Web Workers

Web Workers can parallelize computationally heavy operations, freeing up the UI thread to respond to user input.

Verdict

Safe to use

Category

JavaScript APIs

Browser support

Can I Use

Works in

IE10+

Should you use Web Workers in 2026?

For browsers that do not support web workers, depending on your use case, you may choose not to offer the feature that web workers provide or to chunk it up and put it on the UI thread.

Polyfills and fallbacks

Progressive enhancement works well here: browsers without support degrade gracefully, so a dedicated polyfill is usually unnecessary.

Browser share on Can I Use Edit on GitHub