Utility

Convert numbers between decimal, binary, octal and hexadecimal.

Convert between bytes, KB, MB, GB, TB and their binary equivalents.

Convert between px, rem, pt, cm and temperature, data, and time units.

Calculate aspect ratios from dimensions with visual preview and CSS output.

Calculate percentages: what % is X of Y, X% of Y, and percentage change.

Calculate Unix file permissions in octal and symbolic notation.

25/5 focus timer with sessions tracking and browser notifications.

Quick scratchpad with multiple tabs. Auto-saves to your browser.

Format numbers with locale, currency, compact notation, and base conversions.