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How to Compare Two Excel Files

Comparing two Excel files is a common task when working with data, especially in business, accounting, or analysis roles. You may want to find differences in data entries, formulas, formatting, or even structure across different Excel files. Fortunately, Excel and some third-party tools offer several ways to do this.

Whether you’re comparing Excel workbooks to catch updates, detect changes, or ensure consistency, this guide will walk you through different methods—from simple built-in techniques to more advanced comparisons using specialized software.

Why Compare Excel Files?

Before jumping into the methods, it’s important to understand why you might need to compare Excel files. Here are a few common use cases:

• Tracking changes between two versions of a file

• Verifying calculations or formulas across datasets

• Comparing data exports from different systems

• Checking for inconsistencies before consolidating data

• Auditing financial or transactional data

Now let’s explore different ways to perform file comparison in Excel.

Method 1: Use Microsoft Spreadsheet Compare (Windows Only)

Microsoft provides a dedicated tool called Spreadsheet Compare, which is part of the Office Professional Plus or Microsoft 365 subscription.

Steps to Use Spreadsheet Compare:

1. Press the Start button on Windows and search for Spreadsheet Compare.

2. Launch the application.

3. Click on Compare Files in the top toolbar.

4. Browse and select the first Excel file and then the second Excel file.

5. Click OK to start the comparison.

What It Can Do:

• Compare values, formulas, macros, and formatting

• Highlight changes and differences clearly

• Generate a comparison report for auditing

This is one of the most thorough ways to compare Excel files if you have access to the tool.

Method 2: Use Excel’s View Side by Side Feature

If you want a quick visual comparison between two Excel workbooks, use the View Side by Side feature.

How to Use View Side by Side:

1. Open both Excel files.

2. Go to the View tab on the Ribbon.

3. Click View Side by Side.

4. Use Synchronous Scrolling to scroll both files together.

Pros:

• Simple and built-in to Excel

• Good for manually reviewing changes

Cons:

• No automatic detection of differences

• Time-consuming for large datasets

This method works best for visual inspection when files aren’t too long or complex.

Method 3: Compare Two Excel Sheets with Formulas

You can use formulas to find differences between two datasets.

Example Formula:

Suppose you have two workbooks: File1.xlsx and File2.xlsx. You want to compare their content in Sheet1, specifically cell-by-cell.

1. Open both files.

2. In a new column or workbook, use a formula like:

3. Drag the formula across the relevant data range.

This will show “Match” where the cells are the same and “Different” where they aren’t.

Tips:

• Be sure both files are open in the same Excel session.

• You can use conditional formatting to highlight differences visually.

Method 4: Use Conditional Formatting to Highlight Differences

For a more dynamic approach, especially within a single workbook or two sheets copied into one file, conditional formatting works well.

Steps:

1. Copy both datasets into separate sheets (e.g., Sheet1 and Sheet2).

2. Go to the sheet where you want to compare.

3. Select the range of cells.

4. Go to Home > Conditional Formatting > New Rule.

5. Choose Use a formula to determine which cells to format.

6. Enter a formula like:

7. Set a formatting style (e.g., red fill).

8. Click OK.

Now, all mismatched cells will be highlighted.

Method 5: Use Third-Party Tools for Comparing Excel Files

If you’re working with large or complex files, third-party tools can offer robust comparison features.

Recommended Tools:

• Beyond Compare: File comparison software that supports Excel formats.

• DiffEngineX: Specifically built for comparing Excel spreadsheets.

• XLTools Compare Spreadsheets: An Excel add-in that compares sheets with just a few clicks.

Benefits:

• Highlight differences in values, formulas, and even structure

• Exportable comparison reports

• Time-saving for large datasets

Some of these tools are paid, but they offer free trials.

Method 6: Power Query for Advanced Users

If you’re familiar with Power Query (Get & Transform), you can use it to compare data across two Excel files.

Steps:

1. Go to the Data tab and click Get Data > From File > From Workbook.

2. Load both files into Power Query.

3. Merge the two tables using Join Queries.

4. Choose Full Outer Join to see all mismatches.

5. Filter the resulting data to show only rows where values are different.

This method is very powerful, especially for comparing lists or database-like tables.

Best Practices When Comparing Excel Files

• Always back up your files before starting comparisons.

• Ensure data formats (e.g., dates, currencies) are consistent.

• Remove unnecessary formatting or empty rows/columns.

• Use named ranges to simplify reference in formulas.

• Highlight differences using colors or comments for easy review.

Conclusion

Comparing two Excel files can be simple or complex depending on your goals and data size. For basic checks, Excel’s built-in tools like View Side by Side and formulas may be sufficient. For detailed and automated comparisons, tools like Spreadsheet Compare or third-party solutions provide better accuracy and speed.

Whether you’re validating reports, reviewing collaborative changes, or auditing data, mastering Excel file comparison ensures data integrity and saves time in your workflow.