Compare Excel Files Online
Upload two files to see the differences. Your data stays in your browser.
Features
100% Offline
Your data never leaves your browser. All processing happens locally.
Multiple Formats
Support for Excel (xlsx, xls), CSV, and ODS files.
Lightning Fast
Handle spreadsheets with thousands of rows efficiently.
Open Source
Free and open source. No sign-up required.
How It Works
1
Upload your original file
Drag & drop or click to browse
2
Upload the modified file
Same formats supported
3
Compare instantly
See all changes highlighted
Frequently Asked Questions
Is DiffSheets free to use?
Yes, DiffSheets is completely free to use. There are no hidden fees, subscriptions, or premium features locked behind a paywall.
Is my data safe when using DiffSheets?
Absolutely. DiffSheets processes all files 100% client-side in your browser. Your spreadsheet data never leaves your computer or gets uploaded to any server.
What file formats does DiffSheets support?
DiffSheets supports Excel files (.xlsx, .xls), CSV files, and OpenDocument Spreadsheets (.ods). You can compare files of the same or different formats.
Can I compare large Excel files?
Yes, DiffSheets uses virtual scrolling technology to efficiently handle large spreadsheets with thousands of rows without performance issues.
How does DiffSheets compare spreadsheets?
DiffSheets offers multiple comparison modes: position-based matching (row by row), key column matching (by a unique identifier), and intelligent LCS algorithm for best alignment detection.