Share Scrap Mechanic worlds with friends, with no dedicated server and no sending save files to each other. Survival, Creative and Custom games all work.
A small Windows tool that keeps your world in online storage and passes it between players like a library book. One player checks the world out, the game opens straight into it, and when they quit the tool uploads their progress for the next player.
- Two copies never go out of sync. Only the player who has the world can play and upload.
- Play together too. If a friend already has the world, one key joins their game.
- Mods are checked. A world made with Workshop mods tells each friend which ones to subscribe to before they can play it.
- Backups at every step. The last 5 uploads and the last 10 local copies can be restored.
- Nothing to install. One PowerShell script with a text menu. It updates itself.
You need Windows 10 or 11 and Scrap Mechanic on Steam. One person in the group, the host, also needs a Cloudflare account for the storage. Cloudflare asks for a payment card when its storage is switched on, but a shared world stays far inside the free allowance.
- Download Scrap-Mechanic-Sync.zip, right-click it and choose Extract All.
- Open the folder and double-click Scrap Mechanic Sync.
- Choose your route on the welcome screen:
- Starting a shared world: press 2. The tool walks you through creating the storage, uploads your world and gives you an invite to send. About 10 minutes.
- Joining a friend's world: copy the invite message they sent you and press 1.
- From then on, start the game from the tool. Press 1 to play and quit the game when you are done. The tool does the rest.
An invite code is the key to your world, so send it privately.
| Setup guide | Every setup step for hosts and friends, and what to do when the connection test fails |
| Everyday use | The menu, playing at the same time, mods, backups and troubleshooting |
| Safety and privacy | What the tool does on your PC, automatic updates, and what a report contains |
| Development notes | Storage layout, tests and releases |
Found a fault? Press I in the tool's menu, or open an issue. Never post an invite code or your settings file.
Scrap Mechanic Sync is an unofficial, fan-made tool. It is not affiliated with, endorsed by or supported by Axolot Games, the developer and publisher of Scrap Mechanic. Scrap Mechanic is a trademark of its owner. Use the tool at your own risk and keep your own backups of worlds you care about.
If this saved you some hassle, you can buy me a coffee.