Face Similarity Meter

About Face Similarity Meter

Our Face Similarity Meter uses advanced AI and facial recognition technology to compare two faces and calculate their similarity percentage. Powered by face-api.js running entirely in your browser, it provides instant results while keeping your photos completely private.

The tool detects faces in both images, extracts facial features using deep learning, and calculates similarity using cosine distance metrics. The result is displayed as a percentage (0-100%) where higher values indicate more similar faces. Perfect for finding lookalikes, verifying identities, or just for fun comparisons.

How does Face Similarity Comparison work?

The tool uses face-api.js with FaceNet-inspired models. It first detects faces in both images, then extracts a 128-dimensional face descriptor (facial feature vector) from each face. These descriptors are compared using Euclidean distance to calculate similarity, which is then converted to a percentage where 100% means identical and 0% means completely different.

Are my photos private and secure?

Yes, completely! All face detection and comparison happens locally in your browser. Your photos are never uploaded to any server or shared with anyone. The AI models run entirely on your device, ensuring complete privacy and security for your images.

How accurate is the similarity percentage?

The accuracy depends on image quality, lighting, face angles, and facial expressions. The model works best with clear, front-facing photos in good lighting. Scores above 80% usually indicate the same person, 60-80% could be the same person or relatives, 40-60% might be related, and below 40% are likely different people. Results should be used as estimates, not definitive proof.

What makes faces similar or different?

The AI analyzes facial features like eye spacing, nose shape, face structure, jawline, and overall facial proportions. It creates a mathematical representation of these features and compares them between the two faces. Identical twins typically score 85-95%, while unrelated people usually score below 40%.

What image formats are supported?

The tool supports all common image formats including JPG, JPEG, PNG, WEBP, and GIF. For best results, use high-quality photos with clear, well-lit faces facing the camera. Avoid photos with sunglasses, masks, or heavy shadows.

Does it work offline?

After the initial model download (about 5-10MB, one time only), the tool works completely offline. Once loaded, you can use it without an internet connection since all processing happens locally in your browser.