JustI18n

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Tagline:GPT Driven i18n, make your products available to the world

Updated:October 22, 2026

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AI Translation Learning & Translation Coding & Development AI Developer Tools Office & Productivity Web App Multi-language For Developers Privacy-Focused One-time Purchase API Available Free Zero Setup

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What is JustI18n?

JustI18n is a static web app that uses ChatGPT to localize software resource files for global distribution. It supports JSON key-value files, Chrome extension message files, and Java properties bundles. Requests run directly from the browser to OpenAI using your own API key with no backend server collecting data.

How to use JustI18n?

1. Enter your OpenAI API key in the web application. 2. Drag and drop your i18n resource file (JSON, Chrome extension messages, or Java properties) into the workspace. 3. Run automatic translations, inspect UI length compatibility, or regenerate individual items. 4. Download the translated resource bundle files to your local machine.

JustI18n Core Features

Fast AI-Powered Localization

Translates software resource files across unlimited languages with fast responses powered directly by OpenAI API.

Local Browser Execution and Privacy

Runs entirely in the browser as a static web application where API keys and resource files are kept in local storage with no intermediary backend server.

Multiple Resource Formats Supported

Supports JSON key-value files, Chrome extension locale message files, and Java properties resource bundles.

Length Compatibility and Item Regeneration

Includes length compatibility checks to fit UI layouts and allows selective regeneration of any individual translation entry.

Bring Your Own OpenAI API Key

Connects directly using your personal OpenAI API key, paying only the actual OpenAI token costs without platform markups.

JustI18n Use Cases

Software developers localizing JSON or Java properties files for global releases

Chrome extension developers translating locale message files into multiple languages

Indie hackers translating product landing pages and applications with their own OpenAI API key

JustI18n Frequently Asked Questions

Is this app free?

JustI18n is free to use with basic features. You need a working OpenAI API key to use the app and pay OpenAI directly for token usage. Premium features can be unlocked with a one-time purchase.

How does this app work?

This is a static web app with no backend server. When you enter your API key, it is stored locally in your browser. All requests are sent directly from your browser to OpenAI via HTTPS.

What file formats are supported?

JustI18n supports key-value JSON files, Chrome extension message files, and Java properties resource bundles.

How many devices can I use the License Key on?

Each license key can be used on up to 5 devices, which is typically sufficient for one user. You can manage and unlink devices online via the License Manager if needed.

Can I get a refund?

Yes, a 14-day money-back guarantee is offered. If you are not satisfied, you can contact support within 14 days for a full refund.

JustI18n Product Background & Official Links

JustI18n Support Email & Customer service contact & Refund contact etc.

JustI18n Support Email: feedback@justi18n.com

More Contact, visit the about us page(https://justi18n.com/faqs)

JustI18n Pricing

JustI18n Pricing Link: https://justi18n.lemonsqueezy.com/checkout/buy/126047e5-5318-4ae3-9595-41ead9b8e0a8

JustI18n Twitter

JustI18n Twitter Link: https://twitter.com/aiyanbo

JustI18n Pricing & Plans

Free

Basic i18n translation capabilities
Bring your own OpenAI API key
Runs locally in browser with secure local storage

Subscribe & upgrade now

Lifetime License

flat

$19 one-time

Unlock all premium features
Unlimited languages
Download translated resource bundles
Valid on up to 5 devices
All future updates included
14-day money-back guarantee