# WebToolsHub — llms.txt # Standard: https://llmstxt.org # Last updated: 2026-06-11 > WebToolsHub is a free, privacy-first online toolbox for developers, designers, and content creators. > All tools run 100% in the browser — no sign-up, no data collection, no server processing. > URL: https://www.webtoolshub.online ## About WebToolsHub provides 100+ professional-grade web utilities spanning developer tools, AI tools, security, design, converters, and productivity. Tools are fast, secure, and always free. The site is built with Next.js 16, TypeScript, and MongoDB. All tool logic is client-side only. --- ## Developer Tools - [HTTP Status Code Lookup](https://www.webtoolshub.online/tools/http-status-code-lookup): Look up any HTTP status code (100–599) with descriptions, use cases, and SEO guidance. - [Regex Tester & Debugger](https://www.webtoolshub.online/tools/regex-tester-debugger): Live regular expression tester with match highlighting, flags, and group capture. - [SQL Query Validator](https://www.webtoolshub.online/tools/sql-query-validator): Validate and format SQL queries online — MySQL, PostgreSQL, SQLite, and SQL Server. Instant syntax checking with detailed error messages and line-number highlights. - [Cron Job Generator](https://www.webtoolshub.online/tools/cron-job-generator): Generate and explain cron schedule expressions in plain English. - [Unix Timestamp Converter](https://www.webtoolshub.online/tools/unix-timestamp-converter): Convert Unix timestamps to human-readable dates and vice versa, across timezones. --- ## AI & Finance Tools - [LLM API Cost Calculator](https://www.webtoolshub.online/tools/llm-api-cost-calculator): Calculate and compare API costs for GPT-4o, Claude Sonnet, Gemini 2.5 Pro, Mistral, Llama and 15+ models. Supports daily/monthly/yearly estimates, input vs output token breakdown, multi-currency, and use-case presets. - [AI Prompt Optimizer](https://www.webtoolshub.online/tools/ai-prompt-generator-optimizer): Refine and optimize prompts for LLMs using AI-powered suggestions. - [Stripe & PayPal Fee Calculator](https://www.webtoolshub.online/tools/stripe-paypal-fee-calculator-us-uk): Calculate exact payment gateway fees for Stripe and PayPal across US and UK regions. --- ## Content & SEO Tools - [Word & Character Counter](https://www.webtoolshub.online/tools/word-character-counter-tool): Count words, characters, sentences, paragraphs, and reading time instantly. - [SEO Meta Tag & Open Graph Generator](https://www.webtoolshub.online/tools/seo-meta-tag-open-graph-generator): Generate complete SEO meta tags and Open Graph markup with live preview. - [Robots.txt Generator](https://www.webtoolshub.online/tools/robots-txt-llms-txt-generator): Generate robots.txt and llms.txt files with AI assistance. --- ## Security & Cryptography Tools - [Bcrypt Hash Generator & Verifier](https://www.webtoolshub.online/tools/bcrypt-hash-generator-verifier): Generate and verify Bcrypt password hashes with configurable salt rounds. - [JWT Decoder & Verifier](https://www.webtoolshub.online/tools/jwt-decoder-verifier): Decode and cryptographically verify JSON Web Tokens (JWT) with any HMAC or RSA secret. - [JWT Secret Key Generator](https://www.webtoolshub.online/tools/jwt-secret-key-generator): Generate cryptographically secure signing keys for JWT tokens. --- ## Design & Layout Tools - [Shadcn Theme Generator](https://www.webtoolshub.online/tools/shadcn-theme-generator): Visual theme builder and color palette generator for Shadcn UI components. - [Bento Grid Builder](https://www.webtoolshub.online/tools/bento-grid-builder): Interactive drag-and-drop Tailwind CSS grid layout builder with live code export. - [SVG Pattern Generator](https://www.webtoolshub.online/tools/tailwind-svg-background-generator): Create beautiful repeating SVG background patterns with custom colors and scales. - [SVG Path Builder & Visualizer](https://www.webtoolshub.online/tools/svg-path-builder-visualizer): Interactive vector path editor with live SVG/CSS code output. - [QR Code Generator](https://www.webtoolshub.online/tools/qr-code-generator): Create custom QR codes for URLs, WiFi networks, vCards, and plain text. --- ## Converter Tools - [PX to REM Converter](https://www.webtoolshub.online/tools/px-to-rem-converter): Convert pixels to rem and rem to pixels instantly. Bidirectional, custom base font size, bulk conversion, CSS snippet output, and a 1–100px reference table. - [PX