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What is the download size of React?

Deepak Tewatia
August 16, 2025
• 2 min read
What is the download size of React?

When you're diving into the world of web development, one of the first questions that might pop into your mind is, "How much will this library weigh me down?" In the case of React, the answer is quite reassuring. The core library is relatively lightweight, making it a solid choice for developers aiming to build dynamic web applications without unnecessary bloat.

Breaking Down the Size

Let’s break it down. The minified version of React clocks in at around 30KB. On top of that, if you're also using ReactDOM, you can expect to add another 30KB to your project. So, when you account for both React and ReactDOM, the total comes to about 60KB. That’s not too shabby!

Why Size Matters

Understanding the size of React is crucial for a few reasons:

  • Performance: Smaller files often lead to faster load times, which is essential for user experience.
  • Optimization: Knowing the size helps you make informed decisions about code-splitting and optimizing your application for performance.
  • Dependencies: By keeping an eye on library sizes, you can better manage your project's overall footprint.

Real-World Impact

Here’s the thing: when you’re building a web application, every kilobyte counts. The smaller your JavaScript bundle, the quicker your app can load and run in users' browsers. This is especially important for mobile users or those on a slow network. React's lightweight nature allows developers to create powerful applications without the overhead that can slow things down.

Getting Started with React

If you’re ready to start using React, it’s worth checking out the official documentation. You’ll find everything you need to get going, including installation guides and best practices. Remember, a well-optimized application not only improves performance but also enhances user satisfaction.

Conclusion

In summary, React remains a performant choice for building web applications, with a total download size of about 60KB when incorporating React and ReactDOM. Keeping track of these sizes can help you optimize your projects effectively. So go ahead, explore React, and build something great!