The zero configuration build tool for
  • the web.
  • JavaScript.
  • CSS.
  • HTML.
  • TypeScript.
  • React.
  • images.
  • SASS.
  • SVG.
  • Vue.
  • libraries.
  • Less.
  • CoffeeScript.
  • Node.
  • Stylus.
  • Pug.
  • Electron.
  • Elm.
  • WebGL.
  • extensions.
  • GraphQL.
  • MDX.
  • XML.

Parcel combines a great out-of-the-box development experience with a scalable architecture that can take your project from just getting started to massive production application.

Get started GitHub
Trusted by:

A build tool for the rest of us.

Parcel starts with a great development experience, from starting a new project, to iterating and debugging, and shipping to production. No more fiddling with configuration, or spending hours to keep up with best practices – it just works!

Zero config

Start with an HTML file. Add a <script> tag. Maybe some CSS. How about TypeScript? SASS? Images? No problem. Parcel works out of the box just as you'd expect.

Parcel supports many languages and file types out of the box, from web technologies like HTML, CSS, and JavaScript, to assets like images, fonts, videos, and more. And when you use a file type that isn't included by default, Parcel will automatically install all of the necessary plugins and dev dependencies for you!

Get started →
    <title>My First Parcel App</title>
    <link rel="stylesheet" href="styles.css">
    <h1>Hello, World!</h1>
    <script type="module" src="app.tsx"></script>

Dev server

Parcel includes a development server out of the box. Just run parcel index.html to get started.

Need HTTPS? Run Parcel with the --https flag, and it will automatically generate a certificate for you! Or, if you like, you can provide your own.

Parcel also has a built-in API proxy, which can help simulate your production environment.

Learn more →

Hot reloading

When you make a change, Parcel automatically updates your code in the browser – no page reload necessary!

Parcel also integrates with React Fast Refresh and the Vue Hot Reloading API to automatically preserve your application state between updates. This gives you instant feedback as you make changes, without taking you out of context.

Learn more →


If you make an error in your code or configuration, Parcel displays beautiful diagnostics in your terminal and in the browser.

Every error includes a syntax highlighted code frame pointing to the exact location where the error occurred, along with hints about how to fix the issue.

Many diagnostics even include a documentation link where you can learn more.

$ parcel index.html
Server running at http://localhost:1234
🚨 Build failed.

@parcel/core: Cannot resolve 'ract' from './index.js'
> 1 | import React from 'ract';
>   |                   ^^^^^^
  2 | 
  3 | function Test() {

@parcel/resolver-default: Cannot find module 'ract'
Did you mean 'react'?

Automatic production optimization.

Parcel optimizes your whole app for production automatically. This includes tree-shaking and minifying your JavaScript, CSS, and HTML, resizing and optimizing images, content hashing, automatic code splitting, and much more.

Tree shaking

Parcel supports tree-shaking both ES modules and CommonJS out of the box! It statically analyzes the imports and exports of each module, and removes everything that isn't used.

Tree shaking even works across dynamic import() boundaries, shared bundles, and even across languages! If you use CSS modules, unused classes will be removed automatically.

Learn more →
import {add} from './math';

console.log(add(2, 3));
export function add(a, b) {
  return a + b;
export function square(a) {
  return a * a;


Parcel includes minifiers for JavaScript, CSS, HTML, and SVG out of the box! Just run parcel build index.html, and your whole application will be built and optimized automatically.

Learn more →

Image optimization

Parcel supports resizing, converting, and optimizing images! Just pass query parameters for the format and size you need when referencing the image file in your HTML, CSS, JavaScript, etc. and Parcel will take care of the conversion and optimization process.

You can even request multiple sizes or formats of the same source image for different devices or browsers!

Learn more →
  <source type="image/webp" srcset="image.jpg?as=webp&width=400, image.jpg?as=webp&width=800 2x">
  <source type="image/jpeg" srcset="image.jpg?width=400, image.jpg?width=800 2x">
  <img src="image.jpg?width=400" width="400">


Compress your app before you deploy using Gzip and Brotli.

Learn more →

Code splitting

When multiple parts of your application depend on the same common modules, they are automatically deduplicated into a separate bundle. This allows commonly used dependencies to be loaded in parallel with your application code and cached separately by the browser!

