ReceiptSharp

.NET printing library for receipt printers, simple and easy with receipt markdown, printer status support.

using ReceiptSharp;

string example = @"^^^RECEIPT

11/30/2025, 12:34:56 PM
Asparagus | 1| 1.00
Broccoli  | 2| 2.00
Carrot    | 3| 3.00
---
^TOTAL | ^6.00";

ReceiptSession session = new ReceiptSession("192.168.192.168");
session.Ready += async (sender, e) => Console.WriteLine(await session.Print(example));
session.Open();
Console.ReadLine();
session.Close();

Console.WriteLine(new Receipt(example).ToSvg());

Features

ReceiptSharp is simple printing library for receipt printers that prints with easy markdown data for receipts and returns printer status. Even without a printer, it can output images.

ReceiptSharp auto-detects printer models for seamless printing.

A development tool is provided to edit, preview, and print the receipt markdown.
https://receiptline.github.io/receiptjs-designer/

Receipt printers

• Epson TM series
• Seiko Instruments RP series
• Star MC series
• Citizen CT series
• Fujitsu FP series

Connect with IP address or serial port.
(LAN, Bluetooth, virtual serial port, and real serial port)

Epson TM series (South Asia model) and Star MC series (StarPRNT model) can print with device font of Thai characters.

ReceiptSession Class

Namespace: ReceiptSharp

Print receipt markdown text and notify printer status.

Examples

using ReceiptSharp;

string example = @"^^^RECEIPT

11/30/2025, 12:34:56 PM
Asparagus | 1| 1.00
Broccoli  | 2| 2.00
Carrot    | 3| 3.00
---
^TOTAL | ^6.00";

ReceiptSession session = new ReceiptSession("COM1");
session.StatusChanged += (sender, e) =>
{
    Console.WriteLine(e);
};
session.Ready += async (sender, e) =>
{
    string result = await session.Print(example, "-c 42 -u");
    Console.WriteLine(result);
};
session.Open();
Console.ReadLine();
session.Close();

Constructors

Name	Description
ReceiptSession(String)	Create instance.

Properties

Name	Description
Status	Printer status.
Drawer	Cash drawer status.

Methods

Name	Description
Open()	Open session.
Print(String, String)	Print receipt markdown.
InvertDrawerState(Boolean)	Invert cash drawer state.
Close()	Close session.

Events

Name	Description
StatusChanged	Printer status updated.
Ready	Ready to print.
Online	Printer is online.
CoverOpen	Printer cover is open.
PaperEmpty	No receipt paper.
Error	Printer error (except cover open and paper empty).
Offline	Printer is off or offline.
Disconnect	Printer is not connected.
DrawerChanged	Drawer status updated.
DrawerClosed	Drawer is closed.
DrawerOpen	Drawer is open.

ReceiptSession Constructor

public ReceiptSession(string destination)

The ReceiptSession() constructor creates a new ReceiptSession instance.

Parameters

• destination
  • IP address or serial port of target printer

Serial port options:

"COM1:115200N81"

• <port name>[:<options>]
• <options>
  • <baud rate>,<parity>,<data bits>,<stop bits>[,<flow control>]
  • Default: 9600,N,8,1,N
  • Commas can be omitted
• <baud rate>
  • 2400, 4800, 9600, 19200, 38400, 57600, 115200
• <parity>
  • N: None, E: Even, O: Odd
• <data bits>
  • 8, 7
• <stop bits>
  • 1, 2
• <flow control>
  • N: None, R: RTS/CTS, X: XON/XOFF

Returns

• A new ReceiptSession instance.

ReceiptSession.Status Property

public string Status { get; }

The Status property is a string representing the printer status.

Property Value

• A string representing the printer status.
  • Online: Printer is online
  • Print: Printer is printing
  • CoverOpen: Printer cover is open
  • PaperEmpty: No receipt paper
  • Error: Printer error (except cover open and paper empty)
  • Offline: Printer is off or offline
  • Disconnect: Printer is not connected

ReceiptSession.Drawer Property

public string Drawer { get; }

The Drawer property is a string representing the cash drawer status.

