TypeScript Minifier
FormattersCompile TypeScript to JavaScript with Sucrase, then minify with Terser. Strips all type annotations, produces production-ready JS. Shows compression ratio. Browser-based.
About TypeScript Minifier
The TypeScript Minifier is a two-stage browser-based tool that first strips all TypeScript type annotations using Sucrase (the fastest TypeScript-to-JavaScript transformer), then applies Terser with `compress: true` and `mangle: true` to produce maximum-compression JavaScript. The entire pipeline — type stripping, transpilation, and minification — runs in a Web Worker inside the browser. Compression ratio and exact byte savings are displayed after each run. TSX is handled by the TSX Minifier; this tool targets `.ts` files only.
Features
- ✓Two-stage pipeline: Sucrase type-strips TS → Terser compresses and mangles
- ✓Sucrase typescript transform: removes all type annotations, interfaces, and decorators
- ✓Terser compression: dead code elimination, constant folding, var inlining
- ✓Terser mangling: renames identifiers to shortest possible names
- ✓Supports TypeScript 5.x syntax: satisfies, const type params, union types
- ✓Runs fully in a Web Worker — pipeline never blocks the UI
- ✓Displays compression ratio and exact byte savings after minification
- ✓Download minified output as a .ts file with one click
- ✓Language picker — instantly switch to JavaScript, JSX, TSX, or other minifiers
- ✓One-click clipboard copy of minified output
- ✓Mobile-responsive layout with a dedicated Minify button
- ✓100% client-side — your code never leaves the browser
Common Use Cases
- Producing minified JavaScript bundles from TypeScript source for distribution
- Compressing TypeScript utility files for CDN delivery
- Reducing TS module size before embedding in hybrid projects
- Quickly checking how much a TypeScript file compresses without running a build
- Generating minimal JavaScript output from TypeScript type-heavy files
Frequently Asked Questions
QDoes this preserve TypeScript type information?
No — Sucrase strips all type annotations as part of the TypeScript transform. The output is plain JavaScript with no type information. This is intentional: type annotations have no runtime meaning.
QWhy use Sucrase instead of the TypeScript compiler?
Sucrase is a bare-metal TypeScript stripper designed for speed — it does not perform type checking. This makes it extremely fast in the browser. For type-checked compilation, use the TypeScript compiler CLI locally.
QIs my code sent to a server?
No. Both Sucrase and Terser run in a Web Worker inside your browser. Nothing is transmitted to any server.