No-Code Tool to Generate Optimized Bootstrap 5 JS Bundles

Reduce your Bootstrap 5 Javascript size by up to 90% with tree-shaken JavaScript. No build step required. Select only the components you need and download a minified bundle instantly.

How to Use 🚀

  1. Select your Bootstrap version

    Default is 5.3.8. Adjust the minor version as needed.

  2. Choose output format

    .js for development, .gz/.br for production, or .zip to get all.

  3. Pick components

    Check only what your project uses (Modal, Alert, Carousel...).

  4. Toggle Popper if needed

    Appears automatically when selecting Dropdown, Tooltip or Popover.

  5. Click "Build & Download"

    The magic happens in your browser. When done, your bundle downloads automatically; you can also click "Copy JS" to paste inline.

👋 Found this useful? Link back to this page.

Custom Bootstrap 5 JS Builder

Select components:

Powered by

Bootstrap Rollup Terser JSZip Pako Brotli-Wasm

© 2026 Tilellit.PRO. Licensed under MIT License.

What it does

I searched for something similar to Bootstap 3 Customizer and I was never able to find one.

Tree-shaking at runtime

Fetches Bootstrap source modules from CDN and bundles only your selected components.

Multiple output formats

Download as standard JS, Gzip, Brotli, or a ZIP with all formats included.

Production-ready compression

Minified with Terser (3 passes, aggressive dead-code elimination).

Extreme Minification

Terser with passes: 3, toplevel and dead_code optimization

Popper.js optional

Include Popper inside the bundle for Dropdown, Tooltip & Popover — or skip it to save bytes.

Why use it?

Perfect for self-hosting, software developers, landing pages, prototypes, and performance-critical projects.

🪶
Reduce bundle size by 60-90%

Load only Modal+Alert? Get 8KB instead of 79KB bootstrap.bundle.min.js.

⚡
Faster page loads

Smaller JS = faster parse/execute = better Core Web Vitals (LCP, TTI).

🔒
No build step required

Runs 100% in-browser. No Node, Webpack, or Vite needed.

🌐
CDN-powered, zero backend

Fetches source from jsDelivr.

🧩
Flexible outputs

Get .js for dev, .gz/.br for production, or .zip to cover all bases.

👉
PopperJS on-demand

Include Popper only if you need — skip it to save ~20KB.

Who Is This For?

Built for anyone who wants Bootstrap's power without the bloat. Whether you're optimizing performance or prototyping fast, this tool fits your workflow.

🚀 Frontend Developers

"I need Bootstrap JS but don't want the whole library."

  • Building marketing sites, landing pages, or admin dashboards
  • Want to optimize performance without complex bundler config
  • Prefer quick iteration over build-tool overhead

🎨 Designers & No-Code Builders

"I use Bootstrap in Webflow/Framer and need lightweight JS."

  • Export custom JS to embed in visual builders
  • Avoid bloating projects with unused components
  • Test interactions before handing off to devs

🌍 Agencies & Freelancers

"I ship many small client sites fast."

  • Reuse this builder across projects with different needs
  • Deliver smaller assets → happier clients, lower bounce rates
  • No need to maintain a custom Webpack config per project

🛠️ DevOps & Performance Engineers

"I audit Lighthouse scores and trim fat."

  • Produce optimized assets for static hosting (S3, Netlify)
  • A/B test bundle sizes with real component subsets
  • Generate SRI-ready files for secure CDN delivery

🧪 Prototypers & Educators

"I'm teaching Bootstrap or mocking up a concept."

  • Generate shareable, self-contained demos
  • Show students how tree-shaking works in practice
  • Create minimal reproducible examples for bug reports

How to Optimize Bootstrap 5 JavaScript: 3 Approaches

The official docs suggest modules/bundlers. Here's how this no-build approach compares.

Approach How It Works Pros Cons
Official: Full Bundle Include bootstrap.bundle.min.js via CDN ✅ Zero setup
✅ Works everywhere		 ❌ ~70KB even if you only use Modal
❌ No tree-shaking
Official: Manual Modules Import individual js/dist/*.js files ✅ Smaller than full bundle
✅ No bundler required		 ❌ Still includes unused code inside each file
❌ Manual dependency management (Popper, etc.)
Official: Bundler + ESM Use Webpack/Vite + import { Modal } from 'bootstrap' ✅ True tree-shaking
✅ ESM / TypeScript ready
✅ Framework compatible		 ❌ Requires Node.js + build step
❌ Slower iteration (rebuild on changes)
❌ Higher learning curve
This Builder: Browser Tree-Shaking Select components → Rollup fetches source → Terser minifies → Download ✅ True tree-shaking (~8-15KB)
✅ Zero build tools
✅ Instant iteration
✅ Multiple formats (.js/.gz/.br/.zip)		 ❌ IIFE output only (ESM might come)
❌ Best for vanilla JS / static sites

✅ Use This Builder If...

  • You want smaller bundles without a build step
  • You're building static sites, landing pages, or prototypes
  • You prefer browser-based tools over Node.js
  • You need quick iteration with different component combos

✅ Use Official Bootstrap If...

  • You're using React, Vue, or Angular
  • You need ESM modules or TypeScript types
  • You already have a Webpack/Vite pipeline
  • You need jQuery compatibility or advanced sanitizer config
Bottom line: If you want true tree-shaking without setting up Node.js, Webpack, or Vite, this builder delivers production-ready bundles in seconds — with the same Bootstrap API you already know.
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Last Tips
  • Use .br for modern servers (Brotli ≈ 15% smaller than Gzip).
  • Keep Popper external if you already load it elsewhere to avoid duplication.
  • If using inline JS (copy/paste), ensure your CSP allows script-src 'unsafe-inline'.
  • Prefer downloading the file and hosting it with SRI hashes.