Step by step
- 01
PNG can keep the background transparent
A transparent PNG stores the ink and an alpha channel, so the page underneath remains visible around the handwriting.
- 02
JPG always has a rectangular image area
JPEG does not carry alpha transparency. A photographed signature therefore keeps a white, gray, or colored background unless another tool removes it first.
- 03
Thin lines favor lossless storage
PNG preserves exact pixel edges. Repeated JPEG compression can create halos and blocky artifacts that are especially visible around dark ink on a light page.
- 04
The PDF export matters too
A good source image can still look poor if it is enlarged far beyond its captured resolution. Place the signature at its intended size and inspect the final PDF before sending.
The short recommendation
- Choose transparent PNG for placing handwriting over a PDF.
- Keep a higher-resolution original and resize only when placing it.
- Use JPG for a full photograph, not an isolated signature asset.
Questions
Why does my JPG signature have a white box?
JPEG has no transparent alpha channel, so the photographed paper remains part of the rectangular image.
Is PNG always a smaller file?
No. PNG is often larger than JPEG for photographs, but signatures are simple line art and usually remain manageable.
Will converting JPG to PNG remove the background?
No. Changing the file format does not identify and remove the paper; background cleanup is a separate step.