Convert PNG images to PDF documents online for free.
Why use this
PDF gives you four things a folder of PNGs can't: a single file instead of many, a defined page order, a fixed page size that prints predictably, and metadata (title, author, creation date) that survives forwarding.
Common use cases: emailing a sequence of UI screenshots so the recipient scrolls instead of opening attachments one-by-one, submitting a multi-page design proof for sign-off, archiving a chat-thread screenshot bundle…
PDF also handles transparency better than people expect: PDFWix flattens the alpha channel against a white background by default (with a toggle for keeping transparency), so logos and UI captures land in the document…
Native methods
On Mac. Select the PNGs in Finder, right-click → Quick Actions → Create PDF. macOS has had this built in since Mojave (2018) and it's genuinely good — single shortcut, multi-image support, no software to install.
On Windows. Open the first PNG in the Photos app, click Print, choose Microsoft Print to PDF, set 'Pictures per page' to 1, and click Print. This works one image at a time. For multiple PNGs in a single PDF, Windows has no first-party flow — you need a third-party tool, or…
On Linux. convert *.png out.pdf with ImageMagick installed does the job in one shell command and is the most flexible option if you're already comfortable on the terminal.
Frequently asked questions
Does the PDF stay lossless?
Yes if you keep transparency on (the PNG is embedded as a Flate-compressed image stream with no recompression). If you flatten transparency to white, PDFWix re-encodes the merged image with high-quality DEFLATE — visually identical to the source.
How does PDFWix handle PNG transparency?
By default it flattens against a white background, which prints and emails predictably. Toggle 'Preserve transparency' before converting if you need the alpha channel to survive (handy when overlaying the PDF on coloured slides).
Can I mix PNGs with JPGs and HEICs in one PDF?
Yes. Drop them all into the same dropzone — the tool detects each format and handles them appropriately. Output is a single combined PDF with consistent page sizing.