Dev Tools
FeaturedEssential developer tools and utilities to streamline your development workflow. Access a collection of powerful tools for coding, debugging, and productivity.
About Dev Tools
Dev Tools is a free online tool from Ytools. It runs on its own site, dev-tools.ytools.in, and the buttons on this page open it in a new tab. The guides below walk through real tasks where it helps.
Guides using Dev Tools
How to Compress Images for the Web: JPEG vs WebP vs AVIF
Choose the right image format, compress without visible quality loss, and serve WebP and AVIF safely with fallbacks. Includes a format decision table.
Web DevHow to Create an HTML Table: Code, CSS and Accessibility
Build an HTML table from scratch: the right tags, merged cells, responsive CSS and accessible headers, plus how to turn spreadsheet data into HTML.
Web DevHow to Create a robots.txt File: Rules, Examples, Mistakes
Create a correct robots.txt in minutes: syntax, copy-paste examples for common setups, how to test it, and the mistakes that accidentally block Google.
Web DevHow to Make a CSS-Only Loading Spinner (Accessible Code)
Build a CSS-only loading spinner with @keyframes, make it accessible with ARIA and reduced-motion support, and learn when a skeleton screen is better.
Web DevDeveloper Utilities: Which Free Tools You Need for Each Task
What developer utilities are, the six categories developers use daily, and how to check that a browser-based tool is safe before you paste data into it.
Web DevHow to Format JSON and XML: Indentation, Validation, Tools
Format and validate JSON and XML online, in JavaScript and Python, or on the command line. Learn the errors formatters catch and the ones they miss.
Getting started
Head to the official page for Dev Tools — most tools in this collection are free to use, with no account required to get going.
Open dev-tools.ytools.in