How to Convert PNG Images to PDF

The short answer

How to convert PNG to PDF, step by step

1. 1

   Capture the screenshots at a sensible size

   Screenshots taken at your display's native resolution stay readable. Screenshots scaled down before saving lose detail permanently, and nothing in the conversion can bring it back, so capture the full-size image and let the page setting do the fitting.

2. 2

   Add the PNG files to the tool

   Drop the images onto the PNG to PDF page, or click to browse. This page accepts PNG files; photographs saved as JPG go through the JPG to PDF tool, which is tuned for the same job with a different source format.

3. 3

   Set the sequence

   Drag the thumbnails into order. For a walkthrough or a bug report this is the whole value of the export: the reader follows the steps in the order they happened rather than guessing from file names.

4. 4

   Choose page size, orientation and margin

   Landscape suits full-screen captures from a desktop; portrait suits phone screenshots and tall diagrams. A small margin keeps the image clear of the page edge and stops content being clipped if the document is printed.

5. 5

   Convert and check the text is still readable

   Select Convert to PDF, open the download, and zoom to one hundred percent on a page with small text. If it reads cleanly there, it will read cleanly for everyone else.

Why PNG keeps screenshots sharp

PNG uses lossless compression. Every pixel that went in comes back out, which is exactly what a screenshot needs: hard edges between text and background, thin lines in a chart, and flat blocks of interface colour.

JPG compresses by discarding detail the eye is least likely to notice, which works well on photographs and badly on text. The result is a faint halo around every letter. Converting a PNG to PDF here embeds the image without re-compressing it, so none of that softening is introduced.

What happens to transparency

A PDF page is opaque. It has no equivalent of a transparent background, so any transparent region in a PNG is composited onto white at the moment the image is placed on the page. That is a property of the PDF format itself rather than a choice made by this tool, and every converter behaves the same way.

For screenshots this changes nothing, since they are rarely transparent. For logo artwork and exported design assets it matters: a white logo on a transparent background becomes a white logo on a white page. Export those assets with the background you want before converting.

Managing file size with large PNGs

Lossless compression is why PNG stays sharp and also why PNG files are large. A set of high-resolution captures can produce a PDF too big for an email attachment, and the conversion does not reduce that, because reducing it would mean discarding the detail you chose PNG to preserve.

If the finished document has to be smaller, run it through Compress PDF and check the result, or reconsider the source: a photograph that happens to be saved as PNG is usually better converted to JPG first, since photographs lose very little to that format.

Turning screenshots into a document people can follow

A bug report or a process walkthrough made of loose image files gets opened in whatever order the recipient's file manager chooses. As a PDF it has one order, one scroll, and one thing to attach.

If the sequence needs written explanation between the images, export the PDF here and then add text on the pages with Edit PDF. That keeps the images at full quality and puts the commentary exactly where each step needs it.

Common mistakes worth avoiding

• Scaling screenshots down before converting. The detail is lost at that point and the PDF cannot restore it.
• Expecting transparency to survive. PDF pages are opaque, so transparent areas end up white.
• Putting landscape desktop captures on portrait pages, which shrinks them until the interface text is unreadable.
• Converting photographs as PNG. They stay very large for no visible benefit; JPG to PDF suits them better.
• Sending the raw images alongside the PDF. Pick one, or the recipient will not know which is current.

Where your file goes

Frequently asked questions

Related reading

• How to Convert JPG Images to PDFPortals and forms accept PDFs, not photographs. This guide covers turning a set of phone photos into one tidy document with the pages in the right order.
• How to Convert PDF Pages to PNGPNG is the export format for pages that are mostly text or diagrams. This guide explains when that extra file size is worth paying and how to set the resolution.
• How to Edit a PDF OnlineMost PDF edits are additions: a signature, a date on a blank line, a circled clause. This guide covers those, and is honest about what is not included.
• Smallpdf alternativeSmallpdf is a polished toolkit with a strong free tier and a paid plan behind it. This is the version of the same everyday tasks with no tier at all, running on your own device.