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Libxlsxwriter: A C library for creating Excel XLSX files.

demo image

The libxlsxwriter library

Libxlsxwriter is a C library that can be used to write text, numbers, formulas and hyperlinks to multiple worksheets in an Excel 2007+ XLSX file.

It supports features such as:

  • 100% compatible Excel XLSX files.
  • Full Excel formatting.
  • Merged cells.
  • Defined names.
  • Autofilters.
  • Charts.
  • Data validation and drop down lists.
  • Conditional formatting.
  • Worksheet PNG/JPEG images.
  • Cell comments.
  • Support for adding Macros.
  • Memory optimization mode for writing large files.
  • Source code available on GitHub.
  • FreeBSD license.
  • ANSI C.
  • Works with GCC, Clang, Xcode, MSVC 2015, ICC, TCC, MinGW, MingGW-w64/32.
  • Works on Linux, FreeBSD, OpenBSD, OS X, iOS and Windows. Also works on MSYS/MSYS2 and Cygwin.
  • Compiles for 32 and 64 bit.
  • Compiles and works on big and little endian systems.
  • The only dependency is on zlib.

Here is an example that was used to create the spreadsheet shown above:

#include "xlsxwriter.h"

int main() {

    /* Create a new workbook and add a worksheet. */
    lxw_workbook  *workbook  = workbook_new("demo.xlsx");
    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);

    /* Add a format. */
    lxw_format *format = workbook_add_format(workbook);

    /* Set the bold property for the format */

    /* Change the column width for clarity. */
    worksheet_set_column(worksheet, 0, 0, 20, NULL);

    /* Write some simple text. */
    worksheet_write_string(worksheet, 0, 0, "Hello", NULL);

    /* Text with formatting. */
    worksheet_write_string(worksheet, 1, 0, "World", format);

    /* Write some numbers. */
    worksheet_write_number(worksheet, 2, 0, 123,     NULL);
    worksheet_write_number(worksheet, 3, 0, 123.456, NULL);

    /* Insert an image. */
    worksheet_insert_image(worksheet, 1, 2, "logo.png");


    return 0;

See the full documentation for the getting started guide, a tutorial, the main API documentation and examples.

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