It works for me. Please read this:
https://pdfbox.apache.org/3.0/faq.html#what-fonts-do-i-need-on-my-system%3F
and install ZapfDingbats or another appropriate font as mentioned there.
Btw your code is for PDFBox 2.0, but you mention 3.0.7.
Tilman
On 2026/06/12 08:52:01 杨喆 wrote:
> Dear PDFBox developers,
>
> Please find below a bug report regarding PDF to PNG conversion.
> Describe the bug
>
>
> When converting a PDF document to PNG images, checkboxes are displayed as
> empty squares (□) and the checkmarks inside checked checkboxes are not shown.
> The original PDF contains properly rendered checkmarks (e.g., ☑) or filled
> checkboxes, but after conversion, they all appear as empty squares.
>
>
>
>
> Sample Code
>
>
> PDDocument document = PDDocument.load(new File("sample.pdf")); PDFRenderer
> renderer = new PDFRenderer(document); BufferedImage image =
> renderer.renderImage(0, 2.0f); ImageIO.write(image, "PNG", new
> File("output.png"));
>
>
> Expected behavior
>
>
> Checked checkboxes should be rendered as filled squares or squares containing
> a checkmark (e.g., ☑). Unchecked checkboxes may remain as empty squares (□).
> The visual state should match what is seen when opening the PDF in Adobe
> Acrobat or a standard PDF viewer.
>
>
> - OS: window10
> - version:3.0.7
>
>
>
> Attached files:
>
>
> Problem document (copy.pdf)
>
>
>
> Screenshots (copy.png)
>
>
>
>
>
> 杨喆
> [email protected]
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