@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/06-m509m5TiFrPbfm4Wl3DWmqFaKeG... to http://www.plantuml.com/plantuml/png/~106-m509m5TiFrPbfm4Wl3DWmqFaKeG... 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: 06-m509m5TiFrPbfm4Wl3DWmqFaKeGO22h5pJnwYT-mAmwzIYuqnoJrX0oCNv2mu7tG998mgmR96Zkrh JXEqh6HUXCoyZJPP3L4B7mk3TR0bbAXIwgewlCErYNWDVSw1s9tG2-Cyzy4NAwYP3osUGApPXDoi-XXt Ulj1Uxcjqtlsu0lVQeb6lE72K83FO38Fw6tm1kd-BGnXHodOq3W1GgSJ4NwbOr7IJXMIHg14TUKwo7YD rY6cZ-d540awmIkxtgY6hrl7XtUStksjE0-aXRxAN2HsKjOW0Sxqk6mciDMYfRDGdEYRNI8FzXhxkBv4 7UzwDf1prju5Lz9RExMP6pV_np1ZbTulrj1ULdNtt9-dzqgzds6eHe0mX8M7SY7MAP67L48mdx6VWh-D 2zeuwKzNCNPjf7w85ocAWsXKQ_C3w2lzbrW9mH4XOylbmhxaeLYGEmBHCKe-ESXQxtamxNfn4wSV8z2a PU572AT8nOBfaZ318q5XymB6I_eA_AfJIkA1H4bQSyPIlyniJv8o_x3z4ITJuXJhkAXl4I9oxrC-fQvq vg5PfhxbKK1_kfLLpYD_r3BC5npwp-xS9Q8veZhiMseX3pARrmrUpsAaltEy0zUztIcWJWLKN98pK5m9 xOiXnd8cGdba4o8O3z7rM0c15WQo-AVwqPrlV0ny0 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