Convert PNG images to PDF using pdf-lib.js. Supports transparent PNG files (transparency preserved in PDF). Choose page size, orientation, and margin. Batch up to 20 PNGs into a single multi-page PDF.
Click or drag up to 20 PNG images. Both transparent and opaque PNGs are supported. Thumbnails show the checkerboard pattern for transparent areas, which will render as white in most PDF viewers.
Choose output page size (A4, Letter, or Image Size), orientation, and margin. Optionally enable "White background" to flatten transparency to white before embedding — useful for logos and icons on a clean background.
Click Convert to PDF. pdf-lib embeds each PNG as a full page. Download the resulting PDF with all images in sequence. No watermarks, no quality loss.
pdf-lib embeds PNG files with their alpha channel intact. In PDF viewers, transparent areas typically appear as white since the PDF page background is white. If you enable "White background" in the settings, transparency is flattened to white before embedding, which produces a cleaner result in PDF viewers that handle alpha channels inconsistently.
PDFs are the standard for professional document sharing: they preserve layout across all devices, are printable at the correct size with proper margins, can contain multiple pages in one file, support digital signatures, and are accepted by most document management systems. PNG is ideal for images; PDF is ideal for documents.
PNG files are lossless and typically larger than JPGs. A full-page A4 PNG at 300 DPI is 15–30 MB. When embedded in PDF, the PNG data is stored losslessly, so PDF file sizes are similar to or larger than the source PNGs. If file size is important, convert the PNG to JPG first, then embed as JPG in the PDF.
A4: standard worldwide (210×297mm). Best for documents destined for European and international printing. Letter: standard in North America (215.9×279.4mm). Best for US printing. Image Size: the PDF page dimensions match the image pixel dimensions — best for pixel-perfect digital display without margins. For printing, choose A4 or Letter to ensure margins are correct.
Yes — each uploaded PNG becomes one page in the output PDF. The page order matches the upload order. Use Multi-Image to PDF if you need drag-to-reorder functionality.
Use the Multi-Image to PDF Converter for mixed JPG + PNG inputs. This PNG to PDF converter is optimised for PNG-only inputs with transparency handling. Multi-Image to PDF accepts both formats in any combination.