Property Value

• A string representing the cash drawer status.
  • DrawerClosed: Drawer is closed
  • DrawerOpen: Drawer is open
  • Offline: Printer is off or offline
  • Disconnect: Printer is not connected

ReceiptSession.Open Method

public void Open()

The Open() method starts a session and connects to the target printer.

ReceiptSession.Print Method

public async Task<string> Print(string markdown, string options = "")

The Print() method prints a receipt markdown text.

Parameters

• markdown
  • Receipt markdown text
• options
  • -c <chars>: Characters per line
    • Range: 24-96
    • Default: 48
  • -l <language>: Language of receipt markdown text
    • en, fr, de, es, po, it, ru, ...: Multilingual (cp437, 852, 858, 866, 1252 characters)
    • ja: Japanese (shiftjis characters)
    • ko: Korean (ksc5601 characters)
    • zh-hans: Simplified Chinese (gb18030 characters)
    • zh-hant: Traditional Chinese (big5 characters)
    • th: Thai
    • Default: System locale
  • -s: Paper saving (reduce line spacing)
  • -m [<left>][,<right>]: Print margin
    • Range (left): 0-24
    • Range (right): 0-24
    • Default: 0,0
  • -u: Upside down
  • -i: Print as image Not implemented
  • -n: No paper cut
  • -b <threshold>: Image thresholding
    • Range: 0-255
    • Default: Error diffusion
  • -g <gamma>: Image gamma correction
    • Range: 0.1-10.0
    • Default: 1.0
  • -p <printer>: Printer control language
    • escpos: ESC/POS (Epson)
    • epson: ESC/POS (Epson)
    • sii: ESC/POS (Seiko Instruments)
    • citizen: ESC/POS (Citizen)
    • fit: ESC/POS (Fujitsu)
    • impact: ESC/POS (TM-U220)
    • impactb: ESC/POS (TM-U220 Font B)
    • generic: ESC/POS (Generic) Experimental
    • star: StarPRNT
    • starline: Star Line Mode
    • emustarline: Command Emulator Star Line Mode
    • stargraphic: Star Graphic Mode
    • starimpact: Star Mode on dot impact printers Experimental
    • starimpact2: Star Mode on dot impact printers (Font 5x9 2P-1) Experimental
    • starimpact3: Star Mode on dot impact printers (Font 5x9 3P-1) Experimental
    • Default: Auto detection (epson, sii, citizen, fit, impactb, generic, star)
  • -v: Landscape orientation
    • Device font support: escpos, epson, sii, citizen, star
  • -r <dpi>: Print resolution for ESC/POS, landscape, and device font
    • Values: 180, 203
    • Default: 203

Returns

• A Task that fulfills with a string once the print result is ready to be used.
  • Success: Printing success
  • Print: Printer is printing
  • CoverOpen: Printer cover is open
  • PaperEmpty: No receipt paper
  • Error: Printer error (except cover open and paper empty)
  • Offline: Printer is off or offline
  • Disconnect: Printer is not connected

ReceiptSession.InvertDrawerState Method

public void InvertDrawerState(bool invert)

The InvertDrawerState() method inverts cash drawer state.

Parameters

• invert
  • If true, invert drawer state

ReceiptSession.Close Method

public void Close()

The Close() method closes the connection and ends the session.

Receipt Class

Namespace: ReceiptSharp

Convert to image, plain text, or printer commands.

Examples

using ReceiptSharp;

string example = @"^^^RECEIPT

11/30/2025, 12:34:56 PM
Asparagus | 1| 1.00
Broccoli  | 2| 2.00
Carrot    | 3| 3.00
---
^TOTAL | ^6.00";

Receipt receipt = new Receipt(example, "-c 42 -l en");
string svg = receipt.ToSvg();
Console.WriteLine(svg);
string txt = receipt.ToText();
Console.WriteLine(txt);

Constructors

Name	Description
Receipt(String, String)	Create instance.

