Stuck at 111%? Drop your save file here (user1.dat to user4.dat, one per slot) and the analyzer tells you what counts and what doesn't: charms, bosses, warrior dreams, the Colosseum of Fools' trials, equipment, spells, masks, vessels, the nail, the Dreamers, the Grimm Troupe and the pantheons. And beyond the 112%, every grub, Mask Shard, Vessel Fragment, Pale Ore and charm notch you have left, on the game's map.
The file is on Windows: %USERPROFILE%\AppData\LocalLow\Team Cherry\Hollow Knight; on macOS: ~/Library/Application Support/unity.Team Cherry.Hollow Knight; on Linux: ~/.config/unity3d/Team Cherry/Hollow Knight. With Steam Cloud that folder already holds the synced copy. In Chrome and Edge the site can follow the file: every time the game saves (resting at a bench or quitting), the page catches up on its own.
It's almost always one thing: a fragile charm left with the Divine, a Vessel Fragment, a warrior dream or the last pantheon. The analyzer tells you which.
No. It only reads it: it never writes to the file and never uploads it anywhere.
Consoles don't let you take the file out. You can tick your progress by hand on the 112% checklist.