A downloadable tool

you can type math equations into most numbered fields, once you put an equals sign at the end the equation will be evaluated
try typing "3d8*5+2=" into a number field
as part of the math equations you can write dice, e.g. d6, 3d4 (dice: d2,d4,d6,d8,d10,d12,d20,d100) (the d100 and d10 start at 0 not 1)
checking all three saving throw boxes triggers a Minecraft totem animation
try typing any of these into the Conditions text box:
- #invert
- #hueflip
- #fry
- #deepfry
- #gray
- #glow
- #blur
- #dilate
- #erode
- #water
- #comic
- #impact
- #askew
"live file" means you don't have to keep picking the file, it writes when you press "save live file"
if you have unsaved changes and try to close the tab, it will tell you

Download

DnD Character Sheet.zip 195 kB

Install instructions

download and unzip the files into one folder (nothing else in that folder preferrably)

run index.html in a browser

tested on Chromium (Chrome, Edge, Opera GX)