Free online converters

Converters help change values and formats quickly, whether you are working with measurements, images, encoded text, data, or developer formats.

Convert common length, weight, and temperature units including kilometers, miles, kilograms, pounds, Celsius, and Fahrenheit.

Resize width or height while preserving aspect ratio.

Convert image dimensions to megapixels and estimated raw size.

Convert colors between HEX, RGB, and HSL.

Encode text to Base64 online.

Decode Base64 text online.

URL-encode text for query strings and paths.

Decode URL-encoded text online.

Convert JSON arrays to CSV with flattened nested objects.

Convert JSON to YAML with nested object support.

Everyday and developer conversions

Use the Unit Converter for common measurements, image tools for dimensions, and developer converters for encoded text and structured data.

Each converter is built for quick practical use, with input and output kept close together so results are easy to copy.

Some tools round results for readability. If a regulated workflow requires exact precision, use the required official standard.