How to Install a Local CRX File in Chrome with WebCRX

Updated

WebCRX is a Chrome utility that lets you install and test local CRX files in Chrome with permissions management. To use it, add WebCRX to Chrome from its page, open the utility, load your local CRX file, and review the permissions the extension requests before completing the install. This is aimed at people who already have a CRX file on their machine and want to test it locally rather than install from the Chrome Web Store.

What WebCRX Is For

Chrome does not normally make it easy to install an extension from a local CRX file — dragging a CRX into the browser or opening it directly often fails or is blocked. WebCRX exists to fill that gap: its page describes it as "an awesome utility that allows you install and test local CRX files in Chrome with permissions management."

Two things follow from that description:

  • It is a testing/utility tool, not a marketplace. You supply the CRX file; WebCRX handles the install flow.
  • Permissions are part of the flow. The "permissions management" wording means you should expect to see and review what the extension is asking for during install, rather than having it applied silently.

Prerequisites

Before starting, confirm you have:

  1. Google Chrome installed (WebCRX is a Chrome extension, so it runs in Chrome).
  2. A local CRX file — the extension package you want to install, already saved somewhere on your computer.
  3. Access to the WebCRX page at webcrx.io, where the "Add to chrome" action is offered.

If you don't yet have a CRX file, there is nothing for WebCRX to install; obtain or build the package first.

Step-by-Step: Install a Local CRX File

Step 1: Add WebCRX to Chrome

Go to the WebCRX page and use the "Add to chrome" button shown there. This installs WebCRX itself as a Chrome extension, which is the prerequisite for using its install utility.

Expected result: WebCRX appears among your installed Chrome extensions and is available to open.

Step 2: Open the WebCRX utility

Launch WebCRX from your Chrome extensions (for example, via the extensions toolbar icon or the Chrome extensions page). The utility is where the local CRX install happens.

Step 3: Load your local CRX file

In the WebCRX interface, select or point it to the CRX file stored on your computer. This is the input the utility acts on — the file you want Chrome to install.

Expected result: WebCRX reads the CRX and presents the extension for installation.

Step 4: Review the requested permissions

Before confirming, read the permission list the extension requests. WebCRX's stated purpose includes permissions management, so this review step is central: decide whether the permissions match what you expect the extension to do.

Step 5: Complete the install

Confirm the installation. Chrome should then treat the extension as installed, and you can enable, test, or remove it like other extensions.

Verification: Open Chrome's extensions page and confirm the extension is listed and enabled. Then exercise its main function to check it behaves as expected.

Common Snags and How to Handle Them

Situation What to check
"Add to chrome" doesn't seem to do anything Confirm you're on the WebCRX page in Chrome itself, not another browser, and that the extension actually appears in your extensions list afterward.
WebCRX can't find or read your CRX Verify the file is a genuine .crx package saved locally and that you selected the correct file.
The extension installs but misbehaves Re-check the permissions you granted; a missing permission can break functionality, and an unexpected one is a reason to remove it.
You want to undo the test Remove the extension from Chrome's extensions page as you would any other extension.

When This Approach Makes Sense

Use WebCRX when you have a CRX file on disk and need to install or test it in Chrome — for example, testing a build of your own extension before distribution, or checking a package you obtained outside the Web Store. If the extension is available in the Chrome Web Store, installing from there is the simpler path and doesn't require a local file or a helper utility.

The page does not state pricing or account requirements for WebCRX, so treat availability as described on the site itself and confirm any conditions there before relying on it.