Direct answer
The checker runs entirely in your browser and does not upload save files or account data. It applies the official Build 41 and 42.19 save boundaries first, then routes current Build 42.20.x mod and multiplayer symptoms to conservative diagnostics.
Do this first
- Select the version that created the save.
- Choose solo, hosted co-op, or dedicated server.
- State whether the world is modded.
- Choose the visible symptom.
- Follow the linked guide and preserve the original world.
Private browser tool
Check your safest next step
No files, Steam account, server address, or personal data are requested.
Recommended path
Start on the current Stable line
- Create a new world on the current Stable line and record the exact version before adding mods.
What the checker can decide
It can identify the correct preservation branch for Build 41 or 42.19, recommend a backup before same-line updates, and choose between save, mod, version-mismatch, joining-game, and server guides.
What it cannot prove
It cannot inspect a save, guarantee a community mod works, or replace current developer warnings. The result is a safe next step based on the answers you provide.
Privacy
Selections remain in the current browser session. The tool requests no file upload, Steam account, server address, or personal information.
FAQ
Quick answers
Does the tool upload my save?
No. It uses simple local form choices and does not request any file.
Can it guarantee a mod is compatible?
No. It can route you through version, dependency, preset, and clean-test checks.
Evidence log
Sources checked
Official sources establish universal facts; forum and specialist sources are used for symptoms, vocabulary, and cross-checking.
OfficialProject Zomboid Build 42.20 ReleasedOfficial Stable status, legacy41 instructions, and the explicit Build 41/42.19 save boundaries.
OfficialFeatures Overview: Build 42.20Official overview of the expanded map, new towns, basements, animals, crafting, occupations, traits, mod manager, and multiplayer UI.