PNG input has a specific PDF limitation
Although PNG itself can be lossless and transparent, this PDF engine does not embed the original PNG stream. It draws each image on white, applies rotation or flipping, re-encodes it as 95% JPEG, and places that result on a PDF page.
When the workflow fits
Combine opaque screenshots, diagrams, scanned pages, or exported slides into a printable document. Choose A4 or Letter for consistent paper pages, or Original to follow each transformed image’s pixel dimensions.
Before converting transparency
Preview a transparent logo or illustration against white. If it needs another background, flatten it deliberately with Image Converter before building the PDF.
Troubleshooting layout and memory
Use Fit when Fill clips screenshot edges. Increase margins for printable whitespace. Large batches of high-resolution PNGs expand substantially when decoded, so reduce dimensions or divide the document if a mobile browser runs out of memory.
PNG-to-PDF questions
What happens to PNG transparency?
The shared PDF engine paints a white background and converts every source to JPEG before embedding it, so transparent pixels become white.
Is the PNG stored losslessly inside the PDF?
No. The current implementation re-encodes each page image as JPEG at 95% quality.
Can I change the PNG page order?
Yes. Arrange the selected files before creating the PDF; one image becomes one page.
Why do transparent graphics look different?
Semi-transparent and transparent pixels are composited against white. Flatten the image onto the intended background before conversion if white is unsuitable.
Are PNG files uploaded?
No. The browser performs the pixel transformation and PDF creation locally.