AetherFlow (Letterbox Mod)

This mod adds a cinematic letterbox effect when sneaking.

104 Downloads

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About this Mod

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🪐 AetherFlow (LetterboxMod)

A Minecraft Fabric mod that adds a cinematic letterbox effect when sneaking.

🧩 Features

Smooth black bars fade in/out when sneaking (Shift).
Bars appear behind the hotbar and other HUD elements.
Ease-in / ease-out animation style.
Minimal performance impact.

📦 Installation

Install Fabric Loader.
Install Fabric API.
Download the latest release of LetterboxMod from Modrinth or the Releases section.
Drop the .jar file into your mods/ folder.
Launch the game!

🖼️ Preview

Preview

⚙️ Configuration

No configuration needed. The mod activates the effect automatically when sneaking.

👤 Credits

Developed by @beltrancruz
Special thanks to FabricMC and the Minecraft modding community.

🪪 License

This project is licensed under the MIT License.

Available Versions

AetherFlow (Letterbox Mod) v1.0.0release

MC 1.21.4fabric

July 25, 2025

How to Install AetherFlow (Letterbox Mod) 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 (1.21.4).

Install Mod

Open the mod browser in the dashboard and search for "AetherFlow (Letterbox Mod)". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.4

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

AetherFlow (Letterbox Mod) 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 (1.21.4). You can switch loaders with one click in the panel.

Is AetherFlow (Letterbox Mod) compatible with fabric?

AetherFlow (Letterbox Mod) officially supports fabric for Minecraft 1.21.4. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with AetherFlow (Letterbox Mod) – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if AetherFlow (Letterbox Mod) 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.