Now live on the Chrome Web Store

You read your document. AI comes up empty.

Pick a file, click once, and get back a protected copy that looks identical to you — but keeps your private details out of reach when AI tools try to read it.

Add to Chrome — it's free See how it works ↓
Runs entirely on your device · Your document is never uploaded · Nothing tracked

Built for the AI tools you already use

Cloak a document once, and the same copy is ready for whichever AI assistant you hand it to.

How it works

Three steps to a cloaked document

No setup, no settings to wrestle with. Pick a file, click, and Sunda handles the rest right on your computer.

1

Pick your file

Open Sunda Cloak and choose the Word, RTF, or OpenDocument file you want to protect. It never leaves your device.

2

Click to cloak

One click and Sunda quietly creates a cloaked copy. To you, it reads exactly like the original — same words, same look.

3

Share with confidence

Send, store, or upload the cloaked copy anywhere. You see your real words — while AI tools are left struggling to read it.

In action

The whole thing, in three taps.

This is the actual Sunda Cloak popup — no mockups. Open it, pick a file, and download a cloaked copy. Here’s how that story plays out.

  1. The Sunda Cloak popup open and ready: the smiling sunglasses sun mascot above a Sunda is on duty greeting, a Protect a file picker, and a 14-day free trial notice.
    On duty. Open the popup — Sunda’s already standing guard.
  2. The same popup with a file chosen: testing-llms-sample.docx at 6.9 KB is selected and the amber Protect and download button is now enabled.
    Pick a file. Choose any Word, RTF, or OpenDocument file. It stays on your machine.
  3. The popup after protecting, showing a Done — downloaded testing-llms-sample.downloaded.docx confirmation message.
    Cloaked & downloaded. One click later, your protected copy is in your Downloads.

Every step runs right here on your device — nothing is ever uploaded.

Just landed

Sunda learned some new tricks

Three new helpers, and every single one works right on your device. Two live as switches in that same little window and stay off until you flip them; the third — hiding personal details — is built in and on from day one, with nothing to set up.

  • The new upload protection card in the Sunda Cloak popup: a switch labeled Protect files I upload to websites turned on, with a list of approved websites, an Add site button, and a status reading On — protecting uploads on your approved sites.
    Protect files as you upload them. Flip one switch, approve the websites you upload to, and the Word, OpenDocument, and rich-text files you attach on those sites go out cloaked — automatically. Everywhere else, Sunda stays out of the way entirely. If anything ever hiccups, your original file goes through untouched and you'll see a friendly note.
  • Sunda Cloak's Hide personal details protection, which is now built in and on by default — no switch to flip and no setup button to click.
    Hide personal details. Built in and on by default: Sunda spots names, emails, and other personal bits, and tucks them out of an AI's sight — it sets itself up automatically, with nothing to configure. Your real details are never changed; they're just harder for AI to pick out (it helps, though it's not a complete defense). And it all runs on your own computer, so nothing about your document is ever sent anywhere.
  • The new tripwire card in the popup: Get notified if an AI opens your file with an ARMED chip, a switch turned on, and a link reading See which files were opened.
    Know when an AI peeks. Our favorite: a tiny tripwire. If an AI opens your protected file, you find out on your Sunda dashboard. It can't catch every AI — but the sneaky ones are in for a surprise.
See the difference

Same to you. Out of reach for AI.

Here's the same paragraph two ways: what you read when you open the file, and how little an AI tool can actually take from it.

What you read

Our Q3 revenue reached $4.2 million, up 18% from last year. The board approved the Northwind acquisition on March 9th, with Maria Chen leading the integration.

What the AI gets

Our Q3 revenue reached ▪▪▪▪▪, ▪▪▪ from last year. The board ▪▪▪▪▪▪ the ▪▪▪▪▪▪▪ deal on ▪▪▪▪▪▪, with ▪▪▪▪▪ leading the ▪▪▪▪▪.

The same paragraph to you — but your real numbers, names, and dates stay out of the AI's reach.

Why people cloak

Clever protection that feels like magic

Everything you'd want from a document privacy tool, and nothing you have to think about.

Looks exactly like yours

Open the cloaked copy and it's identical — every word, number, and line right where you left it. The protection is invisible to you.

Your details, kept private

The names, numbers, and dates that make your document yours stay private from the AI tools that try to read it.

Private by design

Everything happens on your own device. Your document is never uploaded, and there's no tracking — ever.

Works with the tools you use

Cloak once and your file is ready for ChatGPT, Claude, Copilot, and Gemini, with nothing extra to configure.

Smarter with on-device AI

On supported computers, Sunda uses on-device AI to protect your document even more thoroughly — and it never sends a thing online.

One click, that's it

No accounts to wire up, no dials to tune. Pick a file, click once, and you're done.

Human eyes only

Some words are meant for human eyes only

Not everything you write should end up as a snack for a robot. Here's when you'll want your docs to stay cozy and human-only.

The “shhh, this is confidential” doc

Legal terms, medical notes, that spicy HR memo. Meant for a person to read carefully — not to vanish into some chatbot's memory.

The “I made this with my brain” doc

Your research, your report, your unpublished novel. You poured real expertise in. It shouldn't get copy-pasted, summarized, and repackaged in thirty seconds flat.

The “actually read it, please” doc

Take-home exams, application essays, real assignments. The whole point is that you think it through — no “tl;dr this for me” allowed.

The “every word matters” doc

Contracts, safety steps, poetry. An AI summary would flatten all the nuance that makes it, well, the point.

The “gotcha” doc (our favorite)

Looks totally normal to you — but the moment a sneaky AI tries to gobble it up, it trips a little tripwire and you find out. Sneaky little guardian.

By the numbers

Simple where it counts

Powerful protection that stays refreshingly simple to live with.

1 click
From your file to a cloaked copy
0 uploads
Your document never leaves your device
100%
Runs on your own computer
3 formats
Word, RTF, and OpenDocument files
Pricing

One simple plan, free to try

Start with a 14-day free trial. Keep going for $2.99 a month — less than a coffee. Cancel anytime.

14-Day Free Trial

$0
for 14 days · full access
  • Cloak DOCX, RTF, and OpenDocument files
  • One-click protection, no setup
  • Everything runs on your device
  • Works with ChatGPT, Claude, Copilot & Gemini
  • No card charged during your trial
Start your free trial
14-day free trial

Sunda Pro

$2.99/mo
per month · cancel anytime
  • Unlimited document cloaking
  • One-click protection on every file
  • Stronger protection with on-device AI
  • Always private — nothing uploaded, nothing tracked
  • Works with ChatGPT, Claude, Copilot & Gemini
  • Cancel anytime, no questions asked
Add to Chrome — $2.99/mo
Good questions

The short answers

Never. Sunda Cloak does all its work right on your own device. Your file isn't sent to us, to the cloud, or to anyone else, and nothing about it is tracked.

Yes. When you open it, you'll see exactly what you wrote — same words, same numbers, same layout. The protection only shows up to AI tools trying to read it.

Word documents (DOCX), Rich Text files (RTF), and OpenDocument files (ODT). Pick one, click once, and you get a cloaked copy back.

Not at all. If you can open a file and click a button, you can use Sunda Cloak. There's nothing to set up and nothing to configure.

You can try everything free for 14 days. After that, Sunda Pro is $2.99 a month, and you can cancel anytime.

Keep your documents yours

Cloak the files you care about in one click — private, on your device, and ready for any AI tool.

Add to Chrome — it's free See pricing

Free for 14 days, then $2.99/month. Cancel anytime.