PNG or JPG to PDF: Which Image Type Should You Use?

Most of the time you do not choose the image format. A phone camera saves a JPG, a screenshot saves a PNG, and the file you have is the file you convert. But sometimes you do have a choice, such as when you export a graphic, scan a page, or save a chart. In those cases the format affects how sharp the PDF looks and how big it gets.

Because the formats are handled by separate tools, it also tells you where to go: the JPG to PDF tool for JPG and JPEG files, and the PNG to PDF tool for PNG files.

The short answer

• Choose JPG for photographs and scans of photos, where small files matter.
• Choose PNG for screenshots, charts, diagrams, logos, and pages with fine text.
• If you already have the files, use whichever tool matches their type.

How they differ

JPG shrinks a picture by discarding detail the eye barely notices. That works beautifully for photos, but it can leave a faint haze around thin lines and small text. PNG keeps every pixel exactly, which is why it suits screenshots, interface captures, and charts, at the cost of a bigger file.

What happens inside the PDF

The PDF is only a container. A sharp PNG stays sharp in the PDF, and a soft JPG stays soft. Converting does not improve the picture, so start with the best image you can get. The finished file size also follows the image: a PDF made of PNG screenshots is usually larger than one made of JPG photos of the same page count.

Choosing by situation

**Phone photos of paper documents.** These are almost always JPG. Use JPG to PDF. For better results, read our phone scan workflow.

**Screenshots of chats, settings, or web pages.** These are usually PNG. Use PNG to PDF. The screenshots guide has the details.

**Charts and diagrams exported from software.** Export as PNG if you can, because thin lines stay clean. Use PNG to PDF.

**Scans from a scanner.** Many scanners offer both. Choose JPG for photos and mixed pages, and PNG for black-and-white text pages if file size is not a concern.

**Logos and graphics with transparent areas.** Only PNG supports transparency. In the PDF those areas show the page colour, which is normally white.

Mixed batches

A single run handles one image type. If you have both JPG and PNG files, there are two good routes:

• Make one PDF from each group and join them with the merge PDF tool, after putting the files in the order you want.
• Use the Insert PDF Pages tool, which accepts both types and lets you place images at a chosen position inside an existing PDF.

Changing formats

The site does not convert one image format into another. If you have a PNG that is huge and you want a JPG, re-save it in an image editor or your phone's photo app first. If you have a JPG that you want to keep sharp, make sure you keep the original rather than saving it again and again, since each save can lose a little more detail.

Page size

Both tools offer the same page options: fit to image, A4, or US Letter. Choose A4 or US Letter for anything that will be printed or uploaded to an official portal. Our complete guide to JPG to PDF explains each option in detail.

Going the other way

If you later need a page from a PDF as a picture, PDF to JPG and PDF to PNG cover both formats. The comparison in PDF to PNG or JPG applies in the same way.

Privacy

Both converters run in your browser, so your images stay on your own device.

Frequently asked questions

Which gives a smaller PDF?

JPG usually does, especially for photographs.

Which looks sharper?

PNG for text, screenshots, and line art. For photos the difference is hard to see.

Can I mix both in one run?

No. Convert each type with its own tool and merge the PDFs, or use Insert PDF Pages, which accepts both.

Does converting reduce quality?

The conversion itself does not. The PDF contains your image as it is.

Match the format to the content, open the matching tool, and the PDF will look as good as the images you started with.