How to add a transparent signature PNG to a PDF

Prepare a clean image, place it through Acrobat, and decide when the recipient needs a certificate-based electronic signature instead.

Image signature or certificate signature?

A transparent PNG is a picture of handwriting. A certificate-based signature uses a digital identity and may provide tamper evidence; background removal does not create one.

1. Create the transparent signature PNG

Use a clear photo or scan, compare the edge on light and dark previews, and repair only strokes confirmed by the source.

2. Add the image with Acrobat Fill & Sign

Open the PDF, choose E-Sign → Fill & Sign → Add signature, select the image option, and place the authorized PNG in the intended field.

3. Check the PDF before sending it

Resize from a corner, read the ink against the form, save a separate final copy, and follow the recipient’s required signing process.

Create a transparent signature