  Estimates of interstellar extinction are essential in a broad range of
astronomical research. In the last decades, several maps and models of the
large scale interstellar extinction in the Galaxy have been published. However,
these maps and models have been developed in different programming languages,
with different user interfaces and input/output formats, which makes using and
comparing results from these maps and models difficult. To address this issue,
we have developed a tool called GALExtin (\url{http://www.galextin.org}) - that
estimates interstellar extinction based on both 3D models/maps and 2D maps
available. The user only needs to provide a list with coordinates (and
distance) and to choose a model/map. GALExtin will then provide an output list
with extinction estimates. It can be implemented in any other portal or model
that requires interstellar extinction estimates. Here, a general overview of
GALExtin is presented, along with its capabilities, validation, performance and
some results.
