Step #1

First you need to calculate the dimensions of your image and mosaic.

Step #2

When you have your image to transform into a mosaic, you can convert it to a set of Lego 1x1 bricks.

Thanks

This tool is powered primarily by OpenAI's GPT API, with a small contribution from Steevan BARBOYON.
It's hosted by GitHub Pages.
You can view the source code (and participate).