FlowLock
Guide

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, then 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.

What network and endpoint DLP miss

FlowLock is browser DLP only. It covers the gaps the legacy layers cannot see.

  • 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

  1. An extension is deployed to managed browsers via group policy or the Edge / Chrome enterprise store.
  2. The extension hooks into input, paste, and form-submit events on every page.
  3. Each event is matched against policies, including pattern-based (credit cards, API keys) and identity-based (your company's own data).
  4. Matching events are blocked, warned, or silently logged based on the policy action.
  5. Incidents stream to a central admin console for dashboards, forensics, and audit.

Common use cases

Prevent source code from being pasted into public AI tools
Stop customer PII from being uploaded to unsanctioned SaaS
Detect credential leaks into webmail and Slack web
Audit which destinations receive your company's confidential terms

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 per-user pricing, not per-event pricing

FlowLock is browser DLP built for 2026

Free Edge Store extension. Paid plans from €2 / user / month.