6,622 tools, each one opened, scored and signed by a Toolio reviewer

Justi18n

Upload your i18n files and get instant translations.

Checked 4 Oct 2026 Reviewed by Alex Listed since September 2024

Screenshot of Justi18n

At a glance

Starts at Free No paid plan found on the vendor's site, September 2026.
Free tier No
Platforms Web, Chrome Extension
Best for Developers, translators
Not for Proofreaders with formatting needs

3.8 out of 5

Scored by Alex after real use

Our verdict

JustI18n quickly converts text for multiple languages using GPT. Best for teams needing fast, flexible translation solutions. Not ideal if you need professional quality translations or advanced editing features.

✓What it does well

SpeedProvides quick translations from uploaded files.
CompatibilitySupports JSON, Chrome extension message files and Java properties.
OpenAI IntegrationUses your OpenAI API key for translation requests.

✕Where it falls short

Limited QualityMay not produce high-quality translations for all languages or contexts.
No Editing ToolsDoesn't include advanced editing tools like proofreading or formatting options.
Free Plan LimitationsThe free plan has limitations on file types and translation length.

Key features

API Key RequiredNeeds an OpenAI API key to function properly.
Local Run OptionCan run translations locally via browser extension or JSON file upload.
Sample Files IncludedOffers sample [sample.json] for testing purposes.
Openai Api Key IntegrationUses your openai api key for translation requests.

Questions about Justi18n

What does Justi18n do?

Justi18n translates i18n files using GPT. Users upload files such as JSON, Chrome extension message files or Java properties and get quick translations into multiple languages. It runs on the web and as a Chrome extension, and translations can run locally via the browser extension or a JSON file upload.

Does Justi18n need an OpenAI API key?

Yes. Justi18n needs the user's own OpenAI API key to function, and it sends translation requests through that key. A sample.json file is included for testing before translating real files.

Is Justi18n good for professional translation?

Not ideal. The reviewer says Justi18n may not produce high-quality translations for all languages or contexts and lacks advanced editing tools such as proofreading or formatting options. Toolio names developers and translators as its best fit, and proofreaders with formatting needs as a poor one.

How does Toolio rate Justi18n?

Alex scored Justi18n 3.8 out of 5 after real use, on 4 Oct 2026. The verdict sees it as best for teams needing fast, flexible translation, crediting its speed and its support for JSON, Chrome extension message files and Java properties.

What are some alternatives to Justi18n?

Toolio lists Wallesai, Toss to Papago Chrome Extension, LocalizeBot and 海豚翻译 Chrome Extension as alternatives to Justi18n. LocalizeBot simplifies app localization but is basic, while Toss to Papago translates text instantly with a right-click.

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