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HTML Minifier Online: Smaller Pages Without Layout Surprises
Minify HTML online safely — what an HTML minifier removes, why whitespace can be layout-significant, and how minified markup helps Core Web Vitals.
CSS Minifier Online: Shrink Stylesheets Without Breaking Them
Minify CSS online in seconds — how minification works, what it actually saves alongside gzip and Brotli, and the render-blocking CSS problem it helps fix.
Date Difference Calculator: Count Days Between Dates Without Off-by-One Bugs
A date difference calculator that counts exact days, weeks, and months between two dates — and a guide to the off-by-one, DST, and month-length traps.
Cron Expression Parser: Decode Any Schedule Into Plain English
Use a cron expression parser to translate crontab syntax into plain English, preview next run times, and dodge the UTC and DST traps that break schedules.
HTML Entity Encoder Decoder: Escape, Unescape, and Stop Shipping & to Production
Encode and decode HTML entities online — named, decimal, and hex references — 100% client-side. A practitioner's guide from a WordPress plugin dev.
URL Encode and Decode Online: The Complete Guide to Percent-Encoding Without Breaking Your Links
URL encode and decode online with a free, client-side tool. Learn percent-encoding, RFC 3986, the %20 vs + mess, and how to fix double-encoded URLs.
What Is Inside a JWT? Header, Payload, Signature
Decode JWTs online with the free toolz.dev JWT Decoder — 100% client-side, instant header/payload split, readable timestamps. Tokens never leave your browser.
MD5 vs SHA-1 vs SHA-256 vs SHA-512 Explained
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly with a free hash generator online. 100% client-side — your data never leaves your browser.
What Makes a Password Strong? Entropy Explained
Generate strong random passwords online with the free toolz.dev Password Generator — cryptographically secure, 100% client-side, nothing uploaded.