GhostMark PDF Tools

Secure document tracking and protection tools for your PDFs

Home | Add Watermark | Extract Watermark | Add QR Code | Scan QR Code | Font Steganography

Available Features

Invisible Watermarking

Add invisible text watermarks to your PDF documents that can only be detected by our specialized tools.

Add Watermark

Watermark Extraction

Extract hidden watermarks from PDFs or even screenshots of watermarked documents to identify the source.

Extract Watermark

QR Code Embedding

Add a small QR code to the bottom-right corner of your PDF that encodes your email address for easy document verification.

Add QR Code

QR Code Scanner

Scan or upload QR codes from our system to retrieve the original email address associated with the document.

Scan QR Code

Font Steganography - Encode NEW

Hide secret messages in PDF documents using subtle font size variations that are invisible to the naked eye but can be detected by analysis tools.

Encode Message

Font Steganography - Decode NEW

Extract hidden messages from PDF documents that use font steganography, revealing secrets embedded in font size variations.

Decode Message

How Our Tools Work

Invisible Watermarking

Our Invisible Watermarking feature embeds text in a color nearly invisible to the human eye, which can later be extracted using our special extraction tool. The watermark remains detectable even in screenshots or printouts of the document.

QR Code Embedding

The QR Code feature adds a small, unobtrusive QR code to the bottom-right corner of each page in your PDF document. This QR code contains an encoded version of your email address that can be scanned with any QR code reader or our specialized scanner tool to verify the document's source.

Font Steganography NEW

Our Font Steganography feature hides secret messages by using different font sizes for characters in cover text. Binary data is encoded using 7pt font for "0" bits and 10pt font for "1" bits. The variations are subtle enough to appear normal to casual observers but can be detected and decoded using our specialized tools. This method allows you to hide important information in plain sight within any text content.

Document Security

These tools help you track document sharing, identify the source of leaked documents, and provide accountability in document distribution. The variety of methods ensures you can choose the most appropriate steganographic technique for your specific security needs.