8 Tools
Developer Utilities
Developers need reliable utilities that work fast and respect privacy. Our developer tools include a regex tester with live match highlighting, HTML entity encoder/decoder, number base converter between binary/octal/decimal/hex, CSS unit converter supporting px/em/rem/%, cron expression builder with human-readable translation, UUID v4 generator in bulk, Unix timestamp converter, and HEX/RGB/HSL color converter. Every tool runs client-side with zero server dependencies. Your code, data, and secrets stay on your machine.
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Frequently Asked Questions
What regex syntax does the Regex Tester support?
The Regex Tester uses JavaScript regular expression syntax (ECMAScript). This includes support for flags (g, i, m, s, u, y), named capture groups, lookahead and lookbehind assertions, Unicode property escapes, and quantifiers. It does not support PCRE-specific features like recursive patterns.
Can I use the Cron Builder for AWS, GCP, or Azure?
The Cron Builder generates standard cron expressions that work across most platforms including AWS (EventBridge, Lambda), Google Cloud (Cloud Scheduler), Azure (Automation), and Linux/Unix systems. Some platforms use non-standard extensions — the builder's human-readable translation helps you verify compatibility.
What CSS units can I convert between?
The CSS Unit Converter supports px, em, rem, %, vw, vh, vmin, vmax, pt, pc, in, cm, and mm. The base conversion uses a configurable root font size (default 16px) for relative units like em and rem.