Converter Tools

Free online converter tools. All processing happens in your browser — your data never leaves your device.

Unit Converter

Convert between units of length, weight, temperature, and more

CSV to JSON

Convert CSV data to JSON format

JSON to CSV

Convert JSON arrays to CSV format

HTML to Markdown

Convert HTML to Markdown format

Markdown to HTML

Convert Markdown to clean HTML format

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal

Image to Base64

Convert images to Base64 data URIs for embedding

What Are Online Converter Tools?

Online converter tools transform data between different formats instantly in your browser. toolsfreely.com offers a unit converter for length, weight, temperature, and volume, plus converters for CSV to JSON, JSON to CSV, and HTML to Markdown. All conversions happen locally — no data is sent to any server.

How to Convert Data Online for Free

Choose a converter above, paste or upload your data, and download the converted result. The CSV to JSON converter handles headers automatically. The unit converter supports dozens of unit types with instant results as you type.