Add Signature to PDF

Place one visible signature image on a single page of a PDF.

Processing

The PDF and signature image are processed in browser memory; this workflow does not send them to a Stocknivo conversion endpoint. The PDF.js script may load from cdnjs for the page preview; its worker is served by this site. Those runtime requests are not document uploads. Rewriting a PDF may invalidate existing digital signatures, and this tool is not fully offline.

Loading visual-signature tool...

How it works

Choose one PDF, draw a signature or upload a PNG/JPEG image, select one page, adjust its placement, and download the updated PDF. Uploaded signature images are normalized to PNG.

Limits and signing scope

The PDF may be up to 50 MiB and 200 pages; output is limited to 100 MiB. The signature image may be up to 5 MiB, 4096 by 4096 pixels, and 16 million pixels total. It is placed on one physical page, which must have zero rotation. This adds a visible image only; it is not cryptographic or certificate-backed signing. Rewriting may invalidate existing digital signatures.

Related tool

To fill supported existing form fields instead, use Fill PDF Form.