ModsFinder

Blocks Previewer

by tricube

Blocks Previewer shows a translucent preview of a block before it is placed, so the orientation of stairs, pistons and other directional blocks can be checked first.

FabricForgeNeoForgeClient-side onlyMIT LicenseOpen source1.20.1 – 26.1.2

What it does

Holding the H key shows the preview for as long as the key stays pressed, while the G key toggles it on and off. The J key switches between preview modes, and all three keys can be rebound in the controls menu. Only directional blocks such as stairs, pistons and observers receive a preview, which helps avoid placing one facing the wrong way and breaking it again.

The mod is client-side only, so the server and other players do not need it and it does not change how the world works for anyone else. Its settings are opened from the Mod Menu screen on Fabric and NeoForge, or from the config menu on Forge, and the command blockspreviewer also opens them. Mod Menu is optional, and the mod depends on Craft Config Lib and Fabric API on Fabric.

The source code and issue tracker are public, and the code is released under the MIT License. Files are published for Fabric, Forge and NeoForge across 20 release versions, 1.20.1 – 26.1.2, and the latest builds are 2.1.1+26.1-neoforge for 26.1.2 on NeoForge and 1.0.0 for 1.20.1 on Forge.

Key features

  1. Preview while holding a key

    Hold H to show the placement preview only while the key stays pressed.

  2. Toggle preview

    Press G to keep the preview on or off without holding a key.

  3. Switch preview modes

    The J key moves between preview modes, so the display can be changed without opening a menu.

  4. Directional block filter

    Only blocks with a facing or orientation, such as stairs, pistons and observers, get a preview.

  5. Configurable controls

    All three keys can be rebound in the controls menu, and settings are reached through the config screen.

Compatibility

Latest build for each game version and loader.

26.x3 of 3 versions with builds
26.1.22.1.1+26.1-fabricNot available2.1.1+26.1-neoforge
26.1.12.1.1+26.1-fabricNot available2.1.1+26.1-neoforge
26.12.1.1+26.1-fabricNot available2.1.1+26.1-neoforge
1.21.x11 of 11 versions with builds
1.21.112.1.1+1.21.11-fabricNot available2.1.1+1.21.11-neoforge
1.21.101.1.1Not availableNot available
1.21.81.0.0Not availableNot available
1.21.71.0.0Not availableNot available
1.21.61.0.0Not availableNot available
1.21.51.0.0Not availableNot available
1.21.41.0.0Not available1.0.0
1.21.31.0.0Not availableNot available
1.21.21.0.0Not availableNot available
1.21.12.1.1+1.21.1-fabricNot available2.1.1+1.21.1-neoforge
1.211.1.1Not available1.0.0
1.20.x6 of 6 versions with builds
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 2

Craft Config LibA client-side configuration library that supports presets and built-in keybinds.
Required
Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

Use cases

Who it’s for: Builders and redstone players in single-player or on multiplayer servers, since only the client needs the mod and the server can run without it.

Questions

Does Blocks Previewer need Fabric API on every loader?

No. Craft Config Lib is required on all loaders, and Fabric API is required only on Fabric, so Forge and NeoForge installs need Craft Config Lib alone.

Does the server need Blocks Previewer installed?

No. Servers do not need it; each player installs it for their own game.

Which keys control the preview?

Hold H for a momentary preview, press G to toggle it, and press J to switch modes. All three keys can be changed in the controls menu.

In the catalog

Blocks Previewer is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 15,189 mods support Minecraft 26.1.2.

Game mechanics mods29,952Fabric modsMods for 26.1.215,189

More from tricube

All projects
Craft Config Lib1.20.1 – 26.3Better Tab Info1.20 – 26.3Optimized Fullbright1.20 – 26.3Hologram API1.20.1 – 26.1.2Holo Damage Indicator1.20.1 – 26.1.2Better Multiplayer Sleep1.19 – 26.3

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What the author says

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…
tricube, on the Modrinth page

Official listing

Owner
tricube
Published
2026-01-09
Updated on Modrinth
2026-05-31
Facts verified
2026-10-15

Tags

Game mechanicsUtilityDecoration
Open on ModrinthCompare