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Visual Data Size project artwork

Modrinth · Minecraft mod

Visual Data Size

A client-side fabric mod that displays the exact byte-size and nested tag count of items in advanced tooltips.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which Visual Data Size release should I use?

Updated today
Latest stable file 1.3.2
Game version 26.3
Loader Fabric

Visual Data Size 1.3.2 targets 26.3 with Fabric. It must be installed on the client. Do not install it on the dedicated server. 1 required mod needs a matching file.

Where it goes

Is Visual Data Size required on the client, server, or both?

It must be installed on the client. Do not install it on the dedicated server.

Client Required
Dedicated server Not supported
Loader for this release Fabric
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

This file is marked client-only.

Understand client and server requirements Read the Minecraft installation guide

What else does Visual Data Size 1.3.2 need?

1.3.2. Change the file and its required mods may change too.

1 required mod needs a matching file

Install Fabric API first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match. 2 come through another mod in the chain.

2 listed on this file 2 pulled in by those mods
Mod Menu Optional for Visual Data Size 1.3.2
optional
Matching file found Matched file: 21.0.0
Fabric API Needed by Visual Data Size 1.3.2
required
No matching file Version asked for: 0.154.2+26.2
Fabric API Needed by Mod Menu
pulled in
Matching file found Matched file: 0.166.2+26.3

2 extra mods were pulled in by other dependencies. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.

Before you install it

Add Visual Data Size without breaking your instance.

Built for Visual Data Size 1.3.2. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use 1.3.2. It targets 26.3 with Fabric; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    Install Fabric API first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match. 2 come through another mod in the chain.

  3. 03

    Put it on the correct side

    It must be installed on the client. Do not install it on the dedicated server.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside 1.3.2. It opens that exact file at the source.

About this project

What does Visual Data Size add?

Visual Data Size

Visual Data Size is a lightweight, purely client-side diagnostic tool for Minecraft 26.3. It makes the serialized data size and internal structure of items visible directly in your inventory tooltips.

Whether you are a mod developer checking item data, a server administrator investigating large item structures, or simply interested in the technical side of Minecraft, Visual Data Size gives you a quick way to inspect item data at a glance.

Key Features

  • Exact Data Measurement: Measures the serialized data size of the current item or full stack in Bytes (B), Kibibytes (KiB), or Mebibytes (MiB).
  • Structural Tag Counter: Counts tags and nested data stored inside an item, including complex items such as filled Shulker Boxes, books, and modded items with custom data.
  • Container Support: Nested item data is included in the measurement, making it useful for inspecting items such as Shulker Boxes and other container items.
  • Custom Item Support: Persistent data from modded items and custom data components is included when it is part of the item's serialized data.
  • Live In-Game Commands: Toggle the display and change the size format directly from chat using simple client-side commands with Tab completion.
  • No Cache: The current ItemStack is measured again when needed, so changes to the item's data are reflected immediately.
  • 100% Client-Side: Runs entirely on your client. No server-side installation or admin permissions are required.
  • Vanilla-Style Tooltip: The additional information uses the same simple dark-gray style as Minecraft's advanced tooltip data.

How to Use

  1. Place the generated .jar file into your Fabric mods folder.
  2. Start Minecraft 26.3.
  3. Join a multiplayer server or open a singleplayer world.
  4. Press F3 + H to enable Minecraft's Advanced Tooltips.
  5. Hover over an item to see its serialized data size and tag count at the bottom of the tooltip.

Chat Commands

Use /visualdatasize to configure the mod. All commands support Tab completion.

  • /visualdatasize toggle — Turns the tooltip display ON or OFF.
  • /visualdatasize format smart — Automatically chooses a readable size unit.
  • /visualdatasize format bytes — Shows the exact size in Bytes.
  • /visualdatasize format kib — Shows the size in KiB.
  • /visualdatasize format mib — Shows the size in MiB.
  • /visualdatasize format bits — Shows the size in Bits.

Example Tooltip Output

The exact value depends on the item and its serialized data.

Size: 42 B (Tags: 3)

Project description from Modrinth.

Pick your setup

Visual Data Size by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

2 available setups

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

Visual Data Size versions and loaders

3 of 3 releases match

Looking for an older file? The official Modrinth project page is in Resources.

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