Data & Spreadsheet

9 tools available. All free, all private.

Convert between CSV, Excel, and JSON formats, format spreadsheet data, and visualize datasets — all without uploading files to any server. Perfect for data analysts, developers, and anyone working with structured data.

When to Use Data & Spreadsheet

  • Converting CSV files to JSON or Excel format
  • Converting Excel spreadsheets to CSV or JSON
  • Formatting and validating CSV data
  • Visualizing datasets with charts and graphs
  • Converting database query results between formats

Popular Data & Spreadsheet

Data

Excel to JSON

Convert Excel spreadsheets to JSON with sheet selection

Instant Private
Data

CSV to Excel

Convert CSV to Excel (.xlsx) with table preview

Instant Private
Data

Excel to CSV

Convert Excel spreadsheets to CSV format

Instant Private
Data

CSV Formatter & Validator

Format, validate, and preview CSV data with table view

Instant Private
Data

JSON to Excel

Convert JSON arrays to Excel spreadsheets

Instant Private
Data

HTML Table to CSV

Convert HTML tables to CSV — extract and download

Instant Private
Data

Number Formatter

Format numbers — commas, currency, words, binary, hex

Instant Private
Data

Data Visualizer (Charts)

Create charts from CSV data — bar, line, pie, doughnut

Instant Private
Data

SQL to JSON

Convert SQL to JSON — parse CREATE TABLE and INSERT INTO

Instant Private

Frequently Asked Questions

Can I convert large CSV files? ▼
Yes. Files up to several MB process smoothly. Very large files (50MB+) depend on your device memory.
Is my spreadsheet data safe? ▼
Yes. All data processing happens in your browser. Your spreadsheets and data files never leave your device.
What Excel formats are supported? ▼
XLSX (modern Excel), XLS (legacy), and CSV. We use the SheetJS library for reliable Excel parsing.

Related Categories

Developer Tools 109 tools
Math & Calculators 48 tools
SEO & Marketing 19 tools