TRY AT YOUR OWN RISK  
Tested on Windows 11  

LoRA Merger – Quick Guide

This tool blends two LoRA .safetensors files into one.

Primary = base LoRA  
Secondary = LoRA blended to the right of Primary  
The slider controls how much Secondary is mixed in.

Only merge LoRAs from the same model family:
Z-Image + Z-Image  
Flux + Flux  
SDXL + SDXL  
Do NOT mix families.

If you mix families anyway:
Example: Primary = Flux, Secondary = Z-Image  
The output will still be a Flux LoRA because Primary is the base.  
Most tensors will not match, so the merge will behave like Primary-only  
and any blended result will be unreliable or broken.

How to use:
1) Run run_lora_merge.bat wait until it fully download it may kind pause at the end once done it should open your browser.
2) Pick your Primary LoRA  
3) Pick your Secondary LoRA  
4) Set Secondary Strength  
5) Click Merge  
6) A new merged LoRA is saved in the tool folder (or merge-files if configured)

Swap button:
Swaps Primary and Secondary without re-selecting files.

Re-merge:
Change the slider and click Merge again to generate a new merged LoRA.

Pro tip (same-LoRA stabilization):
If you trained a LoRA (for example a woman LoRA) and it is close but not perfect,
and you also have another LoRA from the SAME training set or same subject,
you can merge them together.
This can reduce training noise, fix small mistakes, and help give
more consistent results when you generate images.

pro tip Example from above
woman_v1.safetensors + woman_v2.safetensors

Example (finding a sweet spot):
If you trained a character LoRA like:
women.safetensors
and you also trained a specific object LoRA like:
hammer.safetensors
you can merge them to get a combined LoRA (character + object).

Use this to FIND A SWEET SPOT:
Start low (ex: 0.10 to 0.40 strength), test, then adjust.
Do NOT blast the slider all the way up unless you want Secondary to dominate.

Too much strength can cause bad results (overpowering, artifacts, weird bleeding).

It works from one character to another, or from a character to an object (like a hammer).

You can merge a character LoRA with an object LoRA, or merge two character LoRAs together.
They do NOT have to be the same.

Just keep in mind that when you do this, you are BLENDING them.

You will NOT have:
the original woman
or
the original hammer

Instead, you will get:
a single combined LoRA that mixes elements of both.

This means the final result is a fusion,
not two separate originals.

You can also merge two different character LoRAs (like two different women) to blend faces, styles, or identities into something new.


Cleanup note:
Merged files can pile up fast.  
If your merge-files folder gets large, delete old merges you don’t need.
