Bundle Size Analyzer
Upload a JavaScript bundle and instantly see raw, minified, gzip and brotli sizes — plus the top modules eating your budget.
Runs in your browser Real gzip sizes Warnings + tips
What it does
Top modules
Detects bundler comments (Webpack, Vite, Rollup) and ranks the biggest modules in your bundle.
Real compressed sizes
Uses the browser's CompressionStream for true gzip size, plus a brotli estimate.
Smart warnings
Flags bundles over budget, unminified builds, and known-heavy packages like moment.js or full lodash.
Frequently Asked Questions
Quick answers about the bundle analyzer.
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