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Practical walkthroughs for every core tool, from JSON formatting to JWT decoding.
Learn how to format, prettify, and validate JSON online for free. Step-by-step guide using a private, browser-based JSON formatter.
Decode JWT tokens safely in your browser. No data sent to servers. See header, payload, and expiration instantly.
Generate cryptographically secure passwords for free. Customize length, characters, and complexity. No data leaves your browser.
Test and debug regular expressions in real-time. See matches highlighted, groups captured, and test against your own text — all in your browser.
Convert Unix timestamps (epoch) to readable dates and vice versa. Supports seconds and milliseconds. Free, private, browser-based.
Encode and decode Base64 strings online for free. Works with text, URLs, and binary data. 100% client-side — your data stays private.
Generate UUIDs (v4) online instantly. Free, private, browser-based UUID generator with bulk generation support.
Convert between HEX, RGB, and HSL color formats instantly. Free browser-based color converter for CSS and design work.
Format and beautify SQL queries online for free. Works with SELECT, INSERT, UPDATE, and complex joins. Private and instant.
Learn how to clean and optimize AI prompts for ChatGPT, Claude, and other LLMs. Remove noise, fix formatting, and get better responses.
Create SEO-optimized meta tags including Open Graph and Twitter Cards. Free tool with live HTML preview.
Convert XML to JSON format online for free. Fast, private, browser-based converter for API responses and data migration.
Create beautiful CSS linear and radial gradients with our free visual generator. Copy-ready CSS code with live preview.
Parse and understand cron expressions with our free tool. See next run times, human-readable descriptions, and validate cron syntax.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes online. Free, private, browser-based hash generator for file integrity and security.
Learn how to merge multiple PDF documents into a single file safely in your browser. zero-knowledge architecture ensure your documents are never uploaded to a server.
Extract specific pages or split a large PDF into multiple files. No uploads, no waiting. 100% browser-native PDF splitting.
Accurately estimate token counts and costs for your AI prompts. Supports GPT-4o, Claude 3.5 Sonnet, and Llama 3 tokenization heuristics.
The definitive list of the best VS Code extensions for 2026. Boost productivity with AI-driven coding, advanced debugging, and the best theme/UI tools.
Step-by-step guide to fixing 'Hydration failed because the initial UI does not match' in React 19 and Next.js 15. Learn about time-mismatches and window-objects.
Learn the modern workflow for Next.js 15 Server Actions. See how to use 'useActionState' and 'useFormStatus' for robust, type-safe forms.
The definitive guide to migrating your project to Tailwind CSS v4. Learn how to ditch your JS config for the new CSS-first engine.
Learn how to debug JSON Web Tokens (JWT) in 2026. Understand Header, Payload, and Signature sections, and see why client-side decoding is safer.
A step-by-step guide on how to turn SQL CREATE TABLE statements into professional ER diagrams using our interactive visualizer.