How to Convert PDF to JPG — One Page, One Image, the Right DPI

A PDF is not an image — it is a container that holds text, shapes, fonts, and embedded images across multiple pages. When you "convert PDF to JPG," what you are actually doing is rendering each page as a raster image at a specific resolution. A 10-page PDF produces 10 separate JPG files.

The key decision is resolution (DPI). PDF pages can render at any DPI because their content is vector-based — text and shapes are mathematical descriptions, not fixed pixels. Choose 72 DPI and the images look fine on screen but blurry when printed. Choose 300 DPI and the images are print-ready but large in file size. This guide explains how to pick the right DPI and walks through every method from browser tools to command-line utilities.

Why PDFs Render at Any Resolution (and Why DPI Matters)

Most PDF pages contain vector content: text rendered from embedded fonts, lines, shapes, and curves described as paths. This is the same idea as SVG — the PDF specification stores mathematical descriptions of content, not fixed pixels. A PDF page can be rendered at 72 DPI for a small screen preview or at 1200 DPI for a high-quality print proof, and the text and shapes will always be crisp and sharp at the render resolution.

When you render a PDF page to JPG, the renderer (PDF.js, Ghostscript, poppler) draws each element at the specified DPI, then JPEG-compresses the resulting pixel grid. The rendering is always clean — what matters is whether the pixel count is high enough for your intended use.

Note: if the PDF contains embedded raster images (photos scanned in), those images have a fixed resolution. Rendering at 300 DPI will not make a 72-DPI scanned image clearer — the scan is the bottleneck, not the PDF rendering.

DPI Guide — What to Use for Each Use Case

Method 1: Convertlo — PDF.js Browser Tool, Private

Method 2: Ghostscript CLI — Batch, High DPI

# Convert all pages at 150 DPI (email-quality)
gs -dNOPAUSE -dBATCH -sDEVICE=jpeg -r150 \
   -dJPEGQ=85 -sOutputFile=page-%03d.jpg input.pdf

# Convert at 300 DPI (print-quality)
gs -dNOPAUSE -dBATCH -sDEVICE=jpeg -r300 \
   -dJPEGQ=90 -sOutputFile=page-%03d.jpg input.pdf

# Convert single page (page 3) at 300 DPI
gs -dNOPAUSE -dBATCH -sDEVICE=jpeg -r300 \
   -dFirstPage=3 -dLastPage=3 \
   -sOutputFile=page-3.jpg input.pdf

# Convert to PNG instead (better for text pages)
gs -dNOPAUSE -dBATCH -sDEVICE=png16m -r300 \
   -sOutputFile=page-%03d.png input.pdf

The -dJPEGQ flag sets the JPG quality (0–100). Use 85–90 for a good balance. The %03d in the output filename creates zero-padded page numbers: page-001.jpg, page-002.jpg, etc. — useful for keeping pages in sorted order when you have more than 9 pages.

Method 3: poppler-utils — pdftoppm for Linux/macOS

# Convert to JPG at 150 DPI
pdftoppm -jpeg -r 150 input.pdf page

# Convert to JPG at 300 DPI with quality 90
pdftoppm -jpeg -jpegopt quality=90 -r 300 input.pdf page

# Convert to PNG at 300 DPI (for text-heavy pages)
pdftoppm -png -r 300 input.pdf page

# Extract only pages 2-5
pdftoppm -jpeg -r 150 -f 2 -l 5 input.pdf page

JPG vs PNG for PDF Pages — When to Use Each

Most people default to JPG because it is smaller, but PNG is often the better choice for text-heavy PDFs:

Frequently Asked Questions