What is LocalePack?
LocalePack is a web tool for localizing Chrome extensions. You upload your source messages.json file, choose target languages from a list of 52 locales, see a price estimate based on file size, and pay once via Stripe. After payment the tool runs AI translations in parallel and generates a ZIP with the correct _locales/{lang}/messages.json folder structure.
The service is built specifically for the Chrome locale format. It keeps $PLACEHOLDER$ syntax and placeholder definitions intact, and it reads description fields as context hints for the translation model. The site also documents Chrome-specific i18n rules, such as underscore locale codes (pt_BR, zh_CN), the required default_locale in manifest.json, and the synchronous behavior of chrome.i18n.getMessage().
Key features
- Parsing and validation of Chrome messages.json files
- AI translation into 52 locales with parallel processing
- Placeholder preservation for $PLACEHOLDER$ syntax
- Use of description fields as translation context
- Export of a ZIP with _locales/{lang}/messages.json structure
- Price estimate based on file size and selected languages
Who is it for
- Chrome extension developers
- Indie developers publishing extensions internationally
- Teams preparing Chrome Web Store listings in multiple languages
Pros and cons
- Built specifically for the Chrome messages.json format
- Placeholders stay intact across all languages
- Pay-once pricing with no subscription
- Uploaded files are limited to 500KB and only Chrome format is accepted
- Translations are generated only after payment
LocalePack pricing
The vendor does not publish prices in a readable form (often pricing is shown only after signing in).
Is LocalePack free?
No - according to the vendor, it is paid only.
LocalePack alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Sider | not listed | yes | Browser extensions |
 MaxAI | 12 USD/mo | yes | Browser extensions |
 Opera AI | not listed | yes | Browser extensions |
 Gemini in Chrome | 97,99 PLN/mo | ? | Browser extensions |
 RegexAI | not listed | yes | Browser extensions |
 AIPRM | not listed | yes | Browser extensions |
All alternatives to LocalePack →
FAQ
What is LocalePack used for?
Translates Chrome extension messages.json files into 52 locales with placeholder-safe AI and returns a ready-to-ship _locales ZIP.
Is LocalePack free?
No - according to the vendor, it is paid only.
How much does LocalePack cost?
The vendor does not publish prices publicly or requires sign-in.
What are the best LocalePack alternatives?
Closest alternatives: Sider, MaxAI, Opera AI, Gemini in Chrome, RegexAI.
Data checked October 12, 2026 on the vendor website (localepack.app).