# Supported formats

> Fink edits i18next JSON, next-intl and inlang message format files (Paraglide JS). What each supports, file and push limits, and what isn't supported yet.

Fink reads and writes translation files through inlang format plugins. It ships three of them, pinned to tested versions.

| Format | Used by | Settings key | Notes |
|---|---|---|---|
| **i18next JSON** | i18next, react-i18next, next-i18next | `plugin.inlang.i18next` | Nested or flat keys, namespaces, plural suffixes, context. [Details](/docs/i18next) |
| **next-intl** | next-intl | `plugin.inlang.nextIntl` | `messages/{locale}.json`, nested namespaces, files per namespace, ICU plurals, selects and rich text tags. [Unused messages](/docs/unused-messages) and usage in code. [Details](/docs/next-intl) |
| **inlang message format** | Paraglide JS | `plugin.inlang.messageFormat` | Variables, plurals, selects, exact numbers. [Unused messages](/docs/unused-messages) and usage in code. [Details](/docs/paraglide-js) |

A project must configure exactly one of these. A repository can contain several projects, each with its own format.

## Not supported

If your project uses another format plugin, Fink shows "Unsupported resource plugins" and doesn't open it. This includes:

- ICU MessageFormat files of other libraries (the generic ICU1 plugin), FormatJS / react-intl
- The generic inlang JSON plugin
- gettext PO, XLIFF, YAML, Android XML, iOS `.strings` and `.xcstrings`, ARB

Fink only runs its own bundled plugins. It never loads plugin code from a repository, so it can't add formats on the fly.

## Limits

- Translation files are JSON, at most 1 MiB each.
- One push changes at most 100 files and 5 MiB in total.
- The repository must be on github.com, and GitHub must return its complete file tree. Very large repositories can exceed GitHub's limit.
- Settings must use inlang SDK v3 (`baseLocale` and `locales`).
- Fink needs a current browser with the Origin Private File System, where drafts are stored. It is tested in Chrome. Other current browsers should work but aren't tested.