How to Convert PDF to JPG
A teacher friend once sent me a screenshot of a PDF that looked like it had been photographed through a jam jar. "This is what the conversion tool gave me," she said. She'd converted at 72 DPI, which is the resolution of a 1990s fax machine.
PDF-to-JPG conversion is one of those things where a single setting — DPI — makes the entire difference between "sharp and usable" and "why bother". Here's what to know.
What's in this guide
Why convert PDF to JPG?
PDF is the right format when you need pages. JPG is the right format when you need an image. Situations where JPG wins:
- WhatsApp and some messaging apps handle images more gracefully than PDFs
- Slide decks or social posts need images, not PDFs
- You need to embed one page of a PDF into another document
- You're uploading to a system that accepts images but not PDFs
- You want to preview what the PDF page looks like without opening a PDF reader
The reverse situation — you need a multi-page document with consistent page structure — is where PDF wins. So if you're converting a 20-page report to JPGs, ask yourself: do you actually want 20 images?
Understanding DPI
DPI stands for "dots per inch" — how many pixels the renderer produces for each inch of the page. PDF pages are defined in points (1/72 inch), and the conversion multiplies by DPI to get pixel dimensions.
Here's what the same A4 page produces at different DPIs:
| DPI | Pixel size (A4 portrait) | Use case |
|---|---|---|
| 72 | 595 × 842 | Quick previews — text is barely readable |
| 150 | 1240 × 1754 | Screen reading, embedding, most documents |
| 300 | 2480 × 3508 | Printing, archiving, high-quality sharing |
| 600 | 4960 × 7016 | Rarely needed; enormous files |
At 72 DPI, a body-text line of 11pt type renders as roughly 11 pixels tall. That's barely legible. At 150 DPI it's comfortable. At 300 DPI it's crisp on retina displays and fine for print.
Rule of thumb: if you're going to display the result on a screen, 150 DPI is right. If you might print it, 300. If you're just checking what the page looks like, 72 is fine.
JPEG quality vs DPI
These two settings get confused constantly, but they control different things.
- DPI controls the dimensions of the output image (pixels per inch of page).
- JPEG quality controls the compression within those dimensions (how aggressively the encoder throws away data).
A 300 DPI image at quality 30% could easily be smaller than a 150 DPI image at quality 95% — but visually the 300 DPI one will look softer and blockier where the compression kicked in.
For most documents: 150 DPI at quality 85% is a sweet spot. You get a clean image under 1 MB per page.
For scanned or photographic pages: 150–200 DPI at quality 90% preserves visual detail well.
For text-heavy documents you'll read on screen: 150 DPI at quality 85% is fine — JPEG compression artefacts around text are barely visible at this quality.
Common workflows
The teacher sharing a page with a class
She needs page 7 of a 40-page PDF as a single image she can paste into a slideshow. Workflow: convert at 150 DPI, quality 90%. Result: a 1200×1700 JPEG that's readable on any projector.
The freelancer sending a receipt
She needs a small, clean image of a single receipt PDF to upload to an expense system. Workflow: 150 DPI, quality 85%. Result: a 200 KB JPG that opens instantly.
The author archiving a manuscript
He wants each page as an image for a personal website. Workflow: 300 DPI, quality 90%. Result: 1.5 MB per page, suitable for retina displays and printing.
The student screenshotting an equation
She needs a specific formula from a PDF to paste into her notes app. Workflow: 200 DPI, quality 95%. Result: crisp equation image that doesn't look pixelated when she zooms.
Pitfalls
1. Everything comes out too small
If every image looks tiny, you're probably at 72 DPI. Bump to 150 or 300.
2. Everything is huge
At 300 DPI with quality 95%, an A4 page produces a 2-3 MB JPG. Multiply by 20 pages and you have a 50 MB ZIP. That's often more than needed. For most web/screen uses, 150 DPI at 85% is enough.
3. Text looks slightly fuzzy
JPEG compression creates artefacts around text. At lower qualities, these become visible as grey halos around letters. Fix: raise JPEG quality to 90% or above for text-heavy pages.
4. Transparent regions turn black
Some PDFs have transparent backgrounds. If the conversion renders onto a transparent canvas and then encodes as JPEG (which doesn't support transparency), the transparent area becomes black. Our PDF to JPG tool fills white before rendering to avoid this — but if you use a different tool and see black backgrounds, that's why.
5. Multi-page files produce a ZIP, not a single image
If your PDF has 20 pages, converting to JPG gives you 20 files. You can't fit 20 images into one JPG. This surprises people who expected a single output. It's not a bug — it's geometry.
FAQ
What DPI should I use?
72 for previews, 150 for screen, 300 for print. Start at 150 and adjust based on whether the result looks good.
How many images do I get?
One per page, all bundled into a ZIP. A 20-page PDF produces 20 JPGs.
Can I convert just one page?
Not in our current tool — we convert the whole document. If you only need a specific page, split it out first with Split PDF, then convert.
Can I get PNG instead of JPG?
Not from this tool. JPG is smaller and adequate for most uses. If you need PNG (for transparency or lossless quality), convert the JPG afterward in an image editor.
Is there a page limit?
No hard limit. But 300 DPI on a 200-page PDF can exhaust memory on older devices. Convert in batches if needed.