PDF to PNG or JPG: Which Image Format Should You Choose?

Choose PNG when your PDF pages are mostly text, line art, charts or diagrams, or when you need a transparent background. Choose JPG when the pages are mostly photographs or scans and a small file matters more than perfectly crisp edges. Docmint's PDF to PNG tool exports lossless pages at 72 to 300 DPI, and PDF to JPG covers JPG with a quality slider, both entirely in your browser.

What is the real difference between PNG and JPG?

PNG is lossless. Every pixel the converter draws from your PDF page is stored exactly, so what you see in the image is precisely what was rendered. That is why the PDF to PNG tool has no quality slider: there is nothing to trade away.

JPG is lossy. It was designed for photographs, and it saves space by discarding detail the eye is unlikely to notice in natural images, such as tiny variations in color and texture. You control how much is discarded with a quality setting. The catch is that the same technique handles hard edges poorly, which is exactly what text and diagrams are made of.

Which format keeps text sharper?

PNG, every time. A page of black text on a white background is full of sharp transitions, and JPG compression tends to leave faint smudges and halos around letters, thin rules and table borders. At high quality settings the artifacts are hard to spot, but they become obvious when someone zooms in, or when the image is compressed again by a website or chat app.

If the image will be read, pasted into documentation, or used to show a contract clause or a chart, PNG keeps it clean. If the page is a photo spread or a brochure cover, the difference is usually invisible and JPG's smaller size wins.

Does transparency matter for PDF pages?

Sometimes. Many PDF pages, especially logos, icons and diagrams exported from design software, have no background color at all. In Docmint's PDF to PNG tool, those pages are exported with a transparent background when you enable the option, so you can drop the image onto a colored slide or a dark website without a white box around it.

JPG has no transparency. Any transparent area is filled with white. Keep in mind that transparency only appears where the page truly has no background: if the PDF paints a white rectangle behind the content, that white stays in the PNG too.

Which gives a smaller file?

JPG is usually much smaller, especially for photographic content. PNG files of text-only pages are often reasonable in size, but a PNG of a photo-heavy page can be several times larger than the equivalent JPG.

Resolution matters even more than format. Doubling the DPI doubles the width and height of the image, which means roughly four times as many pixels. For screens, slides and most web use, 150 DPI is a good default. Use 300 DPI only when the image will be printed or needs fine detail when zoomed.

Which format should you use for common jobs?

A quick rule of thumb for the situations people run into most:

1. Slides, documentation and help articles: PNG at 150 DPI, so text and diagrams stay crisp.
2. A logo or diagram that needs to sit on a colored background: PNG with transparency enabled.
3. Social media posts or previews of a brochure or photo-heavy report: JPG at 150 DPI.
4. Scanned documents: JPG. A scan is already a photograph of paper, so PNG adds size without adding sharpness.
5. Printing a page as an image: 300 DPI, PNG for text and line art, JPG for photos.

How to convert a PDF to PNG with Docmint

The conversion runs locally in your browser with JavaScript and WebAssembly, so the PDF is never uploaded.

1. Open the PDF to PNG tool and drop your PDF into it.
2. Pick the pages you need.
3. Choose a resolution between 72 and 300 DPI. 150 DPI is a sensible default for screens.
4. Enable the transparency option if you want pages with no background color to export with a transparent background.
5. Click Convert. A single page downloads as one image; several pages are bundled in a ZIP.

If you decide JPG is the better fit, the PDF to JPG tool works the same way and adds a format choice (JPG, PNG or WebP) and a quality slider. Around 85 is a good starting point for photos you plan to share online.

Other ways to turn PDF pages into images

For an occasional page, built-in tools are fine. On a Mac, Preview can export the current page as PNG or JPEG from the File menu. Full desktop PDF editors can export whole documents to images, and command-line tools such as pdftoppm from the Poppler project are handy if you convert files in scripts. A browser tool is mainly convenient when you want several pages at a chosen DPI without installing anything, on any operating system.

Common mistakes to avoid

1. Exporting at 300 DPI for a web page. The image will be large and the site will scale it down anyway.
2. Choosing PNG for scans or photos and then wondering why the ZIP is so big.
3. Expecting a transparent background from a page that has a white background drawn into it.
4. Converting a page to an image when you actually need the words. Images are not editable text; PDF to Text or OCR PDF is the better tool for that.
5. Saving a JPG, editing it and saving it again repeatedly. Each JPG save loses a little more detail.

Once you have your images, you can pass them to Convert Image to switch formats later, or to Compress Image if a PNG is heavier than a website allows.