🪂 Paraglide JS

Compiler-based i18n library that emits tree-shakable translations, leading to up to 70% smaller i18n bundle sizes.

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Quick Start ·
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<sub>Used in production by


   
   
   
   
...and more</sub>

_{Trusted by framework authors}


SvelteKit's official i18n integration

Part of TanStack's CI pipeline

Code Preview

``js
// messages/en.json
{
"greeting": "Hello {name}!"
}
`

`js
import { m } from "./paraglide/messages.js";

m.greeting({ name: "World" }); // "Hello World!" — fully typesafe
`

The compiler generates typed message functions. Your bundler tree-shakes unused messages. Expect up to 70% smaller i18n bundle sizes compared to runtime i18n libraries (e.g. 47 KB vs 205 KB).

Why Paraglide?

| | |
| ------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Smaller i18n Bundle | Up to 70% smaller i18n bundle size than runtime i18n libraries. |
| Tree-Shakable | Unused messages are eliminated by your bundler. |
| Fully Typesafe | Autocomplete for message keys and parameters. Typos become compile errors. |
| Framework Agnostic | Works with React, Vue, Svelte, Solid, TanStack, or vanilla JS/TS. |
| Built-in i18n Routing | URL-based locale detection and localized paths out of the box. |
| Built on inlang | Integrates with Sherlock (VS Code extension), Fink (translation editor), and more. |

Works With Your Stack


React ·
Vue ·
TanStack Start ·
SvelteKit ·
React Router ·
Astro ·
Vanilla JS/TS


> [!TIP]
> Paraglide is ideal for any Vite based app. Setup is just one plugin and Vite's tree-shaking eliminates unused messages automatically. Get started →

Quick Start

`bash
npx @inlang/paraglide-js init
`

The CLI sets up everything:

- Creates your message files
- Configures your bundler (Vite, Webpack, etc.)
- Generates typesafe message functions

Then use your messages:

`js
import { m } from "./paraglide/messages.js";
import { setLocale, getLocale } from "./paraglide/runtime.js";

// Use messages (typesafe, with autocomplete)
m.hello_world();
m.greeting({ name: "Ada" });

// Get/set locale
getLocale(); // "en"
setLocale("de"); // switches to German
`

Full Getting Started Guide →

How It Works

Paraglide compiles an inlang project into tree-shakable message functions. Your bundler eliminates unused messages at build time.

`
┌────────────────┐
│ Inlang Project │
└───────┬────────┘
│
▼
┌────────────────────────┐
│ Paraglide Compiler │
└───────────┬────────────┘
│
▼
┌──────────────────────────┐
│ ./paraglide/messages.js │
│ ./paraglide/runtime.js │
└──────────────────────────┘
`

Watch: How Paraglide JS works in 6 minutes →

Message Format

Paraglide uses Intl.PluralRules for locale-aware pluralization, supporting all CLDR plural categories (zero, one, two, few, many, other) and ordinals (1st, 2nd, 3rd). Gender and custom selects are supported via the variants system.

`js
// Pluralization example
m.items_in_cart({ count: 1 }); // "1 item in cart"
m.items_in_cart({ count: 5 }); // "5 items in cart"

// Works correctly for complex locales (Russian, Arabic, etc.)
``

Message format is plugin-based — use the default inlang format, or switch to i18next, JSON, or ICU MessageFormat via plugins. If your team relies on ICU MessageFormat 1 syntax, use the inlang-icu-messageformat-1 plugin.

Pluralization & Variants Docs →

Comparison

| Feature | Paraglide | i18next | react-intl |
| ---------------------- | ---------------------------------- | --------------------- | --------------------- |
| i18n bundle size | Up to 70% smaller via tree-shaking | ❌ Ships all messages | ❌ Ships all messages |
| Tree-shakable | ✅ | ❌ | ❌ |
| Typesafe | ✅ | Partial | ❌ |
| Framework agnostic | ✅ | Wrappers needed | React only |
| i18n routing | ✅ Built-in | ❌ | ❌ |

Full Comparison →

What Developers Say

> "Paraglide JS is by far the best option when it comes to internationalization. Nothing better on the market."
>
> Ancient-Background17 · Reddit

> "Just tried Paraglide JS. This is how i18n should be done! Totally new level of DX."
>
> Patrik Engborg · @patrikengborg

> "I was messing with various i18n frameworks and must say Paraglide was the smoothest experience. SSG and SSR worked out of the box."
>
> Dalibor Hon · Discord

> "I migrated from i18next. Paraglide reduced my i18n bundle from 40KB to ~2KB."
>
> Daniel · Why I Replaced i18next with Paraglide JS

Talks

- Paraglide JS 1.0 announcement
- Svelte London January 2024 Meetup

Ecosystem

Paraglide is built on the open inlang format. Works with:

| Tool | Description |
| ----------------------------------------------------------------------- | ------------------------------------------------ |
| Sherlock | VS Code extension for inline translation editing |
| CLI | Machine translate from the terminal |
| Fink | Translation editor for non-developers |
| Parrot | Manage translations in Figma |

Explore the inlang ecosystem →

Documentation

- Getting Started
- Framework Guides (React Router, SvelteKit, Astro, etc.)
- Message Syntax & Pluralization
- Routing & SSR
- API Reference

Contributing

We welcome contributions! See CONTRIBUTING.md for guidelines.

- GitHub Issues
- Discord Community

License

MIT — see LICENSE