Satisfactory: Save Inspector
What build wrote this save, what is the session called, is it modded, and will a dedicated server actually load it. Reads the header only, in your browser.
Pick a .sav
Windows: %LOCALAPPDATA%\FactoryGame\Saved\SaveGames, then your account id folder
(or the common folder). A .bak is a rotated copy - rename it to .sav
if you want to inspect that one.
Read locally, header only. Nothing is uploaded.
Want this on a real server? Supercraft hosts Satisfactory →
Why the header is the part that matters
Almost every "my dedicated server will not take my save" problem is decided by three header fields, before any factory data is even read:
- Build version - the game build that wrote the file. A server on an older build will not load a newer save. This is the number to compare first, and it is the one people never check.
- Modded flag and mod metadata - if mods were loaded when the save was written, the server needs the same mods at compatible versions. Otherwise you get a failed load, or a load that quietly drops modded buildings.
- Session name - what the server lists the save as. A blank session name uploads fine and is then almost impossible to identify in the manager.
Sizing the machine that will run it? Satisfactory server hosting with backups taken for you, or read the port checker if the server is up but nobody can connect.
Moving a solo or co-op save to a dedicated server
- Finish the session and quit the game, so the newest save is written and closed.
- Give the session a clear name in-game if it does not have one. It is what you will pick from on the server.
- Check the build version here and confirm your server is on that build or newer. Update the server first if not.
- If the header says modded, install the same mods on the server before uploading.
- Upload the
.savthrough the in-game server manager, then load it from the server's save list. - Keep your local copy until you have loaded in and seen your factory. It is the only backup that is guaranteed to work.
FAQ
It says the header ends early.
The file is truncated, usually from an interrupted copy or a cloud sync that did not finish.
Try the .bak next to it, or a copy from before the sync.
Can it tell me my factory's item counts or power usage?
No. That data is in the compressed chunks this tool deliberately does not open. It answers version, session and compatibility questions only.
Is the play time exact?
It is the play duration the game itself recorded in the header, in seconds, shown as hours and minutes. It counts time in the session, not wall-clock time since you started the world.