Next.js localization
for modern app routes and pages

Manage locale JSON files, auto-translate content,
and sync with your Next.js app via CLI.

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SimpleLocalize - Next.js translation editor
Next.js App RouterPages Routernext-intlnext-i18nextnext-translateJSON localesSSR & SSGCLI & REST APIDeepL · Google Translate · OpenAITranslation hosting CDNCI/CD syncTeam translation editorNext.js App RouterPages Routernext-intlnext-i18nextnext-translateJSON localesSSR & SSGCLI & REST APIDeepL · Google Translate · OpenAITranslation hosting CDNCI/CD syncTeam translation editor

We power your product localization
From first commit to global launch

Used at IntersportUsed at IKEAUsed at InvisalignUsed at AmdocsUsed at OSRAMUsed at project44Used at nglUsed at IQAirUsed at walcuUsed at UNICEFUsed at AstraZenecaUsed at nabooUsed at SagemathUsed at Brite

Why Next.js teams
use SimpleLocalize

Next.js projects often mix route-level rendering, shared UI components, and locale-aware data loading. As the app grows, translation files turn into a part of the deployment process, not just static content in a folder. Teams need a reliable way to update messages without losing track of namespaces, locales, and release timing.

SimpleLocalize works with the libraries Next.js teams already use, including next-intl, next-i18next, and next-translate. Push JSON files with the CLI, review text in the online editor, and pull finished translations back into the app for the next build.

Next.js localization workflow

Built for the Next.js localization workflow

From locale files to production deploys, SimpleLocalize fits the delivery model used by modern Next.js teams.

Native JSON support

Upload and download locale JSON files while keeping namespaces, nested keys, and the file structure your app already uses.

CLI pipeline

Use the SimpleLocalize CLI to push source files, auto-translate missing messages, and pull translated files into your repository.

AI auto-translation

Translate new messages with DeepL, Google Translate, OpenAI, and other models. Bring your own API keys when you need full cost control.

Works with major Next.js i18n libraries

Use SimpleLocalize with next-intl, next-i18next, next-translate, or any custom JSON-based localization setup.

Release-ready translations

Keep locale files current for preview builds, staging environments, and production deploys without manual file juggling.

Build-time or runtime delivery

Download translations into the app during build time or serve them through Translation Hosting when runtime updates make more sense.

How it works

From locale files to production in 3 steps

A CLI-first flow that keeps Next.js translations aligned with every release.

1

Upload source locales

Run simplelocalize upload to push the source JSON files used by your Next.js i18n library.

2

Translate and review

Auto-translate missing text with DeepL or OpenAI, then review translations in the online editor with your team.

3

Download and deploy

Run simplelocalize download to pull translated files into the app before the next preview or production build.

For a step-by-step walkthrough, see the getting started guide.

Ready to simplify Next.js localization?

Start a free project and upload your first locale file in minutes.

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CLI pipeline

From source locales to deployment
in two commands

Push your source locale files, translate in the cloud, and pull updated JSON files back into the Next.js app.

Terminal
# Upload source locale JSON $ simplelocalize upload --uploadFormat single-language-json --uploadLanguageKey en --uploadPath ./messages/en/common.json ✓ Uploaded 112 messages from common.json # Auto-translate missing messages $ simplelocalize auto-translate ✓ Translated 112 messages into 8 languages # Download translated locale files $ simplelocalize download --downloadFormat single-language-json --downloadPath ./messages/{lang}/{ns}.json ✓ Downloaded 8 locale sets

Add these commands to CI/CD for automated localization in each build. Read more about the i18n online editor and visit all developer tools.

One project
for Next.js, React, and Vue

Building several web frontends? Manage translations in one SimpleLocalize project and export the right format for each framework.

Next.js (JSON)

Manage locale JSON files for next-intl, next-i18next, and next-translate in one place.

React (JSON)

Export JSON files for react-i18next, FormatJS, and other React i18n libraries.

Vue (JSON/YAML)

Manage locale files for vue-i18n and keep keys aligned across Vue apps.

One project for Next.js, React, and Vue

Why SimpleLocalize

Built for Next.js developers

Practical tooling that matches Next.js release and localization workflows.

JSON locales
Work with the JSON locale structure used by next-intl, next-i18next, next-translate, and custom setups.
CLI-first
Upload and download translation files from scripts, CI/CD jobs, and deployment pipelines.
Multi-framework
Use one project for Next.js, React, Vue, mobile apps, and backend services.
AI translation
DeepL, Google Translate, OpenAI, and other models are available in one place.
Flexible delivery
Bundle translations at build time or serve them at runtime through Translation Hosting.
Flat pricing
Predictable key-based pricing with no hidden fees.
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Start localizing your Next.js app today

  • All-in-one localization platform
  • Web-based translation editor for your team
  • Auto-translation, QA-checks, AI and more
  • See how easily you can start localizing your product.
  • Powerful API, hosting, integrations and developer tools
  • Unmatched customer support
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and support
are fantastic."
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"The support is
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thank you Jakub!"
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"Interface that
makes any dev
feel at home!"
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saves my time
and money"
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Frequently asked questions

How does SimpleLocalize handle Next.js translation files?

SimpleLocalize supports the JSON locale files commonly used in Next.js projects. Upload source files through CLI or API, manage translations in the online editor, and download files back in the same format your app already uses.

Does this work with next-intl, next-i18next, and next-translate?

Yes. SimpleLocalize works with next-intl, next-i18next, and next-translate, as well as custom JSON-based setups. You keep your library choice and manage the translation files in one place.

Can I use this with the App Router and Pages Router?

Yes. The localization workflow is compatible with both routing models because it operates on the translation files your app loads, not on a specific router implementation.

How does this fit into Next.js CI/CD pipelines?

Add simplelocalize upload and simplelocalize download commands to your build or deployment pipeline. Source locale files are pushed and translated files are pulled back automatically before deploys.

Should I bundle translations or load them at runtime?

Both approaches work. Many teams bundle translations at build time, while others use Translation Hosting to update copy without a new deploy. SimpleLocalize supports both models.