automatic1111 Apr 27, 2026 Updated Oct 28, 2026 2 min read

How to Install the Japanese Extension in Automatic1111 on RunDiffusion

Install the Japanese extension in Automatic1111 on RunDiffusion, restart the app, and switch the interface language to Japanese.

Abstract purple circuitry and a luminous loop

Introduction

Automatic1111 is a powerful interface for working with Stable Diffusion, but not every user wants to work in English.

If you prefer a Japanese interface, you can install the Japanese extension while using Automatic1111 on RunDiffusion and change the display language.

This guide explains how to launch Automatic1111 on RunDiffusion, install the Japanese extension, and switch the interface to Japanese.

Automatic1111 interface with Japanese localization enabled

Launch Automatic1111 on RunDiffusion

First, launch Automatic1111 from RunDiffusion.

Visit RunDiffusion. Log in or create an account.

RunDiffusion homepage

After logging in, you are automatically redirected to the RunDiffusion platform (formerly the Runnit platform).

RunDiffusion platform landing page after login

Click Opensource Applications in the left sidebar.

Left sidebar with Opensource Applications selected in RunDiffusion

Click Automatic1111.

Opensource Applications page with Automatic1111 selected

Select Launch Automatic1111.

If you only want to test installing the extension, you can start with a smaller server. Make sure the build is up to date before continuing.

Launch Automatic1111 panel with server options and current build

Once Automatic1111 opens, continue to the next step.

Install the Japanese extension

Next, install the Japanese extension inside Automatic1111.

Automatic1111 main interface after launch

Click Extensions in the top menu.

Automatic1111 top menu with Extensions selected

Click the Install from URL tab.

Paste the following URL into the field labelled URL for extension's git repository.

https://github.com/L4Ph/stable-diffusion-webui-localization-ja_JP

Click Install.

Install from URL tab with the Japanese localization repository URL entered

Automatic1111 downloads and installs the Japanese localization extension.

When installation finishes, a message like the following appears.

Installed into /opt/rd/apps/stable-diffusion-webui/extensions/stable-diffusion-webui-localization-ja_jp. Use Installed Tab to restart

Installation confirmation for stable-diffusion-webui-localization-ja_jp

Restart Automatic1111 from Server Manager

After installing the extension, restart Automatic1111.

Click Server Manager in the left sidebar.

Left sidebar with Server Manager selected

Click Restart App 'Auto1111'.

Server Manager panel with Restart App Auto1111 button

Automatic1111 restarts and reopens automatically. Reloading allows the new localization options to appear correctly.

Automatic1111 reopening after restart

Switch Automatic1111 to Japanese

Once Automatic1111 has restarted and reopened, switch the interface to Japanese.

Click Settings in the top menu.

Automatic1111 top menu with Settings selected

Scroll down to find the Bilingual Localization tab.

Settings page near the Bilingual Localization section

Click Bilingual Localization once. Scroll up to display the localization dropdown. Select ja_JP from the dropdown.

Localization dropdown with ja_JP selected

Click Apply settings. Click Reload UI.

Apply settings and Reload UI buttons in Automatic1111

Automatic1111 reloads with the interface displayed in Japanese.

Automatic1111 interface reloaded in Japanese

Related RunDiffusion guides

For more information about setting up Automatic1111 and RunDiffusion, see these guides.

Finished

The Automatic1111 interface is now displayed in Japanese. The Japanese setting will also be applied the next time you open Automatic1111.

Completed Automatic1111 interface in Japanese
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