Developer Blog

Learn how QR codes work under the hood, what data they can hold, and how to generate them instantly for URLs, WiFi, and more.

Understand percent-encoding, reserved characters, and why your URLs break — then fix them instantly with the right tools.

Learn what Base64 encoding actually does, when to use it, and when not to — plus encode and decode strings and images instantly.

Understand the cryptography behind SSH keys and generate a secure key pair directly in your browser — no terminal required.

Edit, annotate, merge, split PDFs entirely in your browser — nothing uploaded to any server.

Generate realistic test data — names, emails, addresses — without writing fixtures manually.

Build cURL commands visually — method, headers, auth, body — without memorizing flags.

Visual CSS generators for gradients, shadows, animations, and clip-paths — all free.

Convert Markdown to HTML effortlessly — GFM tables, code blocks, and live preview.

Compare Nginx and Apache configuration — performance, security, and generator tools.

Convert between XML and JSON — use cases, gotchas, and free browser-based tools.

Understand WCAG contrast ratios, AA vs AAA compliance, and how to test your colors.

Validate docker-compose.yml files instantly — catch typos and version issues before deploying.

A practical comparison of CSS preprocessors — features, performance, and when to use each.

Environment variables done right — validation, best practices, and common mistakes.

Master JSON manipulation with practical tips — from key sorting to schema validation.

Describe endpoints get API documentation

Essential security tools for generating keys, HMAC signatures, CSP headers, and more.

Enter stack get optimized .gitignore

Describe project get full README.md