Web dev tools

Small utilities for everyday web work: timestamps, colors with contrast ratios, and crawler rules — all computed in your browser.

Unix Timestamp Converter Online — Free & Instant
Convert Unix timestamps (seconds or milliseconds) to dates and back — ISO 8601, UTC, and relative time, instantly in your browser. Auto-detects units.
Color Converter Online — HEX, RGB, HSL, Contrast
Convert colors between HEX, RGB, and HSL with live WCAG contrast checks against white and black. Instant, free, and fully local in your browser.
Robots.txt Generator Online — Free, With AI Presets
Generate robots.txt with allow/disallow rules, crawl-delay, and sitemap directives — including one-click AI-crawler blocking. Free, instant, no signup.