PDF to JPG: Choosing the Right DPI (72, 150, or 300)
A 72 DPI screenshot of a PDF page looks crisp on your laptop and pixelated on a high-DPI monitor. Here's how to pick the right resolution.
When converting a PDF to JPG, the DPI setting controls how detailed (and how large) the output image is. Three options usually offered, three different use cases.
What DPI actually means
DPI = "dots per inch." A 72 DPI image of a US Letter page (8.5 × 11 inches) is 612 × 792 pixels. At 300 DPI, the same page becomes 2550 × 3300 pixels — 4× more pixels per dimension, 16× more total data.
More pixels means sharper detail and larger files. The right DPI depends on where the image will be viewed.
72 DPI: screen-only use
- Use for: thumbnails, web previews, social media posts
- Output size: tiny (~50–100 KB per page)
- Quality: sharp on standard monitors, fuzzy on Retina/4K
72 DPI is the historical screen resolution. On a modern Retina laptop it'll look slightly soft when zoomed to full size, but for thumbnails and previews it's fine.
150 DPI: general-purpose
- Use for: email attachments, presentations, casual sharing
- Output size: medium (~300–500 KB per page)
- Quality: sharp at fit-to-screen, slight softness at 200% zoom
The right default for most cases. Big enough to look good on modern screens, small enough to email comfortably.
300 DPI: print quality
- Use for: physical printing, professional designs, high-quality archives
- Output size: large (~1–3 MB per page)
- Quality: indistinguishable from print
300 DPI is the print industry standard. If the image will go to a printer or be used in a Photoshop/Illustrator design, use 300. Otherwise 150 is plenty.
Pick the format too
SwitchPDF PDF to JPG also lets you pick PNG output. Quick guide:
- JPG: smaller files, slightly lossy compression. Best for photo-heavy pages.
- PNG: larger files, lossless. Best for text-heavy pages — sharper text at all zoom levels.
For a slide deck with mostly screenshots, JPG. For a text document, PNG.
Multi-page PDFs
Each page becomes a separate image file. SwitchPDF packages them in a ZIP with names like pdf-page-1.jpg, pdf-page-2.jpg. Extract the ZIP and you have one image per page.
Realistic file sizes
A 10-page PDF, 8.5 × 11":
| DPI | Format | Total ZIP size |
|---|---|---|
| 72 | JPG | ~500 KB |
| 150 | JPG | ~3 MB |
| 150 | PNG | ~5 MB |
| 300 | JPG | ~15 MB |
| 300 | PNG | ~25 MB |
Bottom line
Screen-only sharing: 72 DPI JPG. General use: 150 DPI JPG. Print or pro design: 300 DPI. PNG over JPG when text crispness matters.
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