Detect your browser version, OS, screen resolution, user agent, and capabilities online for free.

Calculate web font file sizes across WOFF2, WOFF, and TTF. Model glyph subsetting byte savings, OpenType tables, and generate CSS unicode-range and pyftsubset commands.

Calculate vector database RAM and storage sizing for Pinecone, Qdrant, Milvus, and pgvector. Model vector dimensions, quantization, and HNSW graph overhead.

Generate bulk cryptographically secure RFC 4122 compliant UUID v4 identifiers with custom formatting, uppercase options, and instant download.

Generate random UUID v4 identifiers instantly. Create single or bulk UUIDs with uppercase, lowercase, and no-dash options. Copy or download — free, no signup.

Build UTM-tagged campaign URLs for Google Analytics. Add source, medium, campaign, term, and content parameters. Copy or download tagged URLs.

Clean messy URLs, remove tracking parameters, decode encoded URLs, and strip unnecessary fragments.

Parse and inspect any URL components including protocol, host, port, path, fragment, and query parameters formatted into a clean table or JSON.

Encode special characters in URLs or decode percent-encoded URL strings. Handle query parameters, Unicode, and spaces safely. Free, instant, browser-only.

Convert Unix epoch timestamps in seconds and milliseconds to human-readable date formats (UTC and local time), and convert dates to epoch timestamps.