CSV to Excel
Convert a CSV file to Excel (.xlsx) in your browser. Download a real spreadsheet — nothing is uploaded.
Compare CSV files
Compare two CSV files by full row and see counts only in A, only in B, or in both — in your browser.
File A
Drop file A or click to choose
Compared locally
File B
Drop file B here or click to choose
Nothing is uploaded
How to use Compare CSV files
Compare two CSV files by full-row matching and see counts for rows only in A, only in B, or in both. This is not a cell-by-cell diff.
Everything runs locally in your browser — your files are never uploaded to a server.
Compare CSV files FAQs
How do I compare two CSV files?
Drop file A and file B to see how many rows appear only in A, only in B, or in both. Comparison uses full-row matching in your browser.
Is comparing CSV files free?
Yes. Every Excel and CSV tool on ReallyUseful.Tools is free to use, with no account or subscription required.
Are my files uploaded?
No. Files are processed in your browser on this device. Nothing is uploaded to our servers.
Does it show cell-level changes?
No. It compares whole rows as sets. Rows that differ in any field count as different, not as a field-by-field diff.
More Excel/CSV
Excel to CSV
Convert Excel .xlsx or .xls to CSV in your browser. Choose a sheet and delimiter, then download.
CSV viewer
Open and browse a CSV in a paginated table in your browser. No upload — view large files locally.
Merge CSV files
Combine multiple CSV files into one in your browser. Rows are stacked and headers aligned by name.
CSV to XML
Convert CSV rows into structured XML in your browser. Each row becomes an element — nothing is uploaded.