Browser Support for Our JavaScript PDF Viewer

PSPDFKit for Web (both Standalone and Server-Backed operational modes*) supports all commonly used browsers in their latest versions.

PSPDFKit for Web can be operated as a standalone JavaScript library that runs either entirely on the client or backed by Document Engine. Both operational modes support all commonly used browsers in their latest versions.


  • last two versions of Chrome

  • last two versions of Mozilla Firefox

  • Safari 15.4 or newer

  • last two versions of Edge

  • Firefox ESR

You can see the exact list of browsers supported by PSPDFKit for Web 2024.4.0 on

* Standalone mode 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 15.4 or newer 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 mode 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.