DOMGuard - Hide Secrets Before You Share or Paste to AI

Hide API keys, emails and card numbers on any page, then copy a clean screenshot to share or paste into AI tools.

Stop leaking secrets before you share a page or paste it into an AI tool. DOMGuard hides sensitive information on web pages, and can show text that people cannot see but an AI tool might still read. HIDE SENSITIVE DATA Click any element on a page to hide it (free) Choose a solid black or blurred mask Masks stay with the page as you scroll Free: manual masking is not limited AUTO SCAN AND MASK (PRO) One click finds API keys (OpenAI, Anthropic, AWS, GitHub, Stripe), JWT tokens, and card numbers, then covers them Email addresses and phone numbers stay visible until you turn them on Phone numbers cover international format and Taiwan mobile numbers Card numbers are checked before masking to reduce false alarms While automatic masks are on, hold Alt to peek at the original text SHOW HIDDEN TEXT (PRO) Some pages contain text people cannot see, such as near-invisible, tiny, or off-screen text, written to give instructions to AI tools. Show Hidden Text outlines where it is and lists what it says. A line that looks like an instruction to an AI is marked as a best guess, not a guarantee. PROTECT ALL SITES (PRO) One switch for the websites you visit. It stays off until you turn it on and allow access to all sites Hides hidden text as pages load and change Can also mask API keys, tokens, and card numbers automatically. Emails and phone numbers can be added in settings You can pause it on specific sites Hiding happens on the page. DOMGuard does not record your screen and does not connect to other capture tools. Text inside iframes, or inside closed parts of a page, can remain visible SCREENSHOTS Capture what you can see and copy it to the clipboard. Paste with Ctrl+V on Windows or Command+V on Mac. DOMGuard does not download or save the picture. Drag a rectangle, or enter a width and height, to capture one area Capture the visible area from the toolbar Free: 3 plain screenshots per local day. These copies do not remove hidden text Pro: unlimited screenshots. These hide hidden text and clean faint pixels before the copy A shortcut capture may ask you to press Copy. Copying can fail on some pages PRIVATE BY DESIGN Page content and screenshots are processed in your browser and are not uploaded No analytics, no tracking The only network connection is to ExtensionPay, to check Pro purchases DOMGuard runs on the tab you open, unless you turn on Protect all sites PRICING Free to start. DOMGuard Pro is a one-time $4.99 purchase, with no subscription. Payments are handled by ExtensionPay and Stripe. ExtensionPay keeps the email used for your purchase. See the privacy policy for details. After you pay, quit Chrome completely and open DOMGuard again. Stripe can stay on its receipt page, and that page does not refresh the extension. If the plan still says Free, choose Restore purchase, sign in with the email from checkout, then quit Chrome and open DOMGuard again. GOOD TO KNOW Works on web pages in your browser only, not in other desktop apps Chrome blocks extensions on chrome:// pages, the Chrome Web Store, the New Tab page, and the built-in PDF viewer Screenshots cover the visible area of the current tab Detection is best-effort. It cannot guarantee that every secret or every hidden instruction is found. Review the screen before sharing