Compare two CSV files side by side.
Upload two CSV or Excel files and instantly see added, removed, and changed rows with clear change highlighting — all in your browser.
How it works
Three simple steps
Open first file
Load the original CSV or Excel file into the editor.
Add second file
Use the compare tool to load the second file for side-by-side diffing.
Review differences
See added, removed, and changed rows clearly highlighted.
Key features
Everything you need
Visual diff
Differences between files are highlighted with color-coded rows and cells.
Side-by-side view
Compare both files in a clear layout that makes changes easy to spot.
Edit after comparing
Fix differences in the editor and export the corrected file.
No uploads required
Both files are compared locally in your browser. Nothing is sent to a server.
Your data stays on your device
SheetTool processes everything locally in your browser. Your files are never uploaded to a server. No account required.
FAQ
Frequently asked questions
How do I compare two CSV files?
Open the first file in SheetTool, then use the compare tool to load the second file. Differences are highlighted automatically.
Can I compare CSV and Excel files?
Yes. You can compare any combination of CSV, XLSX, and XLS files.
What differences does the tool detect?
SheetTool highlights added rows, removed rows, and changed cell values between the two files.
Is the CSV diff tool free?
Yes. SheetTool is completely free with no sign-up required.
Ready to get started?
Open SheetTool and start working with your files right away. No sign-up needed.