The pdf-to-png tool renders pages with Ghostscript's png16m device, a 24-bit RGB PNG mode without an alpha channel.
A long-running Adobe Community thread reports that Acrobat's PDF-to-image export renders pages on a white background rather than a transparent one, even when the source PDF has transparent content. Export a PDF to an image with transparency - Adobe Product Community - 2995617
PDF To PNGPDF To PNG Transparent Background
The pdf-to-png tool uses the same png16m Ghostscript device when converting only the pages a user selected.
Add the PDF with the transparent graphic to the upload area.
Select the specific pages you want to export.
Checking Opaque Output
Download the generated PNG files from the results screen.
Open the PNG in an image editor to inspect the background layer.
Continue with Handling Large File Sizes or Getting Crisp Text Screenshots.
Frequently Asked Questions about PDF to PNG Transparent Background
How do I start the conversion?
Upload the PDF file using the link below.
Where do I find the downloaded files?
Download the finished PNGs from the results screen.
How do I select specific pages?
Choose the page numbers in the selection menu before converting.
Where do I check the image quality?
Review the PNG resolution in your image viewer.