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Popular Tools
JSON Formatter
Format, validate, minify, and prettify JSON data instantly.
Base64 Encoder/Decoder
Encode text or files to Base64 and decode back. UTF-8 safe.
JWT Decoder
Decode and inspect JWT tokens: header, payload, signature, expiration.
QR Code Scanner
Scan QR codes with your camera or from an image file: decoded entirely in your browser.
UUID Generator
Generate UUIDs and ULIDs: v4, v7, bulk mode, copy, download.
Regex Tester
Test regular expressions in real-time with match highlighting and groups.
URL Encoder/Decoder
Encode and decode URLs, query strings, and components. Parse URLs into parts.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes for text and files.
SQL Formatter
Format and beautify SQL queries for PostgreSQL, MySQL, SQLite.
Diff Checker
Compare text and code side by side with line-level highlighting.
toolbox
Browse by category
Developer
40 tools
Format, validate, and decode data in seconds: test regex, JWTs, and APIs without leaving your browser.
AI/ML
Count tokens before API costs surprise you, find ready-to-use prompts and datasets, and document models properly.
Converters
Move data between formats without data loss: JSON, YAML, Markdown, images, and more, entirely client-side.
Calculators
Estimate costs, sizes, and limits before you commit: API pricing, bandwidth, CIDR blocks, rate limits.
Generators
Create realistic test data, boilerplate schemas, and shareable artifacts like QR codes: no sign-up needed.
open source
Ship your first open source contribution
No idea where to start? Roll a random contribution task: then use the tools below to find a project and get it merged.
Improve a README
Pick a repo you use daily. Rewrite the quick-start so a stranger can run it in under 2 minutes.
academy
Learn & go deeper
13 guides · 12 roadmapsOpen Source Contribution: From First PR to Recognized Contributor
A complete guide to contributing to open source: finding projects, making your first PR, navigating reviews, and building a reputation that opens doors.
Developer Profile: Building a Presence That Opens Doors
Your GitHub profile, LinkedIn, and portfolio site are more valuable than your degree. A complete guide to building a developer identity that hiring managers notice.
Prompt Engineering for Production: Going Beyond the Basics
A deep dive into prompt engineering for production systems: tokenization, system vs user prompts, few-shot learning, chain-of-thought, structured outputs, testing for consistency, and prompt injection defense.
Frontend Developer Roadmap
From HTML fundamentals to production-grade frontend engineering with React, TypeScript, and modern tooling.
AI Engineer Roadmap
Build products on top of foundation models: prompting, RAG, fine-tuning, and production-grade LLM systems. No model training from scratch required.
MLOps Engineer Roadmap
Own the model lifecycle in production: experiment tracking, CI/CD for ML, monitoring, and governance.
Agentic AI Engineer Roadmap
Build autonomous AI systems that plan, use tools, and act: beyond single-shot prompting.
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