What is browser DLP?
Browser Data Loss Prevention (DLP) is a category of security tooling that stops sensitive data from leaving an organization through the web browser. It inspects what users type, paste, upload, and submit inside the browser — and applies policies in real time, before the data reaches a third-party service.
Why the browser is the new perimeter
Most modern work happens in a browser tab. Engineers paste code into ChatGPT, finance teams upload spreadsheets to SaaS apps, support agents copy customer records into web forms. Traditional DLP — built around endpoint agents and network gateways — was designed for an era of installed apps and on-premise file servers. It struggles with TLS-terminated SaaS traffic, encrypted clipboards, and browser-native APIs.
Where each DLP layer sees data
- Network DLP — inspects traffic at the egress point. Blind to anything inside an HTTPS session it cannot decrypt.
- Endpoint DLP — watches files and clipboard at the OS level. Generally unaware of which web app or form receives the data.
- Browser DLP — runs inside the page. Sees the destination URL, the input field, and the exact text — before it leaves the device.
How a browser DLP tool works
- An extension is deployed to managed browsers via group policy or the Edge / Chrome enterprise store.
- The extension hooks into input, paste, and form-submit events on every page.
- Each event is matched against policies — pattern-based (credit cards, API keys) and identity-based (your company's own data).
- Matching events are blocked, warned, or silently logged based on the policy action.
- Incidents stream to a central admin console for dashboards, forensics, and audit.
Common use cases
What to look for in a browser DLP
- Real-time blocking, not just after-the-fact logging
- Support for company-specific data, not only generic regex patterns
- Lightweight extension that does not slow page loads
- Central admin console with policy versioning and incident search
- Transparent pricing — per-user, not per-event
FlowLock is browser DLP built for 2026
Free Edge Store extension. Paid plans from €2 / user / month.