Your files remain yours.
Processing happens in this browser tab. The site does not send your CSV to a server.
CSV, WITHOUT THE MESS 01 / WORKBENCH
Good data starts
with a clean table.
Drop in a CSV, make your changes with confidence, and take the cleaned file back. Or compare two versions to see exactly what moved.
NO SIGN-UPNO FILE UPLOADSDOWNLOAD CSV
YOUR WORKSPACE / 02
Choose your task.
01
Add your CSV
No file selected
02
Make it tidy
RESULT / READY TO REVIEW
Cleaned preview
Showing the first 50 data rows. Download includes every row.
01
Choose file A
No file selected
02
Choose file B
No file selected
RESULT / SIDE BY SIDE
What changed?
Rows are matched by the selected key. Shared column names are compared exactly; download includes every difference.
A FEW THINGS TO KNOW / 03
Simple by design.
Careful by default.
Preview before export.
See warnings about uneven rows or duplicated headers before relying on an output file.
Works with real CSVs.
Quoted commas, line breaks inside cells, UTF-8 BOM and tab separated files are supported.
HOW IT WORKS / 04
Answers before you begin.
How do I remove duplicate rows from a CSV?
Choose a CSV file, turn on “Remove duplicates,” then match by the entire row or a selected column. Review the preview before downloading. When matching by a column, the first row for each value is kept.
How do I compare two CSV files?
Add both files, select a shared column with a unique value in each row, and choose “Find differences.” The report shows added, removed, and changed records across columns with matching names.
Are my files uploaded or stored?
No. Your files are read and processed in the browser. This tool has no account, analytics, external scripts, or upload endpoint.
What file formats and limits are supported?
Use UTF-8 CSV or TSV files up to 15 MB each. Files with uneven columns, duplicated headers, or broken quoting need fixing before processing.