Enter the printer IP address and port number 9100. Click Next and Finish.
3. Change the driver to Generic / Text Only
   On the Advanced tab, click New Driver. Select Generic from the manufacturer list and Generic / Text Only from the drivers list. Click Next and Finish.
4. Set the raw data type
   On the Advanced tab, click Print Processor. Choose Raw as the data type. Click OK twice.
5. Test the printer
   Print a test page from Notepad with a long line of text (for example, 80 characters). The printer should now print the full line without cutting off.

Method 3: Adjust the Application to Output 80 Columns

If you use a point-of-sale or label application, the software may be set to 40 columns. Changing it to 80 columns forces the driver to send longer lines.

1. Open the application settings
   In your POS software, go to Settings > Printer > Receipt Layout or Print Format.
2. Change the column width
   Look for a field labeled Characters per line or Column width. Change the value from 40 to 80. If the field uses inches, set it to 3.5 inches for a 3-inch wide receipt at 24 characters per inch.
3. Save and test
   Save the settings and print a test receipt. The printer should now print the full line.

Common Issues After Fixing Line Truncation

Printer prints garbage characters after sending raw commands

If the printer outputs random symbols or Chinese characters, the raw data sent contains incorrect byte order or missing initialization. Re-send the 1B 40 (initialize) command before any text. Also ensure the file is saved as ANSI, not UTF-8 with BOM. Use a hex editor to verify the first two bytes are 1B 40.

Windows 11 resets the port to USB after reboot

Some USB ESC POS printers revert to the default Windows driver after a system restart. To prevent this, disable the Windows driver for that device in Device Manager. Open Device Manager, expand Print queues, right-click your printer, and select Disable device. Then use only the raw TCP/IP port for printing.

Lines still cut off at 48 characters even with 80-column setting

This happens when the printer is in double-width mode. The printer firmware interprets each character as two columns. Send the ESC/POS command 1B 21 00 to reset character width to normal before printing. Include this command in your raw data sequence right after the initialize command.

Item	Raw ESC/POS method	Windows driver method
Line width control	Explicit GS L command sets any width	Limited by driver column default (40 or 48)
Font width handling	Can reset to normal width with 1B 21 00	Driver may force double-width
Setup complexity	Requires raw byte sender tool	Simple driver change
Compatibility with POS apps	Works with any app that sends to raw port	May break app that expects Windows driver

You can now fix ESC POS receipt printer line truncation on Windows 11 by sending raw ESC/POS commands to set the line width, switching to a raw TCP/IP port with the Generic / Text Only driver, or adjusting your application to output 80 columns. Try the raw command method first because it gives you full control over the printer firmware. If you use a POS application that supports ESC/POS directly, look for a setting to send raw data instead of using the Windows print spooler. An advanced tip: create a batch file that sends the initialization and line width commands before each print job, so the printer never falls back to its default 40-column limit.