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okay, let's dive deep into adding custom fonts to your react native android and ios applications. this guide will be thorough, covering the necessary steps, common pitfalls, and best practices.

**understanding the basics**

react native doesn't automatically include your custom fonts. you need to bundle them with your application and then link them correctly so your app can find and use them. the process is largely the same for both android and ios, with a few platform-specific nuances.

**step 1: acquire your font files**

* **font format:** react native primarily uses `.ttf` (truetype font) and `.otf` (opentype font) formats. ensure you have these files for the font family and weights you want to use (e.g., regular, bold, italic, bold italic).

* **licensing:** double-check the licensing of your fonts. some fonts are free to use, while others require a commercial license. respect the font creator's terms. open source fonts are usually a safe bet.

* **font hosting:** you *can* technically load fonts from remote urls, but it's *strongly* discouraged for performance reasons. loading fonts over the network can significantly delay your app's initial render and lead to a poor user experience. always bundle your fonts within your app.

**step 2: create an `assets/fonts` directory**

1. in the root of your react native project (where your `package.json` file is located), create a folder named `assets`.
2. inside the `assets` folder, create a folder named `fonts`.
3. copy your `.ttf` or `.otf` font files into the `assets/fonts` folder. it's generally a good practice to use descriptive filenames that indicate the font name and weight (e.g., `opensans-regular.ttf`, `opensans-bold.ttf`, `lato-italic.otf`).



**step 3: configure `react-native.config.js` (recommended)**

using a `react-native.config.js` file (or configuring it in your `package.json`) helps react native's cli find your fonts and link them to your native projects. this is the *recommend ...

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