Private spreadsheet, CSV and JSON tools
Convert spreadsheets, CSV and JSON instantly in your browser. Files stay on your device, with no uploads, no signup and no server-side processing.
Excel to CSV
Convert XLSX or XLS sheets to downloadable CSV files.
CSV to Excel
Paste or upload CSV and create an XLSX workbook.
XLSX to JSON
Turn an Excel sheet into an array of JSON objects.
JSON to Table
Preview JSON arrays as a table and export them as CSV.
CSV Cleaner
Trim, dedupe, normalize and remove columns from CSV files.
CSV to Chart
Plot CSV columns as a bar, line, pie or scatter chart and save a PNG.
SQL Insert Generator
Turn CSV rows into ready-to-run SQL INSERT statements.
CSV Find & Replace
Find and replace text across CSV cells with regex and column filters.
Pivot Table
Summarize CSV data with row, column and value aggregation, then export CSV.
SQL on CSV
Query CSV, TSV, JSON and Parquet files with SQL in your browser using DuckDB.
Parquet Viewer
Open Parquet files to see schema, row count and paged rows, then export CSV or JSON.
JSON to CSV
Flatten nested JSON into CSV with dot-path columns, custom delimiter and header toggle.
CSV Merge
Combine CSV files by appending rows or joining on a shared key column.
Private data conversion, right in your browser
Data Tools helps you convert spreadsheets, CSV files and JSON data without sending anything to a server. Every parser and exporter runs locally in your browser, so sensitive lists, reports, customer exports and working datasets stay on your device from start to finish.
Use Excel to CSV or XLSX to JSON when you need data out of a workbook, CSV to Excel when a spreadsheet file is easier to share, JSON to Table for quick inspection, and CSV Cleaner to tidy messy exports before import.