Transparent PNG: the signature format that disappears into the page.

PNG vs JPG for signatures, in one paragraph

JPG has no transparency: photograph or export a signature as JPG and the "empty" paper becomes part of the image, usually an off-white rectangle that clashes with the document behind it. PNG stores an alpha channel, so the empty area is genuinely empty. The cost is file size — which is why the generator has a KB cap for portals, and why forms that demand white backgrounds and JPG are a separate case handled in the exam guide.

Placing it in a PDF

1. Open the PDF in a reader/editor with a stamp or image tool (most free readers include "Add image" or a stamp feature under comments/signing).
2. Insert the PNG, drag it onto the signature line, and resize from a corner so the proportions stay natural.
3. Size it to the line, not the page: on an A4 document a signature is typically 35–50 mm wide.
4. If the editor offers "flatten" when saving, use it for the final copy so the image cannot be lifted off the page as easily — and keep the unflattened original for yourself.

Placing it in Word or Google Docs

1. Insert → Image → upload the PNG.
2. Set text wrapping to "In front of text" (Word) or "Break text / free positioning" (Docs) so you can nudge it exactly onto the line.
3. Drag a corner handle to scale; hold Shift if your version needs it to lock proportions.
4. Export to PDF for sending, so fonts and placement cannot shift on the recipient's machine.

Two honest cautions

First, an inserted signature image is decoration-grade signing: anyone with the file can reuse the picture, so never share the PNG itself, and do not use image-signing where a certified e-signature is required. Second, transparency cuts both ways — on a dark or patterned background, dark ink can become unreadable. Preview the final document the way the recipient will see it.