Custom Builder for zip.js

Select your preferred settings to generate a customized, standalone build of zip.js

Configuration

Use Web Workers (Inline)

Speed & RAM: Improves responsiveness by running compression on background threads (multi-core support). Consumes more RAM only when compressing multiple entries in parallel.

Compression Implementation:

Features vs Compatibility:

WASM/JS: Supports custom compression levels, deflate64 decompression, and older environments (requires no browser-native streams support).
None (Native): Smallest size but relies on modern CompressionStream/DecompressionStream APIs (only 'deflate' and no custom levels).

WASM (zlib-wasm)
JS (zlib-js)
None (Native Streams Only)

Support fallback to main thread

Impact: If unchecked, space is saved but compression will fail if Web Workers are not available or fail to start.

File System API (fs):

Rich Management: Higher-level API that allows editing, adding, and removing files from ZIP archives in a virtual file system.

Include API

Output Format:
UMD (Global window.zip) ESM (Modern Modules)

Minify with Terser