Setting styles in Openpyxl


I need advice on setting styles in Openpyxl.

I see that the NumberFormat of a cell can be set, but I also require setting of font colors and attributes (bold etc). There is a class but it seems I can’t set the style attribute of a cell, and I don’t really want to start tinkering with the openpyxl source code.

Has anyone found a solution to this?

Asked By: Nelson Shaw



As of openpyxl version 1.5.7, I have successfully applied the following worksheet style options…

from openpyxl.reader.excel import load_workbook
from openpyxl.workbook import Workbook
from openpyxl.styles import Color, Fill
from openpyxl.cell import Cell

# Load the workbook...
book = load_workbook('foo.xlsx')

# define ws here, in this case I pick the first worksheet in the workbook...
#    NOTE: openpyxl has other ways to select a specific worksheet (i.e. by name
#    via book.get_sheet_by_name('someWorksheetName'))
ws = book.worksheets[0]

## ws is a openpypxl worksheet object
_cell = ws.cell('C1')

# Font properties = Color.GREEN = 'Arial' = 8 = True = True

# Cell background color = Fill.FILL_SOLID = Color.DARKRED

# You should only modify column dimensions after you have written a cell in 
#     the column. Perfect world: write column dimensions once per column
ws.column_dimensions["C"].width = 60.0

FYI, you can find the names of the colors in openpyxl/… I sometimes I patch in extra colors from the X11 color names

class Color(HashableObject):
    """Named colors for use in styles."""
    BLACK = 'FF000000'
    RED = 'FFFF0000'
    DARKRED = 'FF800000'
    BLUE = 'FF0000FF'
    DARKBLUE = 'FF000080'
    GREEN = 'FF00FF00'
    DARKGREEN = 'FF008000'
    DARKYELLOW = 'FF808000'
Answered By: Mike Pennington

As of openpyxl-1.7.0 you can do this too: = "FF124191"

I’ve got a couple of helper functions which set a style on a given cell – things like headers, footers etc.

Answered By: Enda Farrell

As of openpyxl 2.0, styles are immutable.

If you have a cell, you can (e.g.) set bold text by: =

Yes, this is annoying.

Answered By: user3757614

As of openpyxl 2.0, setting cell styles is done by creating new style objects and by assigning them to properties of a cell.

There are several style objects: Font, PatternFill, Border, and Alignment. See the doc.

To change a style property of a cell, first you either have to copy the existing style object from the cell and change the value of the property or you have to create a new style object with the desired settings. Then, assign the new style object to the cell.

Example of setting the font to bold and italic of cell A1:

from openpyxl import Workbook
from openpyxl.styles import Font
# Create workbook
wb = Workbook()
# Select active sheet
ws =
# Select cell A1
cell = ws['A1']
# Make the text of the cell bold and italic
cell.font = cell.font.copy(bold=True, italic=True)
Answered By: Tomasz Nguyen

Like openpyxl doc said:

This is an open source project, maintained by volunteers in their spare time. This may well mean that particular features or functions that you would like are missing.

I checked openpyxl source code, found that:

Till openpyxl 1.8.x, styles are mutable. Their attribute can be assigned directly like this:

from openpyxl.workbook import Workbook
from import Color

wb = Workbook()
ws =
ws['A1'].style.font.color.index = Color.RED

However from of openpyxl 1.9, styles are immutable.

Styles are shared between objects and once they have been assigned they cannot be changed. This stops unwanted side-effects such as changing the style for lots of cells when instead of only one.

To create a new style object, you can assign it directly, or copy one from an existing cell’s style with new attributes, answer to the question as an example(forgive my Chinese English):

from openpyxl.styles import colors
from openpyxl.styles import Font, Color
from openpyxl import Workbook
wb = Workbook()
ws =

a1 = ws['A1']
d4 = ws['D4']

# create a new style with required attributes
ft_red = Font(color=colors.RED) 
a1.font = ft_red

# you can also do it with function copy
ft_red_bold = ft_red.copy(bold=True)

# you can copy from a cell's style with required attributes
ft_red_sigle_underline = a1.font.copy(underline="single")

d4.font = ft_red_bold

# apply style to column E
col_e = ws.column_dimensions['E']
col_e.font = ft_red_sigle_underline

A cell’ style contains these attributes: font, fill, border, alignment, protection and number_format. Check openpyxl.styles.

