001
Quiet on real docs
Silent on the pages developers actually copy from — GitHub, Homebrew, package managers. It only speaks up when a page is trying to fool you.
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Live
Human execution boundary
The line a website can't make you cross.
A fake CAPTCHA or error page pressures you into copying a "verification command" and running it on your own computer. It's a scam — that command quietly hijacks your machine. ExecFence catches the trap and warns you first.
Free on the Chrome Web Store · works in Chrome, Edge, Brave and other Chromium browsers
ordinary traffic passes the linea trap is stopped at the fence
02 — The trap, and the fence
Every step of the scam looks ordinary. That is exactly why it works.
A page asks you to prove you're human. It hands you something to run. ExecFence steps in — before anything runs.
ExecFenceCritical
This website may be trying to trick you into running software on your computer.
- The page presents itself as a human-verification or CAPTCHA check.
- The command downloads something from the internet and runs it immediately.
- The page provides a one-click button that copies text for you.
What that command would do
Reaches the internetYes
Downloads a programYes
Runs what it downloadsYes
Reads saved passwords / keysNo
Close this tabInspect commandContinue anyway
03 — Built to be quiet
Loud only on tricks. Silent everywhere else.
002
Explains itself
Every warning says what the page asked and what the command would actually do — reach the internet, download a program, run it — in plain English.
003
Private by design
Everything is checked on your own computer. It never reads your system clipboard and never uploads what you copy.
004
You stay in control
Clear the tricked clipboard, close the tab, inspect the command, or continue anyway. It warns — it never locks you out.
04 — What leaves your device
0 bytesuploaded, ever
1permission requested
100%checked on your machine
At a glance
StatusLive
CategorySaaS & Web Apps
Year2026
StackChromium extension - TypeScript - on-device detection
Tags
See it catch one.
Safe, inert demo — nothing on it can run