PNG to PDF Converter

PNG is the format of screenshots, diagrams, charts and logos — images with sharp edges, flat colours and often a transparent background. This converter puts them into a PDF without any loss: the pixels are compressed losslessly inside the PDF and transparency is kept. If the PDF has to be small, switch on JPG conversion instead. Your images never leave the browser.

How to use this tool

1. Select one or more PNG files; pages follow the order you choose them in.
2. Choose A4, Letter or a page the same size as each image, plus orientation and margin.
3. Leave “Convert to JPG” off for full quality, or turn it on and pick a background colour and quality for a smaller file.
4. Download one combined PDF or one PDF per image.

Formula

Page size for “Same as the image” = pixels × 0.75 pt + 2 × margin. For A4 and Letter the image is scaled by k = min(box width ÷ image width, box height ÷ image height).

1 pt = 1/72 inch, so 0.75 pt per pixel equals 96 pixels per inch, the usual screen resolution. A 1920 × 1080 screenshot becomes a 1440 × 810 pt page (508 × 285.8 mm).

Example

A 1920 × 1080 px screenshot on landscape A4 with no margin is scaled by k = min(841.89 ÷ 1440, 595.28 ÷ 810) = 0.585, giving an image of 841.9 × 473.6 pt centred on the page with white bands above and below.

Lossless or JPG?

Lossless storage keeps text in screenshots perfectly crisp and is the right choice for diagrams, but photos saved as PNG make large PDFs. JPG conversion at 80–85% usually cuts such files by 70–90%; transparent areas are filled with the background colour you pick because JPEG has no transparency.