Methods

Name	Description
ToSvg()	Convert receipt markdown to SVG.
ToPng()	Convert receipt markdown to PNG. Not implemented
ToText()	Convert receipt markdown to text.
ToCommand()	Convert receipt markdown to printer commands.
ToString()	Return string representing this object.

Receipt Constructor

public Receipt(string markdown, string options = "")

The Receipt() constructor creates a new Receipt instance.

Parameters

• markdown
  • Receipt markdown text
• options
  • -p <printer>: Printer control language
    • escpos: ESC/POS (Epson)
    • epson: ESC/POS (Epson)
    • sii: ESC/POS (Seiko Instruments)
    • citizen: ESC/POS (Citizen)
    • fit: ESC/POS (Fujitsu)
    • impact: ESC/POS (TM-U220)
    • impactb: ESC/POS (TM-U220 Font B)
    • generic: ESC/POS (Generic) Experimental
    • star: StarPRNT
    • starline: Star Line Mode
    • emustarline: Command Emulator Star Line Mode
    • stargraphic: Star Graphic Mode
    • starimpact: Star Mode on dot impact printers Experimental
    • starimpact2: Star Mode on dot impact printers (Font 5x9 2P-1) Experimental
    • starimpact3: Star Mode on dot impact printers (Font 5x9 3P-1) Experimental
  • -c <chars>: characters per line
    • Range: 24-96
    • Default: 48
  • -l <language>: Language of receipt markdown text
    • en, fr, de, es, po, it, ru, ...: Multilingual (cp437, 852, 858, 866, 1252 characters)
    • ja: Japanese (shiftjis characters)
    • ko: Korean (ksc5601 characters)
    • zh-hans: Simplified Chinese (gb18030 characters)
    • zh-hant: Traditional Chinese (big5 characters)
    • th: Thai
    • Default: System locale
  • -s: Paper saving (reduce line spacing)
  • -m [<left>][,<right>]: Print margin
    • Range (left): 0-24
    • Range (right): 0-24
    • Default: 0,0
  • -u: Upside down
  • -i: Print as image Not implemented
  • -n: No paper cut
  • -b <threshold>: Image thresholding
    • Range: 0-255
    • Default: Error diffusion
  • -g <gamma>: Image gamma correction
    • Range: 0.1-10.0
    • Default: 1.0
  • -v: Landscape orientation
    • Device font support: escpos, epson, sii, citizen, star
  • -r <dpi>: Print resolution for ESC/POS, landscape, and device font
    • Values: 180, 203
    • Default: 203

Returns

• A new Receipt instance.

Receipt.ToSvg Method

public string ToSvg()

The ToSvg() method converts to SVG.

Returns

• A string representing the SVG.

Receipt.ToPng Method

public string ToPng()

The ToPng() method converts to PNG.

Returns

• A string representing the PNG in data URL format.

Receipt.ToText Method

public string ToText()

The ToText() method converts to plain text.

Returns

• A string representing the plain text.

Receipt.ToCommand Method

public byte[] ToCommand()

The ToCommand() method converts to printer commands.

Returns

• A byte array representing the printer commands.

Receipt.ToString Method

public override string ToString()

The ToString() method returns a string representing the receipt markdown text.

Returns

• A string representing the receipt markdown text.

Receipt Markdown

This language conforms to the OFSC ReceiptLine Specification.
https://www.ofsc.or.jp/receiptline/en/

ReceiptLine is the receipt description language that expresses the output image of small roll paper.
It supports printing paper receipts using a receipt printer and displaying electronic receipts on a POS system or smartphone.
It can be described simply with receipt markdown text data that does not depend on the paper width.