They are similar and should be created as an object, except number_format, its value is string type.

Some pre-defined number formats are available, number formats can also be defined in string type. Check openpyxl.styles.numbers.

from openpyxl.styles import numbers

# use pre-defined values
ws.cell['T49'].number_format = numbers.FORMAT_GENERAL
ws.cell(row=2, column=4).number_format = numbers.FORMAT_DATE_XLSX15

# use strings
ws.cell['T57'].number_format = 'General'
ws.cell(row=3, column=5).number_format = 'd-mmm-yy'
ws.cell['E5'].number_format = '0.00'
ws.cell['E50'].number_format = '0.00%'
ws.cell['E100'].number_format = '_ * #,##0_ ;_ * -#,##0_ ;_ * "-"??_ ;_ @_ '
Answered By: aishenghuomeidaoli

For openpyxl version 2.4.1 and above use below code to set font color:

from openpyxl.styles import Font
from openpyxl.styles.colors import Color

ws1['A1'].font = Font(color = "FF0000")

hex codes for various colors can be found at:

Answered By: Parth Karia

This seems like a feature that has changed a few times. I am using openpyxl 2.5.0, and I was able to set the strike-through option this way:

new_font = copy(cell.font)
new_font.strike = True
cell.font = new_font

It seems like earlier versions (1.9 to 2.4?) had a copy method on the font that is now deprecated and raises a warning:

cell.font = cell.font.copy(strike=True)

Versions up to 1.8 had mutable fonts, so you could just do this:


That now raises an error.

Answered By: Don Kirkby

New 2021 Updated Way of Changing FONT in OpenPyXl:

sheet.cell.font = Font(size=23, underline='single', color='FFBB00', bold=True, italic=True)

Full Code:

import openpyxl  # Connect the library
from openpyxl import Workbook
from openpyxl.styles import PatternFill  # Connect cell styles
from openpyxl.workbook import Workbook
from openpyxl.styles import Font, Fill  # Connect styles for text
from openpyxl.styles import colors  # Connect colors for text and cells

wb = openpyxl.Workbook()  # Create book
work_sheet = wb.create_sheet(title='Testsheet')  # Created a sheet with a name and made it active

work_sheet['A1'] = 'Test text'
work_sheet_a1 = work_sheet['A5']  # Created a variable that contains cell A1 with the existing text
work_sheet_a1.font = Font(size=23, underline='single', color='FFBB00', bold=True,
                          italic=True)  # We apply the following parameters to the text: size - 23, underline, color = FFBB00 (text color is specified in RGB), bold, oblique. If we do not need a bold font, we use the construction: bold = False. We act similarly if we do not need an oblique font: italic = False.

# Important:
# if necessary, the possibility of using standard colors is included in the styles, but the code in this case will look different:
work_sheet_a1.font = Font(size=23, underline='single', color=colors.RED, bold=True,
                              italic=True)  # what color = colors.RED — color prescribed in styles
work_sheet_a1.fill = PatternFill(fill_type='solid', start_color='ff8327',
                                 end_color='ff8327')  # This code allows you to do design color cells
Answered By: Amar Kumar

You can define a common style then you can apply the same to any cell or range.

Define Style:

Define Style:

Apply on a cell.
enter image description here

Answered By: Arpan Saini

This worked for me (font colour + bold font):

from openpyxl.styles import colors
from openpyxl.styles import Font, Color
from openpyxl import Workbook

wb = Workbook()
ws = wb['SheetName']

ws.cell(row_number,column_number).font = Font(color = "0000FF",bold = True)
Answered By: Grant Shannon
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