to EM Converter](https://www.webtoolshub.online/tools/px-to-em-converter): Convert pixels to em and em to pixels with parent font size control. Bidirectional, bulk converter, CSS snippet, Tailwind output, and a full 1–100px reference table. - [JSON to TypeScript (JSON to TS)](https://www.webtoolshub.online/tools/json-to-ts): Convert JSON or JavaScript objects to TypeScript interfaces and types instantly. - [CSS to Tailwind Converter](https://www.webtoolshub.online/tools/css-to-tailwind-converter): Convert legacy CSS rules to equivalent Tailwind CSS utility classes. - [Tailwind Class Sorter](https://www.webtoolshub.online/tools/tailwind-class-sorter): Sort and group Tailwind CSS class names by category for cleaner markup. - [HTML to JSX / TSX Converter](https://www.webtoolshub.online/tools/html-to-jsx-tsx-converter): Transform raw HTML into React-compatible JSX or TSX component code. - [Markdown to HTML Converter](https://www.webtoolshub.online/tools/markdown-to-html-converter): Convert Markdown to HTML with live GitHub Flavored Markdown (GFM) preview. - [SVG to JSX / TSX Converter](https://www.webtoolshub.online/tools/svg-to-jsx-tsx-converter): Clean and convert SVG icons to React JSX or TSX components. - [Image to WebP Converter](https://www.webtoolshub.online/tools/image-to-webp-converter): Convert PNG, JPG, and GIF images to WebP format for web performance optimization. - [Fancy Font Generator](https://www.webtoolshub.online/tools/fancy-font-generator): Generate stylish Unicode fonts for Instagram bios, PUBG names, and social media. --- ## Productivity Tools - [Pomodoro Focus Timer](https://www.webtoolshub.online/tools/pomodoro-focus-timer-aesthetic): Aesthetic customizable focus timer with 25/5 and 50/10 Pomodoro cycles, ambient sounds, and dark mode. --- ## Blog — Featured Articles - [LLM API Pricing Guide 2026](https://www.webtoolshub.online/blog): In-depth guides on AI tools, developer workflows, and web development. - [What is AGENTS.md? Next.js Guide 2026](https://www.webtoolshub.online/blog/what-is-agents-md-how-to-write-nextjs-2026): How to write AGENTS.md for Next.js — the cross-tool AI agent instruction file that replaces .cursorrules and CLAUDE.md. - [What is llms.txt? How to Add It (2026)](https://www.webtoolshub.online/blog/what-is-llms-txt-how-to-add-website-2026): Complete guide to the llms.txt standard — what it does and how to add it to any website. - [Claude Code vs Cursor vs GitHub Copilot 2026](https://www.webtoolshub.online/blog/claude-code-vs-cursor-vs-github-copilot-2026): Side-by-side comparison of the top AI coding assistants. - [What is MCP (Model Context Protocol)?](https://www.webtoolshub.online/blog/what-is-mcp-model-context-protocol-guide-2026): Complete guide to the inter-agent communication standard. - [Microsoft Build 2026 Developer Announcements](https://www.webtoolshub.online/blog/microsoft-build-2026-developer-announcements): Every major announcement from Build 2026 explained. - [GitHub Copilot Agent Mode vs Cursor 2026](https://www.webtoolshub.online/blog/github-copilot-agent-mode-2026-vs-cursor): Honest comparison of GitHub Copilot Agent Mode and Cursor in 2026. - [Vibe Coding Complete Guide 2026](https://www.webtoolshub.online/blog/vibe-coding-complete-guide-2026): What vibe coding is and what it means for developers. - [Autonomous AI Agents & Agentic Workflows](https://www.webtoolshub.online/blog/guide-to-autonomous-ai-agents-agentic-workflows): How to build and run reliable agentic AI systems. --- ## Key Pages - [All Tools](https://www.webtoolshub.online/tools): Browse all 100+ free tools by category. - [Blog](https://www.webtoolshub.online/blog): Expert articles on AI, developer tools, and web development. - [About](https://www.webtoolshub.online/about): About WebToolsHub and our mission. - [Privacy Policy](https://www.webtoolshub.online/privacy): Our privacy-first, no-tracking policy. --- ## Technical Details for AI Agents - **Framework**: Next.js 15 App Router with TypeScript - **Rendering**: ISR (Incremental Static Regeneration) — pages revalidate every 24 hours - **Schema Markup**: Every tool page includes `SoftwareApplication` and `FAQPage` JSON-LD - **Sitemap**: https://www.webtoolshub.online/sitemap.xml - **All tools are**: Free, browser-only, no login required, no data sent to servers - **Supported AI Crawlers**: GPTBot, ClaudeBot, Google-Extended, PerplexityBot, Bingbot (all explicitly allowed in robots.txt)