Convert · Conversion guide

Convert PNG to PDF

PNG files are everywhere — screenshots, diagrams, design exports, scanned documents with transparency. When you need to share them as a PDF, OneClickPDF converts them without losing a pixel. Combine multiple PNG images into a single multi-page PDF, set your preferred page size, and download a clean document. The conversion runs in your browser with no server uploads.

Updated 15 October 20262 min read4 steps

On this page · 5 sections

Step-by-Step Guide

  1. Add your PNG files

    Drag and drop one or more PNG images onto the upload area, or click to browse. Select multiple files at once for batch conversion.

  2. Reorder and review

    Preview each image and drag-and-drop to arrange them in the order you want. Remove any images you don't need.

  3. Configure page settings

    Choose Fit to Image (each page takes its picture's size) or an A4, US Letter or US Legal portrait page with a margin of 0–200 pt. For screenshots, 'Fit to Image' usually gives the best result.

  4. Download your PDF

    Click convert to generate the PDF. Each PNG becomes a full page. Download the result — no watermarks, no quality loss.

Common Use Cases

  • Converting screenshots into a bug report or documentation PDF
  • Compiling design mockups or wireframes into a review document
  • Turning PNG charts and graphs from analytics tools into a report
  • Creating a PDF from PNG scans of hand-drawn artwork or notes
  • Assembling PNG diagrams from engineering or architecture software
  • Converting transparent PNG logos into a brand guidelines PDF

Technical Details

PNG images use lossless compression. OneClickPDF decodes each PNG and stores its pixels in the PDF with lossless (Flate) compression using pdf-lib, so every pixel is kept. For PNGs with alpha channels (transparency), the transparency is kept as a mask in the PDF. However, most PDF viewers render pages on a white background, so transparent areas will appear white when viewed. Because the pixels are compressed again, the PDF can be larger or smaller than the PNG files. On an A4, Letter or Legal page, large PNGs (e.g. 4K screenshots) are scaled down to fit while keeping their aspect ratio and every pixel; small ones are never enlarged.

Frequently Asked Questions

Is the PNG quality preserved in the PDF?
Yes. Every pixel is kept: the PNG is decoded and stored in the PDF with lossless compression, so nothing is lost or blurred.
What happens to transparent areas in my PNG?
Transparency is preserved in the PDF structure. However, most PDF viewers display pages on a white background, so transparent areas will appear white when viewing the PDF.
Can I combine PNGs and JPGs in the same PDF?
Yes. The Image to PDF tool takes JPG, PNG and WEBP images in the same conversion, one page per image.
How does the file size compare to the original PNGs?
It is usually close to the total size of your PNGs, but it can be somewhat larger or smaller, because the pixels are compressed again with the PDF's own lossless compression.
Is there a limit on the number of PNGs I can convert?
No limit set by OneClickPDF. The conversion runs locally in your browser, so you can convert as many images as your device's memory can handle.

PNG to PDF conversion is essential for anyone working with screenshots, diagrams, or design files. OneClickPDF keeps every pixel of your PNGs, keeps their transparency, and never uploads them. Fast, free, and private.

See how OneClickPDF compares to other PDF tools →

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