JoyTools — 100+ Free Online Developer & Business Tools (Zero Data Retention) - Showcase Project

JoyTools is an all-in-one suite of 100+ free online tools for developers, finance, e-commerce, PDF, and media processing at https://tools.joydii.com. Your data is never stored. Why JoyTools was built: Most online converters and code formatters force users to upload sensitive files (contracts, SQL queries, JWT tokens, ID photos) to remote cloud servers, often hiding high-resolution downloads behind credit paywalls or watermarks. JoyTools solves this with a Privacy-First Hybrid Architecture: 97% of utilities execute 100% locally inside your browser via Web Workers, Canvas, and WebAssembly, while compute-heavy AI tasks use stateless, ephemeral in-memory processing with strict zero data retention. Key Utility Suites (104+ Free Tools): • Developer & API Utilities (47+ tools): UUID v4/v7 Generator, JWT Decoder, Regex Tester, Base64/Hash/HMAC Generators, cURL to Python/Fetch/Axios/Go Converters, Webhook Signature Verifiers (Stripe, Shopify, GitHub), and OpenAPI to TypeScript/Zod Generators. • SQL & Code Formatters (7+ tools): Specialized dialect formatters for PostgreSQL, Google BigQuery, Snowflake, and Oracle PL/SQL, alongside JSON, YAML, and XML validators. • Private PDF Document Suite (12 tools): PDF Merge, PDF Split, Compress PDF to 1MB (tailored for visa, scholarship, and government portals), Compress PDF for Email, JPG to PDF, and PDF Watermarking. • Media, Design & AI Vision (16 tools): High-Res IS-Net AI Background Remover, Tesseract OCR (Image to Text in 12 languages), Compress Image to 50KB/100KB, 2x2 Inch Passport Photo Resizer, Shopify 2048x2048 Resizer, Discord Emoji Resizer, and EXIF/GPS Metadata Stripper. • AI & LLM Engineering (5 tools): AI Prompt Builder and real-time Token & Cost Calculators for OpenAI GPT-4o/o3, Anthropic Claude, and Google Gemini. • Finance & E-Commerce Calculators (10 tools): Shopee & TikTok Shop Seller Fee/ROAS Calculators, Amazon FBA Margin Calculator, Reverse VAT, and Gross-to-Net Payroll Tax Calculators. 100% free to use, zero registration required, and zero watermarks.