100% local and secure
Your data stays on your device and is never sent to our servers.
Compare two Excel or CSV files
Analyze two tables side by side, identify added, removed, or changed rows, and export a detailed comparison report.
- 100% local
- Instant
- Free
- No account
- Works offline
- Batch processing
Your files are processed locally in your browser and are never sent to our servers.
Drop your file here
Recommended size: up to 40 MB
Comparison settings
Processing…0 %
Added
0
Removed
0
Changed
0
Result
Why use this tool?
Compare two Excel or CSV files using a key column to find added, removed or changed rows.
Smart processing
Clean, structure, and transform your data with rules tailored to the format being processed.
Supported formats
CSV, XLSX, and other tabular formats depending on each tool’s capabilities.
Save time
Get a clean, ready-to-use result in seconds without installing software or configuring a complex workflow.
Guide
How to use this tool
- 1
Import the files
Add the reference and comparison versions.
- 2
Select the key
Choose the column that uniquely identifies each row.
- 3
Review the report
Review and export detected differences.
Tips and best practices
- Work on a copy when your data is important.
- Review the result before reusing it in another application.
- Processing takes place directly in your browser.
Frequently asked questions
Why is a key column needed?
It reliably matches each row in the first file with its counterpart in the second.
Is my data uploaded?
No. Processing happens locally in your browser.
Can I use this tool for free?
Yes. The tool is free and requires no account.
Was this tool useful?
Read next
GuideBest practicesIntermediate
Build a reproducible data-preparation workflow
Put cleaning, validation, filtering, merging, comparison and conversion in a sensible order, and learn when a reusable pipeline is better than isolated tools.
29 August 20262 minRead
GuideBest practicesBeginner
Compare two CSV or Excel files and identify the differences
Learn how to compare two versions of a table using a stable key and distinguish added, removed and modified records.
29 August 20262 minRead
GuideBest practicesBeginner
Remove duplicates and validate CSV data without deleting the wrong rows
Understand how to define a reliable duplicate key, distinguish exact and business duplicates, and validate a CSV before and after deduplication.
29 August 20262 minRead
GuideBest practicesBeginner
Data and tables: understanding CSV, Excel, JSON and dataset structure
Learn how tabular data is structured, how CSV, Excel, JSON and TSV differ, and how to choose the right format before cleaning, converting or automating a workflow.
29 August 20263 minRead
Recommended workflow
Continue your processing
Discover tools that naturally fit before, after, or alongside this one.
Complementary tools
Data & spreadsheets
Clean an Excel or CSV file
Remove duplicates, empty rows and unnecessary spaces.
100% localFeatured
Use this toolData & spreadsheets
Merge Excel or CSV files
Merge multiple Excel or CSV files into one table with automatic column alignment.
100% localFeatured
Use this toolData & spreadsheets
Convert Excel, CSV and JSON
Convert Excel, CSV, and other spreadsheet formats directly in your browser.
100% localFeatured
Use this tool