Query String ↔ JSON

URL Parser

Break a URL down into its parts — protocol, host, port, path, query parameters, fragment.

User-Agent Parser

Break a User-Agent string down into browser, engine, operating system, and device type.

Basic Auth Generator

Generate or decode an HTTP Basic Authentication header — Base64(username:password).

HTTP Headers Parser

Parse raw HTTP headers (from curl -I, DevTools, raw response) into a field list with descriptions and a security headers check.

Cookie Parser

Parse a Set-Cookie header or a Cookie/document.cookie string into name, value, attributes, and a check for common security mistakes.

CORS Checker / Explainer

Explain step by step whether the browser will allow a cross-origin request — simple/preflight classification, Access-Control-* response header checks, and a verdict.

Number Base Converter

Convert between binary, octal, decimal, hexadecimal, and any arbitrary (2-36) base — enter a number into any field.

HTML Minify / Beautify

Compress HTML for production, or format minified markup into a readable layout.

XML Entities Encode/Decode

Encode and decode XML entities — the 5 predefined ones (ampersand, angle brackets, apostrophe, quote) and numeric character references.

CSS Minify / Beautify

Compress CSS for production, or format minified CSS into a readable layout.

CRLF ↔ LF Converter

Convert line endings between Windows (CRLF), Unix/macOS (LF), and classic Mac (CR), with mixed-ending detection.

Checksum Verifier

Verify the integrity of a file or text — paste the expected hash and the tool will detect the algorithm among 13 supported ones.