Excel & CSV Tools
Clean, convert, analyse
Work with spreadsheets in the browser: convert between XLSX, CSV and JSON, remove duplicate and blank rows, inspect formulas and profile your columns.
Spreadsheet work divides into two jobs that look similar and are not: converting a workbook into something another system will accept, and repairing data that arrived in a state nothing will accept.
Both run here through SheetJS and PapaParse, on the file in your browser. That matters for this category in particular, because the spreadsheets that need cleaning are almost always the ones full of real records — customers, employees, transactions.
19 tools · all client-side
Which one do I need?
- A system I am importing into wants CSV
Excel to CSV - A CSV that a spreadsheet keeps mangling
CSV to Excel - Feed it to an application or a script
Excel to JSON - The figures belong in a written report
Excel to Word - It is messy and I do not know where to start
Spreadsheet Cleaner - The same rows appear more than once
Remove Duplicate Rows - A column will not add up
Data Type Detection - Understand a dataset before using it
Column Statistics - Audit a workbook somebody else built
Excel Formula Viewer
Worth knowing
Dates are where spreadsheet data goes wrong most often, and it fails quietly. A spreadsheet stores a date as a number with a display format attached; CSV can carry only the rendered text, and a value like 03/04/2026 reads two ways. The misreading is invisible for any day above the twelfth and wrong for the rest, which is why it survives a casual check.