Online Tools for IT professionals

SEO specialists, Web designers, Webmasters and Developers

Developer tools

ExtendsClass provides tools directly usable in a browser. It saves you from having to install add-ons to your browser in order to add features.

You have at your disposal syntax validators, code formatters, testers, HTTP clients, mock server, but also a SQLite browser.

These are small and easy-to-use tools that can help when you do not want to install software on your workstation.


Code editor

Encoder, decoder, Converter, Formatter, Compare tool

The available tools allow you to convert data (CSV, TSV, XML and JSON), compare data (Text, XML, JSON), format data (XML, JSON) and also encode and decode base 64 data.


Convert document

Free tools for Web designers and webmasters

ExtendsClass's tools lets you manage your websites.


Google search

Free tools for SEO specialists

ExtendsClass's tools allow you to optimize and manage your websites.

You have at your disposal minifiers, optimizers and checkers.


Google search


The tools are provided "as is", without warranty of any kind, either express or implied.