Category
Dev
Code formatters, minifiers, beautifiers — HTML, CSS, JS, SQL, XML, YAML.
15 free dev tools — no sign-up, runs in your browser.
URL Parser
Break a URL into its components — protocol, host, port, path, query parameters, hash — with each query param listed individually.
User-Agent Parser
Parse a browser User-Agent string into structured browser/engine/OS/device fields.
HTTP Status Code Lookup
Look up any HTTP status code — title, category, RFC explanation, and the situations it's actually used for.
MIME Type Lookup
Look up the MIME type for a file extension, or the canonical extensions for a MIME type — covering 100+ common types.
IPv4 Subnet Calculator
Calculate network/broadcast addresses, host range, mask, wildcard mask, host counts, and IP class from a CIDR.
CSS Minifier
Minify CSS — strip whitespace, comments and unused syntax to ship smaller stylesheets.
CSS Beautifier
Pretty-print CSS — choose 2-space, 4-space or tab indentation for readable stylesheets.
HTML Minifier
Minify HTML — collapse whitespace, drop comments and optionally compress inline JS and CSS.
HTML Beautifier
Pretty-print HTML — readable indentation with nested tags on their own lines.
JavaScript Minifier
Minify JavaScript with Terser — compress, mangle and ship the smallest possible bundle.
JavaScript Beautifier
Pretty-print JavaScript — consistent indentation and one statement per line for readable code.
SQL Formatter
Format SQL queries for every major dialect — Postgres, MySQL, SQLite, BigQuery, Snowflake and more.
XML Formatter
Pretty-print XML documents — indent nested tags with 2 or 4 spaces for readable markup.
YAML Formatter
Reformat YAML — normalize indentation, line wrapping and quoting for tidy config files.
CSV Validator
Validate CSV data — check column consistency, count rows and surface parse errors.
Frequently asked
Are Toolsly developer tools free?
Yes. Formatters, minifiers, beautifiers, and validators for HTML, CSS, JS, SQL, XML, YAML, and JSON are all free.
Do these tools run offline?
Yes. All developer tools on Toolsly are client-side, so once the page is loaded they work without a network connection.
Can I use these in a script or CI?
Toolsly is a UI for one-off transformations. For scripting, the underlying libraries (Prettier, esbuild, jsbeautify, etc.) are open source and run in Node.