UUID generator

Random UUIDs from your browser's cryptographic generator. Version 4 is the familiar all-random one; version 7 puts a timestamp first so IDs sort by creation time — much friendlier as a database key.

This tool runs entirely in your browser — nothing you type or open here is ever uploaded. You can disconnect from the internet after the page loads and it still works.

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Epoch ↔ date, seconds or milliseconds, local and UTC.

🌈 Color converter

HEX, RGB, HSL, HSV, CMYK — plus WCAG contrast checks.

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Live word, character and sentence counts with reading time.

％ Percentage calculator

% of, what percent, and percent change — as you type.

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Exact age in years, months, days — and the next birthday.

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Exact days between two dates, with the calendar breakdown.

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