Redact black & white PNG image in Paint 3D, saved file is 250% bigger

[FrankyMacky]

I scanned a document page in 200 dpi Black and White, then saved it as PNG. It was 120KB. I used Paint 3D to draw a few small black rectangles over personal details, then saved it as PNG. The result was 280KB. I did not have the options of specifying black and white.Is there another way to perform simple redaction on a PNG image without grossly inflating the size of the file?

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