Data Conversion

Free Online Data Tools

Free online data conversion tools for CSV, JSON, XML, XLSX, TSV, and SQL. Convert between formats, clean messy data, and export to any target — all browser-based whenever possible. No signup, no account, no cost.

No signup requiredBidirectionalInstant preview

Data Tools

15 tools

Popular

CSV to XLSX

Convert CSV files to Excel (.xlsx) format — preserves columns and data types.

CSVXLSX

XLSX to CSV

Export Excel spreadsheets to plain CSV for universal compatibility.

XLSXCSV

New

CSV to JSON

Convert CSV files to a clean JSON array of objects instantly.

CSVJSON

New

JSON to CSV

Convert a JSON array of objects to a CSV file for spreadsheets.

JSONCSV

New

JSON to XLSX

Convert JSON arrays to Excel spreadsheets with proper formatting.

JSONXLSX

New

XLSX to JSON

Convert Excel spreadsheets to a JSON array for use in APIs and code.

XLSXJSON

New

CSV Cleaner

Remove empty rows, trim whitespace, and fix common CSV data issues.

New

CSV Splitter

Split large CSV files into smaller chunks by row count.

New

CSV Merger

Combine multiple CSV files into one with automatic header handling.

New

Remove Duplicates

Remove duplicate rows from CSV files — case-sensitive or insensitive.

New

CSV Delimiter Changer

Convert CSV to TSV, semicolon-separated, pipe-delimited, or any delimiter.

New

Sort CSV

Sort any CSV by column — ascending or descending, text or numeric.

New

XML to JSON

Convert XML documents to clean JSON format instantly in your browser.

XMLJSON

New

TSV to CSV

Convert tab-separated values (TSV) to comma-separated CSV format.

TSVCSV

New

CSV to SQL INSERT

Convert CSV rows to SQL INSERT statements — MySQL, PostgreSQL, SQLite, SQL Server.

CSVSQL

Data Conversion in Your Browser

These tools use open-source libraries that run client-side in your browser — including SheetJS for XLSX/CSV, and native JSON/XML parsing for the rest. Your data stays on your device and is processed locally whenever possible. No uploads, no account needed.

Open CSV ↔ XLSX Converter

How to convert data files online

Choose the tool you need — CSV to JSON, JSON to CSV, CSV to XLSX, XML to JSON, and more.
Drag and drop your spreadsheet file onto the drop zone, or click to browse.
The tool auto-detects your file format and sets the output automatically.
Click Convert, preview the first few rows, then download your converted file.

CSV and Excel — when to use each format

CSV (Comma-Separated Values) is a plain-text format that works with nearly every spreadsheet app, database, and data pipeline. It is the universal go-to when you need to move data between systems. XLSX (Excel Open XML) is Microsoft's spreadsheet format — it supports multiple sheets, cell formatting, formulas, and richer data types.

Use the CSV to XLSX converter when you need to open a CSV in Excel with proper formatting. Use the XLSX to CSV converter when you need to export data from Excel for use in a database, CRM, or data tool that expects plain CSV.

Privacy — your data stays local

ConvertForge's spreadsheet tools run in your browser using SheetJS. Your spreadsheet data is processed locally on your device whenever possible and is not sent to any server. This makes it a good fit for sensitive data like business records, financial exports, or contact lists — though you should always check with your organisation's data policies before using any online tool with confidential data.

Frequently Asked Questions

Is this spreadsheet converter free?

Yes — completely free to use. No account, no subscription, and no hidden limits on file size or number of conversions.

Does it support large CSV or Excel files?

Yes, up to the limits of your browser's available memory. Most CSV and XLSX files under a few hundred MB will convert without issue. Very large files may be slower to process depending on your device.

Is my spreadsheet data uploaded to a server?

No. Conversion runs in your browser using SheetJS. Your file data stays on your device and is processed locally whenever possible.

Does it work on Mac, Windows, and mobile?

Yes — any modern browser on Mac, Windows, Linux, iOS, or Android will work. No software installation required.

Will formulas and formatting be preserved?

When converting from XLSX to CSV, formulas are converted to their computed values. CSV is a plain-text format and does not support formatting or formulas. When converting from CSV to XLSX, the data is imported as-is into an Excel workbook.