---
title: WordPress Core File Scanner
canonical: https://wpsecurityninja.com/core-scanner/
---
# Make sure WordPress core is still clean

The Core Scanner compares your core files to the official WordPress.org copies so you can spot modifications, infections, and unexpected additions.

- [Get Pro](https://wpsecurityninja.com/pricing/)
- [Try Free](https://wordpress.org/plugins/security-ninja/)

## Core files should never be a mystery

Hackers love modifying core. Comparing against WordPress.org originals is one of the fastest ways to see if something changed that should not have.

- Checksum comparison against official files
- Spot unknown or modified core files
- View or restore guidance when issues appear

[Core scanner docs](https://wpsecurityninja.com/docs/core-scanner/scan-wordpress/)

## Pair with malware scanning on Pro

Core checks are essential. Pro malware scanning extends detection into plugins, themes, and other site files, plus cleanup tools.

- Malware signatures and suspicious patterns
- Plugin integrity checks
- Scheduled rescans

[Malware scanner](https://wpsecurityninja.com/malware-scanner/)

## FAQ

### Is the Core Scanner free?

Yes. It is included in the free Security Ninja plugin.

### What if a file does not match?

Treat mismatches seriously. Review the file, restore from official sources when appropriate, and investigate how it changed. Full diagnostic: [WordPress core files were modified](https://wpsecurityninja.com/wordpress-core-files-were-modified/).

## Check core files free. Add malware scanning with Pro.

Use Core Scanner on Free, then add malware scanning and Cloud Firewall with Pro.

[See pricing](https://wpsecurityninja.com/pricing/)