Email Signature Generator

Analyze keyword density for English words and Chinese bigrams for SEO

Parse URL into protocol, domain, path, query params, fragment with auto-decode

Visual robots.txt generator with one-click allow/disallow all

Generate SEO meta tags: title, description, keywords, and Open Graph

Parse User-Agent to identify browser, OS, engine, and device info

Validate, pretty-print or minify JSON with error line:col reporting

Merge multiple PDF files in sequence, all processed locally in browser

Generate cryptographically secure passwords with custom length and charset