Blocks Previewer
Client-side mod to preview how blocks will be orientated when placed!
Screenshots
About this Mod
Blocks Previewer
Preview blocks before placing!
Ever placed a stair or piston the wrong way and had to break it again? Blocks Previewer lets you see how a block will be oriented before it’s placed, saving your time and frustration, especially useful for builders and redstoners.
This is a purely client-sided mod, and does not interact the server. Works similarly to Create’s placement preview, but for any block in Minecraft.
To open config for the mod, use the command /blockspreviewer or by using Mod Menu for Fabric or the built in (neo)Forge config menu.
Features
Controls
- Press G to toggle preview
- Hold H for a momentary preview
(Both keys are fully configurable in the controls menu.)
Block filtering
- Use J to switch between previewing:
- All blocks
- Only directional blocks (stairs, pistons, observers, etc.)
- Use J to switch between previewing:
Showcase
TRANSPARENT mode
OUTLINE mode
CONFIGS
Dependencies (For versions >= 2.1.0)
Fabric Dependencies
Mod Menu is optional. All else is required.
| Modrinth | Curseforge |
|---|---|
| Craft Config Lib | Craft Config Lib |
| Fabric API | Fabric API |
| Mod Menu | Mod Menu |
Available Versions
How to Install Blocks Previewer on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (26.1.2).
Install Mod
Open the mod browser in the dashboard and search for "Blocks Previewer". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
26.1.2, 26.1.1, 26.1 (+17 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Blocks Previewer server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (26.1.2). You can switch loaders with one click in the panel.
Is Blocks Previewer compatible with fabric and forge and neoforge?
Blocks Previewer officially supports fabric, forge, neoforge for Minecraft 26.1.2, 26.1.1, 26.1. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Blocks Previewer – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Blocks Previewer consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Blocks Previewer with just one click on your server.