WhatsApp Privacy - Blur & Lock, by MULTIFACTUUM S.R.L., is a Chrome extension that shields WhatsApp Web sessions in public or shared spaces. It overlays a configurable privacy layer that hides on-screen chats and media and provides a tab-level screen lock to block casual viewers. Controls include adjustable concealment strength, hover-to-reveal, and inactivity-based auto-lock. The extension targets professionals, students, streamers and remote workers who need to reduce visible exposure while presenting or working in public.

Masks visible interface elements to reduce shoulder-surfing risk

The extension applies a visual privacy layer directly to WhatsApp Web so messages, contact and group names, profile pictures and media are obscured from onlookers. Adjustable blur strength and granular toggles let users choose which elements are affected. Temporary access to concealed items is possible via the hover-to-reveal interaction, giving brief visibility without changing global settings.

Maintains a light footprint and avoids altering WhatsApp Web behavior

Designed for minimal interference, the tool runs in the browser and does not change core WhatsApp Web workflows; the developer notes it is lightweight and compatible with Chromium-based browsers. The extension acts as an overlay on the page, so standard navigation, message sending and media playback continue while the privacy layer is active.

Keeps all data local to the browser for predictable privacy handling

Settings and lock data stay in the browser: there is no external upload of chat content, and the extension stores its configuration and the screen lock hash locally. That local-only model avoids server-side collection, and it means recovery of the screen lock depends on local storage actions rather than an online account reset.

Supports presenters and shared-workspace use with session controls

Practical for screen sharing and transient exposure control, the extension includes a full-page screen lock and auto-lock triggers when the tab loses focus or after inactivity. Those session controls, combined with element-level concealment, let presenters hide private conversations during live demos without removing WhatsApp Web from the browser.

A focused privacy aid for public WhatsApp Web users with a clear recovery trade-off

The extension is a practical option for professionals, students and streamers who need in-browser protection of visible chats while working or presenting. Its local-only handling and session controls match that use case, but the recovery path for a forgotten screen lock depends on clearing local storage or reinstalling the extension. Accept this trade-off if avoiding external data collection is a priority.