Generate Open Graph and Twitter Card meta tags with image specs for perfect link previews. Fix blank Discord embeds in minutes — local generation, free, no signup.
Content reviewed October 2026 · About Toolzum
Browser device info, user-agent parser, HTTP status codes reference, MIME types lookup, Basic Auth header generator, Open Graph meta tags generator, and keycode inspector.
Generate realistic mock JSON from field specs — names, emails, dates, nested objects. Fill frontends before backends exist — local generation, free, no signup.
Generate correct CORS headers — Access-Control-Allow-Origin, methods, headers, credentials. Fix preflight failures with exact syntax — local generation, free, no signup.
Generate complete meta tag blocks — title, description, Open Graph, Twitter Cards, canonical — from one form. Ship correct head markup per page — free, local, copy-paste.
Generate valid robots.txt with user-agents, allows, disallows, and sitemap lines. Never accidentally deindex with Disallow: / — local generation, free, no signup.
Missing og:image, relative (not absolute) image URLs, or images under 200px. The generator enforces absolute URLs and 1200×630 dimensions.
1200×630 JPG/PNG under ~1 MB for universal cards; square 1080×1080 for profile-style previews. Absolute HTTPS URLs only.
Validators for X, Facebook, LinkedIn, and Discord re-scrape on demand — old cached previews need explicit refresh per platform.
No — generation runs locally in your browser. Nothing leaves your device.
JSON-LD Generator
Wrap JSON data in valid JSON-LD (Linked Data) structure with @context and @type. Generate schema.org-compatible structured data.
Avatar Generator
Generate initial-based avatars with custom colors, fonts, and sizes — profile placeholders in seconds. Ship default user pics that look designed — local Canvas work, free, no signup.