Online Tools for SEO specialists,
Web designers, Webmasters and Developers

ExtendsClass is a free online toolbox for SEO specialists/webmasters, web designers and developers!

Simple tools to make developing and webmastering.

Free tools for SEO specialists, web designers and webmasters

To help the SEO specialists we provide SEO tools: On-page analyzer, keyword position.

We also provide tools for website management: word counter, Sitemap generator, CSS Generator.


Google search

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.

These tools allow to test REST & SOAP APIs, but also to query SQLite databases.


Code editor

Encoders and Decoders

Tools for web developers, in order to encode images or convert XML / JSON.

Include encoders, decoders, converter, validators, and code minifiers.


Convert document

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