Spreadsheet & Data Tools
Convert, view, edit, merge, split, compare and clean spreadsheets and CSV files in your browser. Excel files, CSV and JSON never leave your device, and every tool keeps working offline once its page has loaded.
All Spreadsheet & Data tools
Excel to CSV
Export one worksheet as CSV with your delimiter, encoding and value format.
Use ToolCSV to Excel
Turn CSV into an .xlsx workbook with safe column types and leading zeros kept.
Use ToolExcel to JSON
Worksheet to JSON objects or rows, with header mapping and blank-cell control.
Use ToolJSON to Excel
JSON arrays to .xlsx with flattening, nested-array options and exact big IDs.
Use ToolCSV Viewer & Editor
View, search, sort and edit CSV; export all or filtered rows safely.
Use ToolCSV Merger
Combine many CSV files by header name, with strict or union modes.
Use ToolCSV Splitter
Split CSV by row count or column value; download parts or a ZIP.
Use ToolDuplicate Row Remover
Deduplicate CSV rows by all or chosen columns; keep first or last.
Use ToolColumn Extractor / Reorderer
Pick, rename and reorder CSV columns, then download.
Use ToolCSV Compare
Diff two CSVs by key: added, removed and changed rows with old/new values.
Use ToolTranspose Table
Swap rows and columns of CSV or pasted tables; copy as TSV.
Use ToolData Cleaning Tool
Trim, normalise, fix case and reformat dates and numbers in CSV.
Use ToolHow these tools handle your data
- Files are read and written in your browser. Nothing is uploaded, and nothing is stored unless a tool says so.
- Excel support is for .xlsx workbooks. Formulas are never recalculated; the results saved in the file are used and missing results are reported.
- CSV exports are spreadsheet-safe by default: text that could run as a formula gets a leading apostrophe, while numbers such as -12.5 are left alone.
- Leading zeros, long ID numbers and Unicode text are kept exactly unless you choose a conversion.
- Large files are previewed page by page; downloads always contain the full data.