@startuml legend The plugin you are using seems to generated a bad URL. This URL does not look like DEFLATE data. It looks like your plugin is using HUFFMAN encoding. This means you have now to add an header ~1 to your data. For example, you have to change: http://www.plantuml.com/plantuml/png/06tq404I5ENsC6cXKT6xxgxaBDG3o_... to http://www.plantuml.com/plantuml/png/~106tq404I5ENsC6cXKT6xxgxaBDG3o_... It will work this way You may contact the PlantUML team at plantuml@gmail.com But you should also probably contact the plugin authors you are currently using and send them this image For the record, here is your data: 06tq404I5ENsC6cXKT6xxgxaBDG3o_tzkTRbkDJuRa4mYLIoIEFVZsapwhAr5NDHB0jrZfWK5MOp8y53 KKy_J2adzUr-HCAJ8bVfEA7x6qMwXhNtcUJYCT4gMZV_c2gzJk9gimqo81bOfXLN-tkYpiaWi3aabF_w rItuxPLX5NINL6FKhAboWjmXbI8jiBfIRnXs0h40re09D-HpekC83iDO8GEXFHTCMoPlXmKCx05mLK_f TdsZCJY1geDzQhs6aar6qIIfU1V5QYHQ5wvIFj8v6xZE0zWeZksK6S5mgnjDR9L1ao9uZg7-gFLepB1E eGVeUILgETgbkEtuAelaPmmGV7kEDjEioz1d6D_0WvvYzGbScBwP8CnA9ZosEQ2vGlBk_7W00 endlegend @enduml
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amiga
aws-orange
black-knight
bluegray
blueprint
cerulean-outline
cerulean
crt-amber
crt-green
cyborg-outline
cyborg
hacker
lightgray
mars
materia-outline
materia
metal
mimeograph
minty
plain
reddress-darkblue
reddress-darkgreen
reddress-darkorange
reddress-darkred
reddress-lightblue
reddress-lightgreen
reddress-lightorange
reddress-lightred
sandstone
silver
sketchy-outline
sketchy
spacelab
spacelab-white
superhero-outline
superhero
toy
united
vibrant
Pure Javascript
PNG
SVG
ASCII Art