AI Face Anonymization Explained: How It Works

What is AI face anonymization?

AI face anonymization replaces a real face in a photo or video with a synthetic face generated by artificial intelligence. Unlike blurring or pixelation, the result looks completely natural — a realistic human face that does not correspond to any real person.

The generated face preserves the expression, lighting, skin tone, and head position of the original. Only the identity changes.

How HEIAN works: the privacy-first approach

Most face anonymization tools require you to upload your photo to a server. HEIAN takes a fundamentally different approach:

• —Step 1 — Client-side detection: Your browser runs Google's MediaPipe AI to detect 468 facial landmarks. This happens entirely on your device. No image data is transmitted
• —Step 2 — Parameter extraction: From these landmarks, we extract abstract parameters: facial geometry ratios, average skin tone (RGB), lighting direction, and expression data (52 blendshapes)
• —Step 3 — Synthetic generation: Only these abstract parameters are sent to our generation server. An AI model (Stable Diffusion) generates a new face conditioned on these parameters
• —Step 4 — Client-side compositing: The synthetic face is sent back to your browser and composited onto your original image locally. The final result never passes through our servers

What data leaves your device?

Only abstract, non-reconstructable parameters:

• —468 geometric landmark coordinates (x, y, z positions — not pixels)
• —Skin tone as 3 numbers (average R, G, B values)
• —Lighting direction as 3 numbers (a vector)
• —52 expression blendshape values (muscle activation percentages)
• —Face bounding box dimensions (width and height ratio)

What never leaves your device:

• —Your original photo pixels
• —Face embeddings or identity vectors
• —Any data that could reconstruct your face

Can the synthetic face be reversed?

No. The generation process is one-way. The AI creates a new face from scratch based on abstract parameters. There is no mathematical path from the synthetic face back to your original face. Even if someone obtained all the parameters we use, they could not reconstruct your identity — the parameters describe general facial proportions shared by millions of people.

Legal compliance: EU AI Act

The EU AI Act (Article 50, effective August 2026) requires that AI-generated or manipulated content be labeled. HEIAN automatically adds:

• —A discrete visual watermark indicating AI generation
• —Machine-readable metadata in the image file

This keeps you compliant without effort. The watermark is subtle enough for social media but detectable by verification tools.

HEIAN vs other approaches

Try it yourself

HEIAN is free to try. No account needed. Upload a photo and see the result in seconds.