How to make a transparent signature PNG

You paste your signature into a contract and a white rectangle covers the signature line. That happens because the image has a background. The fix is a transparent PNG: the image format that keeps the ink and leaves the rest "empty", so the document stays visible underneath.

JPG doesn't support transparency: it always has a background, even if it's white. It also compresses lossily and leaves a grey halo around strokes. PNG keeps clean edges and the transparency channel, which is why it's the standard format for signatures.

At firmiu.com/en/create-signature you draw your signature with your finger or mouse and download it directly as a transparent PNG. There's no background to remove because it never had one. The image comes out cropped to the ink and in high resolution, so it doesn't look blurry when printed.

It also declares its resolution inside the file: inserted into Word it shows up at a real signature size (about 5 to 6 cm), instead of taking up half the page as many images do.

You can remove the background with an image editor: raise the contrast so the paper turns pure white, use the "remove background" or "magic wand" tool on the white, and export as PNG. Zoom in to check no grey specks remain on the edges.

If the result isn't convincing, it's usually faster to sign again on screen than to keep cleaning up a photo.

In Word: Insert → Pictures → choose the PNG. Then, under "Wrap Text", pick "In Front of Text" so you can move it freely onto the line. In a PDF, most readers let you add an image from their fill-and-sign tool.

A PNG of your signature is convenient, but it doesn't prove who signed: anyone who has it can paste it into another document. Keep it somewhere private and, for contracts that matter, use an electronic signature with an audit trail, which records IP, date, device and identity verification.