Generators & Utilities – UUID, Fake Data, Subnet Calculator, Chmod & More
Generators built on the browser’s cryptographically secure random source, plus small utilities you reach for during setup and deployment.
ID UUID Generator Generate random UUID v4 or time-ordered UUID v7 in bulk using cryptographically secure randomness. Uppercase and no-hyphen options. # Hash Generator Calculate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files. Uses the Web Crypto API and runs fully offline in your browser. *** Password & API Key Generator Generate strong random passwords and secret tokens (hex, base64url, base62) with the Web Crypto API. Shows entropy in bits, excludes look-alike characters on request, and never sends anything over the network. QR QR Code Generator Create QR codes for URLs, text, Wi-Fi networks and contact details. Choose size, colors and error correction, then download a PNG or a crisp SVG. Generated locally; codes never expire. 755 Chmod Calculator Tick read/write/execute boxes or type 755, rwxr-xr-x or u+x,go-w, and get the matching octal, symbolic notation and ready-to-copy chmod commands. Supports setuid, setgid and sticky bits. /24 IP Subnet (CIDR) Calculator Calculate network and broadcast addresses, usable host range, subnet mask and wildcard for any IPv4 CIDR block. Check whether an IP is in a subnet, split networks and convert IP ranges to CIDR. UA User-Agent Parser Parse any User-Agent string into browser, rendering engine, operating system and device type. Identifies search engines and AI crawlers such as GPTBot, ClaudeBot and PerplexityBot, and generates a robots.txt to block them. Abc Fake Data & Lorem Ipsum Generator Generate realistic fake records — names, emails, phones, addresses, companies, dates, UUIDs — in English or Chinese, as JSON, JSONL, CSV or SQL INSERT. Also generates Lorem ipsum and Chinese placeholder text.