Terraria + tModLoader — Co-op Save Sync

Your World. Your Builds.
Anyone Can Host.

Hearth syncs your Terraria world files through Google Drive automatically. No more losing access to hundreds of hours of shared builds because the host isn't online. Works with vanilla Terraria and tModLoader.

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Free Forever Vanilla + tModLoader Your Google Drive No Server Required

The Problem

Terraria Has Had This Problem for Over a Decade

The host owns the .wld file. When they're offline, your shared world — every build, every boss defeated, every chest filled — is completely inaccessible.

Host Goes Offline — World Is Gone

Your group has fought through the Wall of Flesh, built elaborate bases, and organized hundreds of chests. Then the host disappears for a week. All of that progress is locked on their machine with no way to continue.

Manual .wld File Transfers Are Error-Prone

Terraria worlds need both the .wld and .wld.bak files. Send the wrong one, load an outdated version, or accidentally overwrite the latest save — and hours of work vanish. There's no version tracking, no safety net.

tModLoader Makes It Even More Complicated

tModLoader stores saves in a completely different location from vanilla Terraria. On top of that, world files are tied to specific mod versions — sending a file without the right mod loadout causes crashes and corruption.

tModLoader Support Built In

Hearth handles both vanilla Terraria and tModLoader saves. It automatically detects which save location your world is in — Documents/My Games/Terraria/Worlds for vanilla, Documents/My Games/Terraria/tModLoader/Worlds for modded — and syncs the right files.

How It Works

Set It Up Once. Everyone Gets the World.

Hearth handles the .wld and .wld.bak files together automatically. No version confusion, no missing files, no wrong saves loaded.

Point Hearth at Your Google Drive Folder

One-time setup. Tell Hearth where your shared HearthSync folder is on your Google Drive. Everyone in your group points to the same folder.

Share Your Terraria World

Check the box next to your world in Hearth. It pushes both the .wld and .wld.bak files to Drive immediately. Your group sees the world on their end within seconds.

Launch Terraria — Hearth Locks and Syncs

When Terraria launches, Hearth locks the shared world and pulls the freshest version from Drive. You're always starting from the latest save, not a stale copy from last week.

Close the Game — Progress Pushed Automatically

When Terraria closes, Hearth pushes the updated .wld file to Drive. The next player pulls it automatically when they open Hearth. Use Host & Play in Terraria to start a session with that world.

What You Get

Built for Groups Who Dig on Their Own Schedule

No server management. No .wld file juggling through Discord. No accidentally loading the wrong version. Just your world, always available.

⛏️

Both Files, Always

Hearth syncs the .wld and .wld.bak pair together. Never a broken world from a missing backup file.

🔧

tModLoader Ready

Automatically detects and syncs tModLoader worlds from the correct save location. Works alongside your mod manager without conflicts.

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World Locking

When Terraria launches, Hearth locks the shared world. No accidental overwrites while someone is mid-session.

📦

Mid-Session Backups

Local backups every 25 minutes while you play. Never lose more than 25 minutes of building, farming, or boss prep.

☁️

Your Drive, Your Data

Saves go to your own Google Drive. No third-party servers, no subscription, no account with us required.

🆓

Free Forever

No trial. No premium tier. Free because Terraria has enough to grind for without paying for access to your own world.

FAQ

What Terraria Players Actually Search For

With Hearth, you check the share box next to your world and it pushes both the .wld and .wld.bak files to your shared Google Drive folder automatically. Your friends open Hearth and the world appears on their end. They can then load it using Host & Play in Terraria's multiplayer menu.

Vanilla Terraria saves worlds to Documents\My Games\Terraria\Worlds. Each world has a .wld and a .wld.bak file — you need both. tModLoader saves to Documents\My Games\Terraria\tModLoader\Worlds separately. Hearth detects the right location automatically.

Yes. Hearth supports tModLoader worlds alongside vanilla Terraria. It detects both save locations and syncs whichever world you share. Your group still needs to have the same mods installed — Hearth syncs the world file, not the mod loadout itself. Everyone should be running the same mods through tModLoader's mod browser before launching.

Yes — that's exactly what Hearth is for. Hearth syncs your world file to a shared Google Drive folder so any player in your group can pull the latest save and host it themselves using Terraria's built-in Host & Play option. Nobody is locked out when the original host isn't around.

Yes — Terraria requires both files for a world to load correctly. Missing the .wld.bak can cause the game to throw errors or roll back progress. Hearth syncs both files together automatically so nothing ever gets left behind.

Hearth is completely free. All you need is a shared Google Drive folder — free up to 15GB, which is far more than any Terraria world will ever use. No subscription, no premium tier, no account with us required.

Your World. Your Builds.Anyone Can Host.