PDF to JPG: Choosing the Right Resolution (DPI) for Screen and Print

Updated October 13, 2026 · 3 min read

What DPI means when you turn PDF pages into images, how many pixels you actually need for screens, social media and printing, and how to avoid blurry or oversized files.

Turning a PDF page into a JPG image is easy. Getting an image that is sharp enough without being needlessly huge takes a little understanding of one number: DPI. This guide explains what it means, what values make sense for different uses, and how to pick the right setting in PDF to Image.

What DPI means for a PDF page

A PDF describes pages in physical units. An A4 page is 210 × 297 mm, a US Letter page is 8.5 × 11 inches. A JPG, on the other hand, is a grid of pixels with no physical size. To turn one into the other, the converter has to decide how many pixels to use for each inch of the page. That number is the DPI (dots per inch), sometimes called PPI.

The calculation is simple: pixels = page size in inches × DPI. An A4 page is about 8.27 × 11.69 inches, so:

The two settings in PDF to Image

Normal renders pages at about 108 DPI and saves them with moderate JPEG compression. For an A4 page you get an image a little under 900 pixels wide, which fills a phone screen perfectly and looks crisp in a chat, an email or a presentation slide. Files are small and conversion is fast, even for long documents.

High renders pages at 300 DPI with very light compression. This is the standard resolution for print. Use it when you will print the image, when the page contains small print such as footnotes or tables, or when you plan to run text recognition (OCR) on the image. Expect files several times larger and longer processing for documents with many pages.

How many pixels do you really need?

Think about where the image will be shown:

• Messaging apps and email: Most chat apps compress images to around 1200 to 1600 pixels on the long side anyway. Normal is enough.
• Social media: Feeds display images around 1080 pixels wide. Normal works for text pages; choose High if you want followers to be able to zoom into details.
• Presentations: A full-screen slide is usually 1920 × 1080. A page from Normal fits well as part of a slide; for a full-height page with small text, High is safer.
• Printing: Use High. 300 DPI is what print shops expect, and at lower resolutions text edges look soft on paper.
• Archiving or OCR: Use High. Text recognition software is much more accurate at 300 DPI.

Why more DPI isn't always better

Doubling the DPI quadruples the number of pixels. A 300 DPI image of a page has about eight times as many pixels as a 108 DPI one. That means bigger downloads, more memory use on phones and files that may be rejected by upload forms with size limits. If the PDF itself contains low-resolution images, such as a scan made at 150 DPI, rendering it at 300 DPI won't add any real detail; it just makes the file larger.

JPG compression and text

JPG is designed for photos. On pages of plain text, strong compression can produce faint smudges around letters. Both settings in PDF to Image use a quality level chosen to avoid visible artefacts at their resolution. If you need perfect text sharpness for print, High is the right choice; if you need the original images from the document rather than a picture of the whole page, use "Extract Images" instead. Our guide to JPG, PNG and PDF explains when each format is the best fit.

Quick recommendations

• Sharing a page on a phone or computer screen: Normal.
• Printing, small text, OCR: High (300 DPI).
• Need only a few pages: split them out first with Split PDF, then convert, to save time.
• Need the photos inside the document: Extract Images.

All rendering happens in your browser with PDF.js, so even confidential documents can be converted without being uploaded anywhere.