The service applies a mark of your choice to all pages of a document and generates a separate verification passport. In visible mode, this is a graphic sign drawn by you. In hidden mode, these are subtle cuts in letter strokes, with a precise map of changes in the passport.
When this is useful
You are sending a draft contract in PDF to several departments for approval and want to visually distinguish the printed versions. By drawing a unique sign for each department, you can quickly identify the source of a copy. Or you store a passport scan as a JPG and want to covertly mark the copy, so you know which specific file was compromised in case of a leak.
Step-by-step instructions
- Upload a file in a supported format, such as PDF or an image.
- Choose the mode: a visible mark to draw a sign with the mouse, or a hidden one by specifying a 5-8 letter word.
- Start the processing.
- Once complete, download the archive containing the marked document and the passport file for verification.
How to verify the result
Open the resulting document and ensure the mark is present on every page in the expected location. For hidden mode, open the passport and visually compare the 'before/after' maps to understand the placement of cuts. Check if the quality of text or images has critically degraded after processing.
Important limitations
The marks are not a technical copy protection, do not confirm authorship, and do not replace an electronic signature. Hidden mode converts all pages into raster images, making text search and selection impossible. The preservation of cuts during printing and scanning depends on device resolution, so a trial cycle is recommended.