Compare Excel files.
Spot the differences.
Drop two Excel or CSV files to compare
cell values, added or deleted rows, formulas and formatting.
Free to use, with no usage limits and no file uploads.
Your files stay in your browser.
Let’s spot the differences!
Just drop two files!
Spot hidden differences!
The first row is compared, too. Without a primary key, cells are compared by position. For reordered, inserted or deleted rows, select a unique ID column as the primary key. Column names come from the first row.
What is compared and current limits
Compare stored XLSX values, data types, formulas, standard cell formatting (fill, font, borders, alignment and number formats), merged cells, and row or column dimensions. Evaluated conditional formatting, images, shapes, comments, link destinations, print settings, table styles and macros are not compared.
Formulas are not recalculated. CSV is read as text to preserve leading zeros. XLS uses a compatibility reader and supports number-format comparison only. Safety limits: 50 MB and 500,000 cells per file, and 2 million cell pairs per sheet. Data beyond these limits is not silently omitted.
side by side
formulas and formatting
added or removed
exclude columns or use keys
of the differences
to save and share
Excel Diff processes your files locally in your browser.
No file uploads. No spreadsheet data is sent to a server.
Free to use forever!
Your work buddy!
Difference report
How to compare Excel files
Frequently asked questions
Are my files uploaded to a server?
No. Reading, comparison and report generation all take place locally in your browser.
Can I compare an XLSX file with a CSV file?
Yes. A CSV file is treated as a workbook with one sheet. Comparisons involving CSV use text values; formatting and data types are not compared.
What is a primary key used for?
Choose a column such as a unique ID to match rows by their keys instead of their row numbers. This helps distinguish added, deleted and changed rows when their order changes.
Privacy
Excel Diff is a static web application. Selected files are never uploaded to an external server. XLSX and CSV are processed without downloading an external library. Only legacy XLS files require a compatibility library from a CDN; the spreadsheet itself is not transmitted.