Free tool, runs in your browser

Clean & Compare.

Fix a messy spreadsheet in one click, or compare two versions of a file to see exactly what changed.

Nothing uploadedNothing storedFree, no sign-up
CSVXLSXTSVXLS

Drop a messy CSV or Excel file

Spaces, duplicates, mixed dates, money stored as text: fixed in a click, with every change highlighted.

Your files are read on this device. Nothing is uploaded or stored.

Your file

What we found before cleaning.

Cleaning steps

Switch steps on or off. The preview updates instantly.

Preview

Highlighted cells were changed. Hover or tap one to see the original.

The same steps in Python

pandas code you can reuse to clean next month's file automatically.

1
Drop a fileCSV or Excel, as messy as it gets
2
Switch fixes onEvery change is highlighted
3
Download or continueCSV, Excel, SQL Studio or Data Canvas

What it fixes.

The problems that waste hours every week, solved in one click each.

Spaces and capitals

Stray spaces removed and names in proper Title Case, CAPITALS or lower case.

Mixed date formats

Every date in one clear format, whether it was written the UK or the US way.

Money stored as text

Currency symbols, commas and accounting brackets turned into real numbers.

Duplicate rows

Identical rows removed, or rows that share the same customer, order or ID.

Blanks filled

With a value, with zero, or with the value from the row above.

Compare two versions

See which rows were added, removed or changed between two files, cell by cell.

Why it's useful.

Hours of tidying, done in a click

Extra spaces, duplicates, mixed date formats, money stored as text, empty rows and blanks, all fixed at once.

Every change is visible

Changed cells are highlighted, with the original value one tap away. Nothing changes without you seeing it.

Know exactly what changed

Compare two versions of a file and see added, removed and changed rows, cell by cell.

See it in action.

A real example, from messy input to the output you need.

Your file

Customer NameOrder DateAmount
ada lovelace03/02/2026£1,250.00
BRUNO ROSSI 14/02/2026(45.50)
ada lovelace03/02/2026£1,250.00

Steps used: trim spaces, Title Case, standardise dates, fix money, remove duplicates.

Your result

customer_nameorder_dateamount
Ada Lovelace2026-02-031250
Bruno Rossi2026-02-14-45.5

Private by design.

Your data never leaves your device. There is no server to send it to, no account and nothing to store it in.

  • Nothing is uploadedFiles are opened by your own browser, on your own device. They never travel over the internet.
  • Nothing is storedClose the tab and your data is gone. There is no database, no account and no copy kept anywhere.
  • No tracking, no AINo analytics scripts, no cookies and no AI services see your data. The engines run locally.
  • Safe for work filesBecause nothing leaves your device, you can use it with confidential spreadsheets and database extracts.

Better together.

Every tool can send its result straight to the others. Clean it, query it, then see it.