The spreadsheet and csv conversion desk
toolbox.
Turn Excel workbooks into CSV and CSV into real XLSX files, inspect the text, then profile and chart the result, all on your device.
Keep this toolbox for offline use
10 useful places to start.
Workbooks are read and written in the browser. Formulas are read as the values last saved in the file; nothing is recalculated.
Excel (XLSX) to CSV converter
Turn a sheet (or every sheet) of an Excel .xlsx workbook into CSV, with real dates, your choice of separator and quotes, and a report of formulas, merged cells and hidden sheets.
CSV to Excel (XLSX) converter
Turn pasted or uploaded CSV into a real .xlsx workbook: numbers, dates and yes/no values as proper cells, a bold frozen header with filters, sensible column widths and no formula risk.
Text file inspector (encoding, line endings, hidden characters)
Check a text or CSV file for its encoding, byte order mark, line endings, mixed tabs and spaces, trailing spaces and invisible Unicode characters, and download a cleaned copy.
CSV viewer
Open a CSV as a readable table, without uploading it.
CSV column profile
Inspect missing values, distinct values and numeric summaries by column.
CSV to JSON
Turn CSV rows into a JSON array of objects.
JSON to CSV
Convert a JSON array of objects into a downloadable CSV.
Correlation matrix with heatmap
Compute a Pearson, Spearman or Kendall correlation matrix from CSV columns, with p-values and a colour heatmap.
CSV chart builder
Turn a local CSV into a bar, line or scatter chart with editable columns and SVG export.
CSV heatmap builder
Explore a numeric matrix as a labelled heatmap, with readable values and SVG export.
A few things you
can tick off.
- Convert a workbook sheet to CSV
- Make an XLSX with text columns preserved
- Check a CSV for mixed line endings