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
CSV Formatter & Validator
Format, validate, and preview CSV data with table view
Data
JSON to Excel
Convert JSON arrays to Excel spreadsheets
Data
HTML Table to CSV
Convert HTML tables to CSV — extract and download
Data
Number Formatter
Format numbers — commas, currency, words, binary, hex
Data
Data Visualizer (Charts)
Create charts from CSV data — bar, line, pie, doughnut
Data
SQL to JSON
Convert SQL to JSON — parse CREATE TABLE and INSERT INTO
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.