Ghost PDF - Hide a PDF Inside Another PDF

Everyone who opens the file sees an ordinary PDF. Up to 5 hidden PDFs or notes travel inside it, each opened by its own password. Everything happens in your browser: nothing is uploaded.

Drop any PDF here If it hides documents, we open it for you. If not, it becomes the cover of a new Ghost PDF.

Hide PDFs

Pick a cover PDF, add up to 5 hidden PDFs or notes with their own passwords, and get one file that looks completely normal.

Open a Ghost PDF

Received a Ghost PDF? Open it here and enter your password to reveal what is inside.

How hidden is it? Hidden PDFs are strongly encrypted and invisible in normal PDF readers. They are not undetectable: the file is larger than the cover alone, and apps that re-save PDFs remove the hidden part. Send the file unchanged, as an attachment.

Your files never leave this browser.

What is a Ghost PDF?

A Ghost PDF looks and behaves like an ordinary PDF. Anyone who opens it in Adobe Reader, a browser or a phone sees only the cover document.

Inside it, up to five more PDFs or notes are stored with strong encryption. Each one has its own password, so you can share one file with several people and give each of them access to a different hidden document.

The hidden PDFs are opened on this page, in the recipient's browser. Nothing is uploaded, and PDF-Lab never sees your files or passwords.

How to hide a PDF inside another PDF

Choose the cover

Pick the PDF that everyone is allowed to see.

Add hidden PDFs or notes

Upload up to five PDFs or write notes, and give each one a different password.

Create and send

Download the Ghost PDF and send it as an attachment. Share each password separately.

Open it

The recipient opens the file on this page and enters their password to reveal their PDF.

Why use Ghost PDF?

Private by design

Encryption happens in your browser. Files and passwords are never uploaded.

One file, several readers

Up to five hidden PDFs or notes, each with its own password. One password never reveals another PDF.

Strong encryption

AES-256 with a key derived from each password. Any change to the file is detected.

Looks ordinary

Normal PDF readers show only the cover. There is no attachment icon.

When people use it

Sending a newsletter to a team, with a private note for one person inside it

Keeping a confidential appendix with a public report

Sharing one file with several people, each able to open only their own document

Storing private copies of documents behind an ordinary-looking cover

Frequently asked questions

Can anyone tell that a PDF hides something?

Normal PDF readers show only the cover. A specialist looking at the file could notice that it is larger than its pages need. The hidden PDFs stay unreadable without their passwords.

Can I write a note instead of uploading a PDF?

Yes. Choose "Write a note" on a hidden item to type text with headings, lists and pictures, in any language. It becomes a PDF of page images inside the Ghost PDF, so its text cannot be selected or searched.

What if I forget a password?

The hidden PDF cannot be recovered. There is no reset, because the password is the only key and it is never stored anywhere.

Why did the hidden PDF disappear?

Apps that re-save or compress PDFs (some email systems, editors and messaging apps) rebuild the file and drop the hidden part. Send the Ghost PDF unchanged, as an attachment.

Does one password show the other hidden PDFs?

No. Each password opens only its own PDF, and the page never says how many PDFs are hidden.

Is anything uploaded to PDF-Lab?

No. Creating and opening Ghost PDFs happen entirely in your browser.

How large can the files be?

The cover can be up to 50 MB and each hidden PDF up to 25 MB, with 100 MB in total.