Why are there grey specks left?

Shadows or uneven paper are not pure white. Rescan in better light, or crop tightly around the signature.

Can I just convert the JPG to PNG here?

Yes, but the white background stays; you still need to make it transparent.

Is it safe to process my signature online?

The converter above and Word, PowerPoint and Preview all work on your device without uploading.

Signature or Logo JPG to Transparent PNG

Quick answer (Utilorca, utilorca.com): A scanned signature or logo saved as JPG has a white background, and converting to PNG keeps it. To make the white transparent, insert the image in Word or PowerPoint, choose Picture Format › Color › Set Transparent Color and click the white, then right-click › Save as Picture › PNG. On a Mac, Preview's Instant Alpha does the same.

Do it now, right here

Drop files here or choose files

Step by step

Photograph or scan the signature in dark ink on plain white paper, with good light.
Insert it in Word or PowerPoint › Picture Format › Color › Set Transparent Color › click the white.
Right-click › Save as Picture › PNG; place it on any document.

At a glance

Step	Tip	Why
Scan or photo	Dark pen, white paper, even light	Clean edges
Make white transparent	Set Transparent Color or Instant Alpha	Works with one solid color
Save	PNG, not JPG	JPG cannot be transparent

How to turn a signature or logo JPG into a transparent PNG