Checking Grammar in Excel Files with Python

What will you learn?

In this comprehensive guide, you will discover how to automate the process of checking grammar within Excel files using Python. By leveraging Python libraries such as openpyxl for handling Excel files and language_tool_python for grammar checking, you will be equipped to efficiently ensure the correctness of textual data in your spreadsheets.

Introduction to Problem and Solution

Working with extensive datasets in Excel often involves verifying the grammatical accuracy of text entries, which can be a time-consuming and error-prone task when done manually. However, by combining the capabilities of Python libraries such as openpyxl and language_tool_python, we can automate this process effectively.

The solution entails reading an Excel file’s contents using openpyxl, then applying grammar checks through language_tool_python to identify and highlight any potential grammatical errors. This automated approach not only saves time but also enhances accuracy by utilizing advanced natural language processing algorithms for detecting grammar issues.


import openpyxl
from language_tool_python import LanguageTool

def check_grammar_in_excel(file_path):
    # Load workbook and select active sheet
    wb = openpyxl.load_workbook(file_path)
    ws =

    # Initialize LanguageTool object
    tool = LanguageTool('en-US')

    # Iterate through each row and column cell with text in active sheet.
    for row in ws.iter_rows():
        for cell in row:
            if isinstance(cell.value, str):
                matches = tool.check(cell.value)
                if matches:
                    print(f"Grammar issue found at Cell {cell.coordinate}:")
                    for match in matches:
                        print(f"- {match.ruleId}: {match.message}")

# Example usage: Replace 'your_file.xlsx' with your actual file path.

# Copyright PHD


Below are the detailed steps involved in automating grammar checks within Excel files using Python:

  1. Load Workbook & Select Sheet: The script loads an Excel workbook from a specified file path and selects the active sheet for processing.
  2. Initialize LanguageTool: A LanguageTool object is created with ‘en-US’ specifying American English as the target dialect.
  3. Iterate Through Cells: It iterates over each cell containing textual data on the selected worksheet, checking for grammatical errors using language_tool_python.
  4. Printing Errors: Any identified grammar issues are displayed along with their specific details like rule ID and error message.

By following these steps, users can efficiently identify and address potential grammatical errors within their Excel files without manual intervention.

  1. How do I install the required libraries?

  2. To install the necessary libraries, run:

  3. pip install openpyxl language_tool_python
  4. # Copyright PHD
  5. Can I check spelling alongside grammar?

  6. Yes, language_tool_python performs both spelling and grammar checks by default.

  7. How do I specify another language besides English?

  8. You can change the language setting when initializing LanguageTool by providing a different code like ‘de-DE’ for German or ‘es-ES’ for Spanish.

  9. What versions of Excel does this work with?

  10. This method is compatible with .xlsx files (Excel 2010 onwards).

  11. Can I write corrections back into my spreadsheet?

  12. While not covered explicitly here, you can programmatically modify cell values based on suggestions before saving your workbook again using OpenPyXL�s .save() method.


Automating grammar checks within Excel spreadsheets using Python empowers users to enhance data quality efficiently. By integrating tools like OpenPyXL and Language Tool Python, users can streamline validation processes effectively against common linguistic pitfalls during data analysis tasks.

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