DPI in plain words
DPI stands for dots per inch: how many tiny image dots fit along one inch of print. Imagine a row of tiles. With many small tiles per inch, the picture looks smooth and detailed. With few large tiles per inch, the same picture looks blocky and soft. That is all DPI means — dots per inch, and more dots means finer detail.
On a screen the same idea appears as pixels, but the principle is identical: detail comes from having enough dots to describe the letters and lines. A JPG of a PDF page is a grid of dots, and if the grid is too coarse for the size you view or print it at, edges look fuzzy.
The most common cause: a blurry source
In most cases the JPG is not the problem — the source PDF is. If the images inside the PDF are low resolution, or the pages were scanned at a low setting, or the text itself is small, the JPG copy faithfully reproduces that softness. Conversion is a photocopy, not a restoration: it copies what is there, including the blur.
A quick test: zoom into the original PDF. If the text already looks soft or pixelated when zoomed, the JPG will look the same or worse. If the PDF text stays crisp when zoomed but the JPG looks soft, the conversion quality is the limiting factor — see the next section.
What the tool can and cannot fix
PaperKit PDF to JPG renders every page at a fixed scale of 2, about 144 DPI, with no higher quality setting and no 300 DPI mode. That output is fine for viewing, slides and messages, but it will not sharpen a blurry source, and converting the same file again will give the same result.
What the tool cannot do, plainly stated: it cannot invent detail that the source lacks, it cannot turn a small image into a large sharp one, and it cannot rescue a scan that was blurry to begin with. Any guide or tool that promises to do so is overselling. The honest fixes are in the next section.
How to get a sharper result
- Check the original PDF first: zoom in and see whether the text is sharp there.
- Use the sharpest source you have: the original document, a fresh scan, or a higher-resolution export.
- Keep the PDF itself for printing and official use, and use the JPG only for viewing, slides and messages.
- View and print the JPG at its natural size instead of enlarging it, which only stretches the same dots.
If the PDF came from a scan, rescanning the page cleanly — flat on the scanner, in bright even light, with the whole page in frame — usually helps more than any setting. If the PDF came from a website or a message, ask the sender for the original file rather than a forwarded copy, which may have been compressed along the way.
Small text, diagrams and handwriting
Small text suffers first, because a letter only a few dots tall has little detail to show. Diagrams with thin lines and handwriting with light strokes suffer next. For those pages, the PDF itself is almost always the better format to send: the recipient can zoom into real text or a high-resolution page instead of squinting at a picture of it. If you must send a JPG, crop it to the important section so that section appears larger, rather than shrinking a whole page into a small image.
Password-protected PDFs
Password-protected PDFs must be unlocked first in the application that created them. No PaperKit tool bypasses a password. Once the restriction is removed, the file converts like any other PDF.
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