Syntax

Railroad diagram

document

line

columns

column

text

char

escape

ws (whitespace)

property

member

key

value

Grammar

Structure

The receipt is made of a table, which separates each column with a pipe |.

Line	Content	Description
column | column | | column column |	Text Property	Single column
column | column | column | column | | column | column column | column |	Text	Double column
column | ... | column | column | ... | column | | column | ... | column column | ... | column |	Text	Multiple columns

Alignment

The column is attracted to the pipe | like a magnet.
␣ means one or more whitespaces.

Column	Description
column |column| |␣column␣|	Center
|column |column␣| column␣|	Left
column| |␣column| |␣column	Right

Text

The text is valid for any column.

Asparagus | 0.99
Broccoli | 1.99
Carrot | 2.99
---
^TOTAL | ^5.97

Characters are printed in a monospace font (12 x 24 px).
Wide characters are twice as wide as Latin characters (24 x 24 px).
Control characters are ignored.

Special characters in text

Special characters are assigned to characters that are rarely used in the receipt.

Special character	Description
\	Character escape
|	Column delimiter
{	Property delimiter (Start)
}	Property delimiter (End)
- (1 or more, exclusive)	Horizontal rule
= (1 or more, exclusive)	Paper cut
~	Space
_	Underline
"	Emphasis
`	Invert
^	Double width
^^	Double height
^^^	2x size
^^^^	3x size
^^^^^	4x size
^^^^^^	5x size
^^^^^^^ (7 or more)	6x size

Escape sequences in text

Escape special characters.

Escape sequence	Description
\\	\
\|	|
\{	{
\}	}
\-	- (Cancel horizontal rule)
\=	= (Cancel paper cut)
\~	~
\_	_
\"	_
\`	`
\^	^
\n	Wrap text manually
\xnn	Hexadecimal character code
\char (Others)	Ignore

Properties

The property is valid for lines with a single column.
Text, images, barcodes, and 2D codes cannot be placed on the same line.

{ width: * 10; comment: the column width is specified in characters }

Key	Abbr	Value	Default	Description
image	i	base64 png format	-	Insert image Drag a PNG file, hold [Shift] and drop it on a blank line (Recommended: monochrome, critical chunks only)
code	c	textdata	-	Insert barcode / 2D code
command	x	textdata	-	Insert device-specific commands
comment	_	textdata	-	Insert comment
option	o	see below	code128 2 72 nohri 3 l	Set barcode / 2D code options (Options are separated by commas or one or more whitespaces)
border	b	line space none 0 - 2	space	Set column border (chars) (Border width: line=1, space=1, none=0)
width	w	auto * 0 -	auto (* for all columns)	Set column widths (chars) (Widths are separated by commas or one or more whitespaces)
align	a	left center right	center	Set line alignment (Valid when line width < characters per line)
text	t	wrap nowrap	wrap	Set text wrapping

Barcode options

Barcode options are separated by commas or one or more whitespaces.

Barcode option	Description
upc	UPC-A, UPC-E (Check digit can be omitted)
ean jan	EAN-13, EAN-8 (Check digit can be omitted)
code39	CODE39
itf	Interleaved 2 of 5
codabar nw7	Codabar (NW-7)
code93	CODE93
code128	CODE128
2 - 4	Barcode module width (px)
24 - 240	Barcode module height (px)
hri	With human readable interpretation
nohri	Without human readable interpretation

2D code options

2D code options are separated by commas or one or more whitespaces.

2D code option	Description
qrcode	QR Code
3 - 8	Cell size (px)
l m q h	Error correction level

Special characters in property values

Special characters in property values are different from special characters in text.

Special character	Description
\	Character escape
|	Column delimiter
{	Property delimiter (Start)
}	Property delimiter (End)
:	Key-value separator
;	Key-value delimiter

Escape sequences in property values

Escape special characters.

Escape sequence	Description
\\	\
\|	|
\{	{
\}	}
\;	;
\n	New line
\xnn	Hexadecimal character code
\char (Others)	Ignore