> For the complete documentation index, see [llms.txt](https://docs.vida.id/identity-stack/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vida.id/identity-stack/verify/biometric-verification.md).

# Biometric Verification

## Biometric Verification

Biometric Verification is part of the VIDA Verify API. It confirms that a user is a **real, live person** and that their face **matches their ID photo**, so you can authenticate identity accurately and securely.

It combines two features:

|                         | Image Liveness Verification        | Image Face Match Verification             |
| ----------------------- | ---------------------------------- | ----------------------------------------- |
| **Question it answers** | Is a live person present?          | Do these two images show the same person? |
| **Compares**            | Live selfie only                   | Selfie and ID photo                       |
| **Protects against**    | Static images and spoofed attempts | Wrong person using a valid ID             |

{% hint style="info" %}
**Before you integrate:** Make sure your images meet the requirements for the liveness check. See Image requirements.
{% endhint %}

### Image Liveness Verification

Confirms that a live person is present during authentication, and tells a live individual apart from a static image.

* Analyzes subtle facial movements and real-time responses in a live selfie
* Uses anti-spoofing techniques to detect and prevent fraudulent attempts
* Protects the authenticity of the whole verification process

### Image Face Match Verification

Checks whether two images belong to the same person, typically a selfie and an ID photo.

* Extracts facial features from both images using facial recognition algorithms and deep learning models
* Compares distinct characteristics, such as the position of the eyes, nose, and mouth
* Returns a confirmation when the images match

### How they work together

Together, the two features give you a layered check: liveness proves the person is real, and face match proves they are the right person. This gives you high security and reliability for user authentication.

{% hint style="success" %}
Ready to integrate? See the Biometric Verification API for endpoints, request formats, and sample responses.
{% endhint %}