Developer Blog

Help search engines find and index your pages correctly with properly configured sitemap.xml and robots.txt files — generated in seconds.

Learn the essential Open Graph meta tags that control how your pages appear when shared on Facebook, Twitter, LinkedIn, and Slack.

Convert between bytes, temperatures, lengths, and more without opening a calculator app — purpose-built tools for developer workflows.

Stop writing throwaway scripts to convert between data formats. Here's a guide to CSV, JSON, YAML, and XML — plus instant converters for each.

Learn how HMAC works, where it's used in webhooks and APIs, and generate or verify HMAC-SHA256 signatures instantly.

Understand CIDR notation, subnet masks, and host ranges — with an interactive calculator that does the math for you.

Understand CSP directives, prevent XSS attacks, and generate production-ready Content-Security-Policy headers without trial and error.

Learn what bloats SVG files and how to strip metadata, comments, and unnecessary attributes — cutting file size by 30-60% instantly.

Learn what makes a password truly secure, why length beats complexity, and generate cryptographically random passwords instantly.

Finally understand rwx, octal notation, and common permission patterns — with an interactive calculator to get chmod right every time.

Stop guessing which CSS layout system to use. Learn the clear rules for choosing between Flexbox and Grid — with visual playgrounds to practice.

Understand the three parts of a JWT, how signing works, and why you should never store sensitive data in tokens — plus decode any JWT instantly.

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.