This tool converts pictures into symbols from Unicode Braille Patterns or blocks. To use this tool, first prepare an image. You can use any image, but the preferred ones are those with purely black and white pixels and size lower than 100 pixels in width and height. Load the image with the "Choose file" button and click on "Image to Dots". If you're satisfied with what you've got you can copy it from the output and share with others. If you see missing symbols, dowload a font that supports Braille Pattern block, like Symbola. With Full or Half blocks you can use the gray color. If you have a ready Unicode art and want to convert it back into an image, choose the correct format (Dots or Blocks) from the drop down, and click on Dots to Image. Some of the other things you can find on this page is the Brightness slider and Width and Height boxes. If you have a picture tht is too big you can set the width or height and set the appropriate Brightness. Here's an example of Braille art:
⠀⠀⠀⠀⠀⠀⠀⠀⢸⠱⡀
⠀⠀⠀⠀⠀⠀⠀⠀⡏⠂⢱
⠀⠀⢠⠒⡢⠔⠒⠉⠉⠑⠢⡧⠤⡀
⢀⡀⢘⠎⢄⠀⠀⠀⠀⢀⠀⠱⣠⠃
⠈⠪⢝⠤⡸⡍⣀⠀⠐⣽⠁⣀⠤⣓⠭⠂
⡠⢔⡪⢕⠊⠠⡫⠥⠔⡄⠪⠔⡻⢅⡀
⠈⠁⠀⠀⠉⠒⠬⣒⣊⠤⠔⠊⠉⠑⠊
New version can be found
here.