Tabletop Simulator custom deck setup, the complete guide

Digital playtesting means getting your deck into Tabletop Simulator (TTS) — but the custom deck format has specific rules that aren't obvious the first time. Here's exactly what TTS expects.

The core idea: one sheet, one deck

TTS doesn't take individual card images for a custom deck. Instead, you build one sheet image — a grid of every card face, arranged left-to-right, top-to-bottom — plus one shared back image. TTS slices the sheet into individual cards internally based on the grid dimensions you tell it.

The technical requirements

Setting it up in TTS

1. Upload your sheet image and back image somewhere TTS can reach them (Steam Cloud upload from inside TTS is the simplest option — no external hosting needed).
2. In TTS: Objects → Components → Cards → Custom Deck.
3. Set Face to your sheet image URL, Back to your back image URL.
4. Set Width and Height to your actual grid (e.g. 10 and 7 for the default) — not the pixel dimensions. These are column and row counts.
5. Set Number to how many of the grid cells are real cards (if your deck doesn't perfectly fill the grid, the unused cells are simply ignored).

Decks bigger than one sheet

A 10×7 grid holds 70 cards. If your deck is larger, you need multiple sheets — build each sheet as its own Custom Deck object in TTS, then combine them into one stack by dragging one deck onto another (TTS merges them automatically). Keep track of which sheet used which hidden-slot convention if you're mixing "last cell" and "Back is Hidden" approaches — mixing conventions across sheets in the same deck is the second most common setup mistake after the CMYK issue above.