PNG files are common for screenshots, diagrams, signatures and graphics with transparency. Converting several PNGs into one PDF is straightforward, but page size, order and margins determine whether the final document is easy to read or print.
Put images in the correct order first
When multiple PNG files become one PDF, their sequence becomes the document page order. Arrange files before conversion and use previews rather than relying only on similar filenames.
Choose a page size for the destination
A4 and US Letter are useful for printing and standard documents. An image-sized page can be better for artwork or screenshots where you do not want a fixed paper shape around every image.
Think about transparency and backgrounds
Transparent PNG areas may appear differently depending on the PDF renderer and page background. If transparency is important, preview the result against the intended background before distribution.
Check legibility at normal zoom
A PDF can be technically valid while small interface text or diagrams become hard to read. Open the output, check a detailed image, and confirm the page order before deleting the original PNG files.
Worked example
Example workflow
Five phone screenshots need to become one handout. Put them in reading order, choose A4 portrait with a modest margin, create the PDF, then zoom in on the smallest text to confirm it remains readable.
Practical checklist
Before you finish
- Arrange PNG files before conversion.
- Use consistent margins for a document-style result.
- Choose image-sized pages for unusual aspect ratios.
- Keep source images until the PDF is checked.
Common mistakes
What to avoid
- Assuming alphabetical filenames match the desired page order.
- Using a fixed page orientation that crops or shrinks wide images too much.
- Ignoring transparent areas that change appearance.
- Deleting source PNGs before checking the PDF.