Code splitting is also supported for CSS. If you import CSS from your JavaScript, a sibling CSS bundle will be produced and loaded in parallel with the JS bundle.

Learn more →
Dashboard Profile React Lodash

Content hashing

dashboard.js react.js dashboard.a96cdf.js

Parcel automatically includes content hashes in the names of all output files. This enables long-term browser caching, because the output is guaranteed not to change unless the name does.

Parcel also resolves all referenced bundles relative to their parent using a manifest in each entry. This means that changes to referenced bundles don't invalidate the cache for their parents as well, and output files can be moved between locations without rebuilding.

Learn more →

Scalable from small websites to massive applications.

Parcel requires zero configuration to get started. But as your application grows and your build requirements become more complex, it's possible to extend Parcel in just about every way.

Simple configuration?!

Configuring Parcel is like a breath of fresh air. .parcelrc is a simple JSON-based config format that uses globs to match your source files to build pipelines. You can extend the default config and add plugins to handle custom file types, or override and extend the defaults.

Learn more →


Start with the default config, or a community preset.


Compile individual source files and extract dependencies.


Resolve a dependency to a file path or virtual module.


Determine the name of an output file.


Combine multiple assets together into a single output file.


Minify, optimize, and transform output files.


Compress and encode output files in multiple formats.


Receive events on build progress and completion.

  "extends": ["@parcel/config-default"],
  "transformers": {
    "*.svg": ["@parcel/transformer-svg-react"]
  "resolvers": ["@parcel/resolver-glob", "..."],
  "namers": ["@company/parcel-namer", "..."],
  "packagers": {
    "*.{jpg,png}": "parcel-packager-image-sprite"
  "optimizers": {
    "*.js": ["parcel-optimizer-license-headers"]
  "compressors": {
    "*.js": ["...", "@parcel/compressor-gzip"]
  "reporters": ["...", "parcel-reporter-manifest"]

Powerful plugins

import {Transformer} from '@parcel/plugin';

export default new Transformer({
  async transform({asset}) {
    let source = await asset.getCode();
    let sourceMap = await asset.getMap();

    let {code, map} = compile(source, sourceMap);

    return [asset];

Parcel has a plugin for everything. In fact, Parcel core is completely language agnostic! From transforming files, to resolving dependencies, to bundling and optimizing – everything is customizable.

Each plugin type has a specific, well defined API designed for its purpose. All objects and methods are fully documented, and include TypeScript definitions for autocomplete and type safety.

As you're developing a plugin, it even hot reloads as you save without needing to re-run your build from scratch! This makes it super fast to debug and iterate. It even works with dependencies in node_modules!

Learn more →

Named pipelines

Want to transform the same types of files in multiple ways in a single build? Create a named pipeline, and use it as a URL scheme in your code.

For example, you could inline the compiled contents of a bundle as text, a data URL, an ArrayBuffer, or anything else! Or if you're building a documentation site, you could import both the generated API docs and source code for a file. The possibilities are endless.

Learn more →
  "extends": "@parcel/config-default",
  "transformers": {
    "buffer:*": ["...", "parcel-transformer-buffer"]
import buffer from 'buffer:./logo.png';

Designed for performance

Parcel's plugin system has been designed from the ground up with performance in mind. Plugins are automatically parallelized across multiple threads, and integrated with Parcel's cache. Any dependencies or configs your plugin uses are automatically tracked and invalidate the build.

Learn more →


Integrate Parcel into any existing build system using Parcel's API, which allows you to perform builds programmatically.

Learn more →


All Parcel plugins use a unified diagnostic format that supports highlighted code frames, rich Markdown formatting, hints, and documentation links.

Learn more →

Powered by open source.

Parcel is an open source project, powered by code and financial contributions from companies and individuals around the world.

🥇 Gold sponsors

Gold sponsors donate $1,000 or more per month to Parcel.

🥈 Silver sponsors

Silver sponsors donate $500 or more per month to Parcel.

🥉 Bronze sponsors

Bronze sponsors donate $100 or more per month to Parcel.

💵 Backers

Backers have donated any amount of money to Parcel. Become a backer →

😍 Contributors

Contributors help fix bugs and implement new features in Parcel. Become a contributor →