@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-i402mFR3fSuLyXHXcs-V2ASo95D... to http://www.plantuml.com/plantuml/png/~106-i402mFR3fSuLyXHXcs-V2ASo95D... 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-i402mFR3fSuLyXHXcs-V2ASo95DZxcH22Uv16i3tpmfWDyCBecIQacpIcqxIK5uW7_a435ymWLf8G 7ZlmsdJr5NAfoZqUbOMAIdbIQs_tFhGv8PPKGufVRJJEQU8J4Y7OJJKWJAutGJ1kHrqa1Sqj4g5GAMkW aNk8btMyJhLUWjT_mVGIhHrXX9ww_N85qAxL1AQS-Fo70Tmnxlq8i29CagPRC-3NjfmwMyMhfY2a0EYD _PHmldAmWJ8fbq2ybWCu5NGS045RW0lvjAG-GuKEr1im76JeBQpfVN3nb9bwbJrYabO2ttwButAKCQrp Y3tf473P1R1NlWmbGkFyDJDjNEpx2FgTbwkgeRSZnDmCLyaR-Ti_9sZtyR9wctMkVEblUZ-ukOG9BYzY zPq0CwlqOu41sCAvuWtX-8__Ap07hAWXw28hk5OKCKMJs3JIEwjSjc48w_WdYzq7XBER8WgJ-vOsF_gb abpNavrghRlWB0grnXkvuWSya9y12naajy6QvIr5s_3xDE6yQGZoHdlmb1TnWHMVlIcyAylte2BsmwSL x1fjYo9uOin5Gcfkt9nNs_lvrLHBL-yGehpwzeWgFihkzG8I2_Cc36qjXe0kRt1RWg2XzaRT0aZdm_OQ PkEc9zjW15rY79LWTlvEzpzsntoa8Zw6EijayI4hd-zxz1W00 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