StepUp

An updated Fabric build of StepUp for Minecraft 1.21.x, covering 1.21 through 1.21.11.

StepUp increases the player's step height so you can walk up blocks smoothly instead of jumping into them. The result feels similar to vanilla auto-jump at first glance, but the movement is more direct and avoids the awkward timing and hunger cost of repeated jumps.

This makes the mod especially useful for everyday traversal, base building, path walking, caves, stairs, uneven terrain, and situations where vanilla auto-jump feels slow or intrusive.

What the mod does

Lets you walk up full blocks more smoothly.
Keeps movement feeling closer to normal walking than to jumping.
Gives you three movement modes that can be switched at any time.
Works entirely on the client, so it can be used in singleplayer and on vanilla-compatible servers.
Saves its mode per server, so you can enable it where it works well and keep different behavior elsewhere.

In practice, the mod changes how movement feels when you approach blocks that would normally require a jump. Instead of repeatedly hopping up terrain, StepUp raises the player's step height and lets the character climb over the block edge in a more continuous way.

Why use it instead of vanilla auto-jump

Vanilla auto-jump can be useful, but many players dislike it because it:

triggers when you do not want it to,
changes movement timing,
makes traversal feel less precise,
adds repeated jump behavior,
and applies the normal hunger penalty of jumping.

StepUp aims to keep the useful part of auto-jump, walking over obstacles, without inheriting those downsides.

Modes

The mod cycles through three modes:

`StepUp`

This is the main feature mode.

The mod raises the player's step height above vanilla.
You can walk over full blocks without jumping.
Movement feels smooth and continuous.
While sneaking, the mod temporarily falls back to normal step height for better control.

`Disabled`

StepUp is turned off.
Vanilla auto-jump is also turned off.
Movement returns to standard non-autojump behavior.

`Vanilla Auto Jump`

StepUp's custom step-height behavior is disabled.
Vanilla auto-jump is turned on through the normal Minecraft option.
This is useful if you want to compare the two behaviors quickly.

Controls

By default, the mode toggle is bound to J.

Press J to switch between StepUp, Disabled, and Vanilla Auto Jump.
The key can be changed in Minecraft's Controls menu like any normal keybind.
When you switch modes, the mod shows a short status message in chat so you can see the active mode immediately.

Configuration

StepUp stores its settings in:

config/stepup.json

The configuration is saved per server. That means:

singleplayer can have one default behavior,
one multiplayer server can use StepUp,
another can stay on Disabled,
and another can stay on Vanilla Auto Jump.

This is useful because some servers may feel better with the feature enabled, while others may have movement rules, plugins, or anti-cheat setups where you prefer to leave it off.

The file keeps:

a default state for new worlds and unknown servers,
and a list of server-specific overrides keyed by server address or singleplayer.

Typical use cases

Walking around bases with slabs, stairs, and small elevation changes.
Exploring hills, caves, and uneven terrain without constant hopping.
Building while moving across partial structures and rough surfaces.
Playing with auto-jump-like convenience without wanting the normal vanilla behavior.
Keeping different movement preferences for different servers.

Requirements

Minecraft Java Edition 1.21 to 1.21.11
Fabric Loader
Fabric API
Java 21

Installation

Install Fabric Loader for your Minecraft version.
Install Fabric API for the same version.
Put the StepUp jar in your mods folder.
Start the game.

Because this mod is client-side, it does not require a server-side installation for normal use.

Compatibility

This fork was updated specifically for the full Minecraft 1.21.x line.

The same jar is intended to run on:

1.21
1.21.1
1.21.2
1.21.3
1.21.4
1.21.5
1.21.6
1.21.7
1.21.8
1.21.9
1.21.10
1.21.11

Internally, this fork includes compatibility work for API differences across the 1.21.x series, especially around client keybinding and step-height handling.

Notes

This mod is designed to work on the client.
It should work with vanilla-compatible servers in normal cases.
Some servers may still interfere with the effect if they change movement behavior or enforce custom restrictions.

Credits

Full credit for the original public StepUp mod release and maintenance goes to Giselbaer.

Original author profile: https://modrinth.com/user/Giselbaer
Original mod page: https://modrinth.com/mod/stepup

This fork exists only to keep the mod usable on newer Fabric 1.21.x versions.

The upstream history of the project also includes earlier StepUp/StepUpNext work reflected in the archived repository and license notices. This fork keeps that lineage intact while updating compatibility for current versions.

License

This fork continues to respect the upstream project's MIT license.