Free Conversion Tools
Convert between formats and units in your browser — data formats (JSON, YAML, XML, CSV, SQL), number bases (binary, hex, octal, decimal, ASCII), and physical units.
8 tools in this category · 100% free · No signup
All Converters
JSON to CSV Converter
Convert JSON arrays to CSV.
Open →CSV to JSON Converter
Convert CSV to JSON arrays.
Open →CSV to SQL INSERT
Generate SQL INSERT statements from CSV.
Open →Binary to Hex Converter
Convert binary numbers to hexadecimal.
Open →Hex to Binary Converter
Convert hexadecimal to binary numbers.
Open →Decimal to Binary Converter
Convert decimal numbers to binary, hex, octal.
Open →ASCII to Hex Converter
Convert text to ASCII hex codes and back.
Open →Unit Converter
Convert between length, weight, temperature, and time units.
Open →Why so many data format converters?
Every system speaks a different format. APIs prefer JSON. Config files use YAML. Legacy systems demand XML. Spreadsheets export CSV. Databases ingest SQL. Migrating data between any two of these is constant work for developers. These converters handle the most common transformations — paste in, get out, no signup, no upload. For complex multi-step pipelines, prefer a real ETL tool (Airbyte, Singer, custom scripts).
Number base conversion fundamentals
Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) are different ways to write the same number. Each hex digit equals four binary digits — that's why hex is the standard way to write memory addresses and color codes. Octal is mostly used in Unix file permissions (777, 644). ASCII codes convert characters to numbers — useful for debugging text encoding issues or constructing escape sequences in code.
Unit conversion sanity
Length, weight, and time conversions are linear: multiply by a constant. Temperature is the exception — Celsius, Fahrenheit, and Kelvin have different zero points, so conversion is affine (multiply, then add). The Unit Converter on this page handles both cases. For currency, use a real-time API — exchange rates change too fast for a static tool.