Email Header Analyzer

URL Parser

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

Query String ↔ JSON

Parse a URL query string into a JSON object, or build a query string back from JSON.

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.

Base64

Base64 encode and decode — text and files, right in your browser.

QR Code Generator / Reader

Generate a QR code from text or a URL, or read the content of an uploaded QR code image.

Word/Character Frequency Counter

Frequency analysis of text: how many times each word or character appears, sorted by count.

Case Converter

Convert text or an identifier into every common naming style at once — camelCase, snake_case, kebab-case, and more. Recognizes word boundaries in camelCase/PascalCase, acronyms (XMLParser → XML + Parser), and around digits.

String Escape

Escape text into a string literal (quotes, backslash, control characters) for pasting into code, or unescape it back.

sitemap.xml Validator

Check sitemap.xml — required fields, date formats, sitemaps.org limits, duplicate URLs.