How it works
- Load a PDF and choose a page thumbnail.
- Select a focused tool, configure its text, image or colour, and tap the page to place it.
- Drag placed elements and resize the selected item when needed.
- Apply the overlays and download a new PDF.
Practical example
Add a short correction on page 2, highlight a sentence on page 4 and place a logo on the final page without flattening every original page into an image.
Formula and explanation
This is a practical overlay editor rather than an attempt to reproduce a full desktop publishing suite. Existing PDF content stays in the document and Cifrivo adds new drawing operations at the coordinates you choose.
Text uses an embedded standard PDF font. Images and signatures are embedded once and can be placed on different pages. Highlights use translucent rectangles, while freehand strokes become PDF lines. The preview is a local rendering and the final coordinates are translated back to each page's real size.
Encrypted or malformed documents may not open. Complex interactive forms, existing paragraph reflow and certified digital-signature fields are outside this version. PDF.js is loaded only for PDF previews and pdf-lib only when the PDF workflow needs it.