Browser Support for Our JavaScript PDF Viewer

PSPDFKit for Web (both the server-backed and standalone deployment options*) supports all commonly used browsers in their latest versions.


  • last two versions of Chrome

  • last two versions of Mozilla Firefox

  • last two versions of Safari

  • last two versions of Edge

  • Firefox ESR

  • Microsoft Edge 18

  • Microsoft Internet Explorer 11


Internet Explorer 11 will no longer be supported in our Web SDK starting with version 2022.5.

You can see the exact list of browsers supported by PSPDFKit for Web 2022.4.2 on

* Standalone deployment renders PDF documents in the client browser, so rendering performance will depend on the host machine.

Long-Term Support

The only browser vendor currently supporting an LTS (Long Term Service) / ESR (Extended Support Release) version is Mozilla Firefox. See Firefox Extended Support Release for details.

We support the last available version of Firefox ESR.

All browsers without an LTSR (Long Term Service Release) require regular updates to new versions to fix security vulnerabilities.

Note that some LTS versions of Windows 10 ship without Microsoft Edge. We still support Microsoft Internet Explorer 11 for such systems.


  • Chrome on Android

  • Safari on iOS

As all of these browsers auto update, we test with the latest stable release. PSPDFKit for Web generally still works, even if you’re a few versions behind, as we are careful in adopting the latest web features for essential functionality and use polyfills for missing functionality.


PSPDFKit for Web includes the following polyfills to enable next-generation features on our target platforms:


The standalone version of PSPDFKit for Web uses WebAssembly to render documents. Please see our Real-World WebAssembly Benchmark to test the performance of your browser and OS, or learn more in the Performance guide.