Dev

Break a URL into its components — protocol, host, port, path, query parameters, hash — with each query param listed individually.

Parse a browser User-Agent string into structured browser/engine/OS/device fields.

Look up any HTTP status code — title, category, RFC explanation, and the situations it's actually used for.

Look up the MIME type for a file extension, or the canonical extensions for a MIME type — covering 100+ common types.

Calculate network/broadcast addresses, host range, mask, wildcard mask, host counts, and IP class from a CIDR.

Minify CSS — strip whitespace, comments and unused syntax to ship smaller stylesheets.

Pretty-print CSS — choose 2-space, 4-space or tab indentation for readable stylesheets.

Minify HTML — collapse whitespace, drop comments and optionally compress inline JS and CSS.

Pretty-print HTML — readable indentation with nested tags on their own lines.

Minify JavaScript with Terser — compress, mangle and ship the smallest possible bundle.

Pretty-print JavaScript — consistent indentation and one statement per line for readable code.

Format SQL queries for every major dialect — Postgres, MySQL, SQLite, BigQuery, Snowflake and more.

Pretty-print XML documents — indent nested tags with 2 or 4 spaces for readable markup.

Reformat YAML — normalize indentation, line wrapping and quoting for tidy config files.

Validate CSV data — check column consistency, count rows and surface parse errors.

Convert between px, rem and em based on a root font size — instant CSS-ready values, in-browser.

Build a modular typographic scale from a base size and ratio — px, rem and CSS variables, in-browser.

Resolve any CSS line-height (unitless, px or %) to its computed pixel height and ratio — in-browser.

Minify SVG markup — strip comments, declarations and whitespace to shrink file size, all in your browser.

Convert Apache .htaccess rewrite rules and directives to nginx configuration — free, in your browser.

Interactive regex reference — anchors, quantifiers, groups, character classes, lookaround, and flags with examples.

Validate JSON and see errors with line numbers — plus auto-format/beautify. Free, instant, in-browser.

Convert between numeric (755) and symbolic (rwxr-xr-x) Unix file permissions. Free, instant, in-browser.

Generate HTML meta tags for SEO, Open Graph, and Twitter Cards. Free, instant, copy-paste ready.

Build a Content-Security-Policy header interactively — select policies for each directive and get the full header string.

Test whether a URL path is allowed or blocked by robots.txt rules for a specific crawler.

Generate hreflang alternate link tags from language codes and localized URLs.

Find the numeric Instagram user ID for a public profile URL or username.

Find the numeric Facebook profile or page ID from a public URL, username, or ID link.