A transparent PNG from a PDF: logos, stamps and signatures

Both steps run on your device; nothing is uploaded.

What transparency needs

2 things, and both are easy to check:

1. A PNG. JPG cannot hold transparency, so a JPG of the same page always has a white background. PDF to PNG has a Background switch: white or transparent.
2. A source with nothing painted behind the object. In most PDFs made by software (Word, a design app, an e-signing service) the page itself is empty and only the text and shapes are painted, so the background comes out clear. A scanned page is 1 picture that includes the paper, and the paper is painted, so it stays.

The quick test: select text near your logo in a PDF viewer. If you can, the page is drawn by software and this guide works as is. If nothing selects and the whole page highlights as 1 picture, it is a scan; jump to the scanned case below.

Steps: the stamp from the lease, as a transparent PNG

Our test page is an invented lease: 44 lines of text with a round red “RECEIVED” stamp in the bottom right corner, all vector. The job is the stamp alone, on a clear background, for a slide.

1. Find where the object sits. In millimetres from each edge of the page. Our stamp’s square starts 141 mm from the left edge and ends 27 mm from the right, 237 mm below the top and 18 mm above the bottom. A ruler on a printout or the measuring tool in your PDF viewer both do; it does not need to be exact, a few millimetres of margin are fine.
2. Crop the page to it. Open Crop PDF, choose By margins, and type the 4 numbers into Top, Right, Bottom and Left. Press Crop and download. If the page holds nothing but the logo (a logo PDF from a designer, say), use Trim white margins instead; it finds the object by itself.
3. Render it as a transparent PNG. Drop the cropped PDF into PDF to PNG above. Set Resolution to 300, switch Background to transparent, and press Make the images.
4. Check it on dark. Place the PNG on a dark slide or a dark web page. A clean result shows only the stamp, no white box, no grey halo.

What came out on 11 October 2026:

Resolution	Pixels	File size	See-through pixels
150 dpi	248 x 248	13 KB	86 %
300 dpi	496 x 496	28 KB	88 %
600 dpi	992 x 992	61 KB	89 %

Small crops are cheap, so the resolution choice is easy: 300 dpi for a slide or a document, 600 dpi for print. The edges of the stamp are softened by a pixel of partial transparency, which is what keeps them smooth over any background.

Signatures drawn in the PDF

A signature added with an e-signing service or a PDF editor is often a vector drawing or a small picture with its own transparency, on an otherwise empty background. Crop to it and render it exactly like the stamp. The result keeps the ink colour and smooth strokes; at 300 dpi a 60 mm wide signature is about 700 px wide, plenty for a document or an email footer.

Before you reuse a signature, think about where it goes. A picture of a signature pasted into a document is not a digital signature and proves nothing about who placed it. To sign a PDF properly, see sign and fill a PDF.

The scanned case: the paper comes along

A logo or signature on a scanned page is part of 1 picture that includes the paper. The renderer cannot tell ink from paper; it draws the picture as it is. We checked: our 200 dpi scanned test page rendered with a transparent background has not a single see-through pixel.

What works instead:

1. Crop the scanned page to the signature or stamp with Crop PDF, as above.
2. Render it as PNG at the scan’s own resolution (150 or 300 dpi; higher only enlarges the scan’s pixels).
3. Remove the paper from the image with a background remover. Our sister tool getPNG does that in the browser as well, with nothing uploaded.

If you need the scanned picture itself rather than a render of the page, Extract images gives you the stored scan untouched; the paper is still in it.

The honest part

• What is painted stays. If the PDF draws a white rectangle behind its content (some exporters do, for the whole page), that rectangle is content, and it comes out white and opaque. Crop inside it, or accept the white.
• White details vanish on white. White text inside a logo or a thin light outline is kept in the PNG, but over a white slide it is invisible, and over a dark one a pale halo can show. Look at the result on both before you ship it.
• The crop hides, it does not delete. Crop PDF changes what the page shows; the rest of the page is still in the cropped PDF. That does not matter for the PNG, which contains only what was rendered, but do not send the cropped PDF on thinking the rest is gone. To remove content for good, use Redact PDF.
• The PNG is a copy. Keep the original PDF; a vector logo there is sharp at any size, while the PNG is fixed at the DPI you chose. A PDF to SVG converter that would keep vector art as vectors is planned for getPDF, not available yet.

For which format suits which job, see PDF to JPG or PNG; the pillar is PDF to images.