Conversion tools

Small transformations that save time and prevent mistakes: changing naming conventions, converting between Unix and human-readable dates, and adjusting text for the target language or platform.

Case

Case Convert

Convert text between camelCase, snake_case, kebab-case, and more.

Time

Time Converter

Convert between Unix timestamps, ISO 8601, RFC 2822, and human-readable time.

Date Difference Calculator

Calculate the difference between two dates in years, months, days, weeks, hours, and business days. Handles leap years and timezones.

Base

Number Base Convert

Convert numbers between binary, octal, decimal, and hexadecimal.

Units

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin.

Roman Numerals

Convert between Roman numerals and decimal numbers.

About convert tools

Case conversion matters for code and content. camelCase is standard in JavaScript, snake_case in Python and SQL, kebab-case in URLs and CSS classes, CONSTANT_CASE for environment variables. Converting by hand invites typos; these tools are exact.

Timestamp conversion moves between Unix seconds, Unix milliseconds, ISO 8601, RFC 2822, and local time. It is used in logs, database fields, and API responses. Getting the timezone wrong shifts events by hours, so the tool shows every representation side by side.

More conversions will be added over time. If there is a transformation you use often, it can be added as a new tool in this group.