Control over AI
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AI data leakage 7 min read

Before you paste a PDF into ChatGPT, redact it

Advice on safe AI use is almost always about what you type. But a full case file, contract, or report uploaded wholesale skips that advice entirely. Here is what to do about the document, not just the prompt.

ChatGPT5
Summarise the last 3 support emails from this customer.
Paste the emails or the customer name and I will help turn them into a short summary.
ChatGPT can make mistakes. Check important info.

The example above is interactive. Click a highlighted value to see your action options.

Quick answer

Prompt redaction advice covers what you type, not what you upload. When a full PDF, a case file, a contract, gets pasted or attached to an AI tool, the names, dates of birth, and account numbers inside it go with it, in one step, with no highlight to catch them. BeeSensible's desktop app opens the PDF first, marks the sensitive fields on the page, and produces a clean copy to share or paste in, before any of it reaches an AI tool.

01

Most AI-safety advice is about typed prompts, not uploaded files

02

A single PDF upload can carry far more personal data than a typed prompt ever would

03

The desktop app marks sensitive fields in a PDF before you share it or paste it into AI

04

PDF only today, no Word, Excel, images, or scanned documents

05

This works alongside real-time prompt protection, not instead of it

A caseworker has a ten-page PDF and wants a two-line summary. She opens ChatGPT, uploads the file, and asks for the highlights. Done in ten seconds.

That file had a client's full name, date of birth, national ID number, and a paragraph about a family situation that was never meant to leave the case management system. None of it was typed. It went in as one upload, in one step, with nothing to catch it.

The advice you have read is about typing, not uploading

Guides on safe AI prompts tell you to remove names, replace identifiers, mask account numbers. Good advice, and BeeSensible's own browser extension is built around exactly that moment: the text field, while you type, before you send.

ChatGPT5
Summarise the last 3 support emails from this customer.
Paste the emails or the customer name and I will help turn them into a short summary.
ChatGPT can make mistakes. Check important info.
Hover or tap a highlighted value to replace, mask, or delete it - before the draft reaches anyone.

But a PDF upload does not go through a text field. The whole document goes in at once, formatting and all. Whatever prompt-hygiene habit you have built for typed text does not apply, because there was no typing to catch.

What is actually in that file

A single case file, contract, or report routinely carries more personal data than a week of typed prompts combined: full names, dates of birth, national ID numbers, medical codes, account numbers, addresses, the names of people who are not even the subject of the file but show up in a paragraph about them.

None of that is unusual. It is what a normal working document looks like. The problem is only that none of it gets a second look before it goes into a tool that was never asked to keep it confidential.

Redacting the document, not the prompt

BeeSensible's desktop app (macOS and Windows) is built for exactly this moment. Open a PDF, and the sensitive fields on the page are marked, with the most sensitive ones, national ID numbers, financial details, called out more strongly than the rest.

You uncheck anything that should stay, draw a box by hand over anything the detection missed, and export a clean copy. Hidden document metadata is stripped in the same step, so nothing leaks through the file's properties either.

PreviewAnonymise (4)
The desktop app marks sensitive fields in a document for you to redact before you share it or paste it into AI.

This is PDF only today. Word documents, Excel spreadsheets, images, and scanned PDFs are not supported yet, so a photographed page or a spreadsheet with sensitive columns still needs a human eye. Where the document is processed follows the same on-device or EU-cloud setting as the rest of BeeSensible: on-device, the file never leaves the machine.

The tool it is going into matters too

A redacted PDF is safer to share regardless of where it ends up. But which AI tool it ends up in is its own question, and organisations increasingly cannot answer it for every tool their people have opened.

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A clean document pasted into a tool your organisation has never assessed is a smaller problem than an unredacted one, but it is still a decision worth making on purpose rather than by default.

Prompt hygiene and document hygiene are the same discipline

Typed text and uploaded files are two different moments with the same underlying risk: personal data reaching a tool before anyone looked at what was actually in it. Treating only one of those moments as the risk leaves the other wide open.

Redact the document. Watch the prompt. Neither one covers what the other does.

FAQ

Common questions

Does BeeSensible scan documents automatically?

No. The Document Redaction module is a deliberate step: you open a file in the desktop app, review what it marks as sensitive, and choose what to redact before exporting a clean copy. It does not run in the background and does not scan your files without you opening them.

What file types does it support?

PDF only today. Word documents, Excel spreadsheets, images, and scanned PDFs (PDFs that are really just photos of a page, with no underlying text) are not supported yet.

Does this replace the browser extension?

No, they cover different moments. The browser extension highlights sensitive data while you type into an AI tool, email, or chat. Document Redaction covers the file itself, before you attach it, upload it, or paste its contents somewhere. Most teams use both.

Where does the document go while it is being checked?

Follows the same setting as the rest of BeeSensible: on-device, the file never leaves the machine. In cloud mode, it is sent to BeeSensible's EU infrastructure for the same analysis and is not stored afterwards.

See how BeeSensible works

Detect sensitive data before it leaves your team, in any app, in real time.