---
description: File check in Zero Trust.
title: File check
image: https://developers.cloudflare.com/og-docs.png
---

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# File check

Last updated May 1, 2026|Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/cloudflare-one/reusable-components/posture-checks/client-checks/file-check/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

The File Check device posture attribute checks for the presence of a file on a device. You can create multiple file checks for each operating system you need to run it on, or if you need to check for multiple files.

## Prerequisites

- Cloudflare One Client is [deployed](https://developers.cloudflare.com/cloudflare-one/team-and-resources/devices/cloudflare-one-client/deployment/) on the device. For a list of supported modes and operating systems, refer to [Cloudflare One Client Checks](https://developers.cloudflare.com/cloudflare-one/reusable-components/posture-checks/client-checks/).

## Configure a file check

1. In the [Cloudflare dashboard ↗](https://dash.cloudflare.com/), go to **Zero Trust** > **Reusable components** > **Posture checks**.
2. Go to **Cloudflare One Client checks** and select **Add a check**.
3. Select **File Check**.
4. You will be prompted for the following information:
   1. **Name**: Enter a unique name for this device posture check.
   2. **Operating system**: Select your operating system.
   3. **File Path**: Enter a file path (for example, `c:\my folder\myfile.exe`).<details><summary>

      Environment variables</summary>

File paths can include environment variables to account for differences across devices. Environment variables are resolved in the context of the Cloudflare One Client daemon, not the logged-in user. Only variables available to the daemon process at runtime will work.
      - **Windows**: Use <code>%VAR%</code> syntax. For example, <code>%PROGRAMFILES%\myfolder\myfile.exe</code>.
      - **macOS/Linux**: Use <code>${VAR}</code> syntax. For example, <code>${RUNTIME_DIRECTORY}/myfolder/myfile</code>.</details>

   4. **Signing certificate thumbprint (recommended)**: Enter the [thumbprint](https://developers.cloudflare.com/cloudflare-one/reusable-components/posture-checks/client-checks/application-check/#determine-the-signing-thumbprint) of the publishing certificate used to sign the file. Adding this information will enable the check to ensure that the file was signed by the expected software developer.
   5. **SHA-256 (optional)**: Enter the [SHA-256 value](https://developers.cloudflare.com/cloudflare-one/reusable-components/posture-checks/client-checks/application-check/#determine-the-sha-256-value) of the file. This is used to ensure the integrity of the file on the device.
5. Select **Save**.

Next, go to **Insights** > **Logs** > **Posture logs** and verify that the file check is returning the expected results.

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