Upload maps once, edit them in the library, then drop them into any party from play mode.
StatBlocker accepts standard image formats and Universal VTT files:
.png, .jpg, .jpeg, .webp —
plain map images. Click any map after upload to open the editor and set its grid, fog, and lighting.
.uvtt, .dd2vtt, .df2vtt —
Universal VTT exports from Dungeondraft, Arkenforge, and similar tools.
The grid scale + offset come bundled in the file, so they're picked up automatically.
Maps you upload belong to you (not to any specific party). When you load a library map into a party in play mode, it brings along the grid / fog / lighting you set up here — unless that party has already played the map and made its own changes, in which case the party's state is preserved.