You need a PDF page as an image — for a social post, a slide, an upload slot that only takes JPG, or a printed poster. You convert it with some tool and the result is blurry when zoomed, needlessly huge, or has a strange black background.
The quality of the output comes down to just two decisions: format (JPG or PNG) and resolution (how many pixels per inch). This guide explains both simply and gives you the right setting for each use.
- JPG for photo-heavy pages and scans (smaller). PNG for text, tables and diagrams (perfectly crisp).
- 144 DPI for screens and sharing, 200 DPI for comfortable reading, 300 DPI for print.
- Use PDF to JPG or PDF to PNG and pick the resolution from the menu.
- One page gives a single image; multiple pages come in a ZIP.
- A higher setting can't improve a page that was a low-resolution scan to begin with.
How a PDF becomes an image
A PDF page isn't necessarily an image; usually it's drawing instructions — "write this text in this font here, draw this line, place this picture there." Those instructions are vector, so they scale infinitely without losing sharpness.
Converting to an image executes those instructions onto a grid of a fixed number of pixels — a process called rasterization. The resolution setting decides how many pixels. Once rasterized, the page is a fixed image: zoom beyond its resolution and it blurs, because the extra detail was never drawn.
That's why resolution is chosen before converting, not after.
Resolution: what 144, 200 and 300 DPI mean
One PDF point equals 1/72 inch. At 144 DPI, every inch of the page becomes 144 pixels. For an A4 page:
| DPI | A4 page in pixels | Best for |
|---|---|---|
| 144 | ~1190 × 1684 | Screens, chat and social sharing, slides |
| 200 | ~1654 × 2339 | Comfortable zoomed reading, document uploads |
| 300 | ~2480 × 3508 | Good-quality printing, archiving as images |
(US Letter pages come out slightly wider and shorter: about 1224 × 1584 at 144 DPI.)
Simple rule: 144 for screens, 300 for print. Beyond 300 rarely helps documents and multiplies file size.
Why not always choose 300 "just in case"? A 300 DPI image has about 4.3 times the pixels of a 144 DPI one — bigger files, slower conversion and heavier opening on phones, with no visible benefit on screen.
JPG or PNG?
| Factor | JPG | PNG |
|---|---|---|
| Compression | Lossy — drops fine detail | Lossless — every pixel as-is |
| Text and thin lines | May show faint halos | Perfectly sharp |
| Photos | Excellent and small | Very large |
| Size of a text page | Small | Medium |
| Size of an image-heavy page | Small | Very large |
| Acceptance on sites and portals | Widest | Wide |
Choose JPG when the page is a photo or scan, when size matters, or when a portal specifically asks for JPG.
Choose PNG for text, tables, charts and diagrams, or when you need full sharpness for later editing — e.g. cropping a table into a slide.
WPPR's JPG output uses high quality (about 92%), so loss is practically invisible on most pages. For more on formats, see JPG vs PNG vs WebP.
How to convert
- Open PDF to JPG or PDF to PNG.
- Choose the PDF — processed in your browser, never uploaded.
- Choose Resolution: 144 for screens, 200 for comfortable reading, or 300 for print.
- Press Convert and wait; each page is rendered in turn.
- Download: one image for a single-page PDF, or a ZIP with one image per page.
Need just one page from a long file? Extract it first with Split PDF, then convert — faster, and you get the image directly without a ZIP.
Expected sizes (rough)
| Page type | JPG 144 | JPG 300 | PNG 144 | PNG 300 |
|---|---|---|---|---|
| White text page | Very small | Small | Small | Medium |
| Page with a large photo | Medium | Large | Large | Very large |
| Scanned page | Medium | Large | Large | Very large |
Numbers vary widely with content, but the pattern holds: PNG at 300 DPI for a scanned page is the biggest option, and you rarely need it.
To shrink images after converting — say, for an upload limit — use Compress image or Resize image. For tight limits, read How to reduce image size in KB.
Why is my image blurry? Fixes
Resolution too low for the use
A 144 DPI image printed on A4 looks soft. Reconvert at 300.
The page was a low-resolution scan
If the PDF page is a 100 DPI scan, converting at 300 can't add detail that isn't there; you get a bigger file with the same detail. The only fix is rescanning at higher resolution.
How to tell: zoom to 200% in your PDF reader. Blocky, noisy text means the source is a low-resolution image.
The page was heavily compressed earlier
A file that went through strong compression has low-quality page images. Use the pre-compression original if you have it.
The image is being shown downsized
Many apps and social platforms recompress and shrink images on upload. That's not a conversion problem. In chat apps, send it as a "file" or "document" rather than a "photo" to preserve quality.
Uses and suggested settings
| Use | Format | DPI |
|---|---|---|
| Social media post | JPG | 144 |
| Slide in a presentation | PNG for text, JPG for photos | 144 or 200 |
| Upload to a portal that wants JPG | JPG | 144 or 200, then compress if needed |
| Printing a page as an image | JPG or PNG | 300 |
| Editing in design software | PNG | 300 |
| Website thumbnail | JPG | 144, then reduce dimensions |
| OCR / text extraction | PNG | 300 |
Converting vs extracting images
These are different operations:
- PDF to images renders the whole page as you see it — text, images and background — into one image.
- Extract PDF images pulls out the embedded pictures themselves at their original resolution, without surrounding text.
If a PDF contains a photo and you want only that photo at maximum quality, extraction is better — it gives you the original embedded file with no re-rendering.
Workflow: PDF pages into a presentation
- Pick the pages and extract them with Split PDF, e.g.
4, 9, 12. - Convert to PNG at 200 DPI so tables and text stay crisp on a big screen.
- Crop the important part — a table or chart — directly in PowerPoint, Keynote or Google Slides.
- Compress images inside the deck if it gets heavy, e.g. PowerPoint's "Compress Pictures".
To share a whole page in a chat or email, JPG at 144 is plenty.
Workflow: PDF page to social post
- Convert to JPG at 144 DPI.
- Crop to the platform's preferred ratio (square or 4:5) in your photo editor.
- Post — most platforms recompress anyway, so very high resolution has little benefit.
- For long text, split the page into several cropped images rather than one with tiny text.
Printing from an image: how big can it go?
Maximum good-quality print size (at 300 DPI) for each conversion resolution:
| Conversion DPI | A4 page size | Max good print size |
|---|---|---|
| 144 | 1190 × 1684 | About half of A4 at good quality, or A4 at fair quality |
| 200 | 1654 × 2339 | A4 at very good quality |
| 300 | 2480 × 3508 | A4 at excellent quality |
For posters larger than A4, print the PDF directly — its vector content prints at any size without losing sharpness. Converting to an image and then enlarging throws that advantage away.
Browser tool vs desktop software
| Factor | Browser tool (WPPR) | Software like Adobe Acrobat |
|---|---|---|
| Cost | Free | Usually a subscription |
| Privacy | File stays on your device | On your device (installed locally) |
| Resolution options | 144, 200, 300 DPI | Wider range |
| Output formats | JPG, PNG | JPG, PNG, TIFF and more |
| Works on phones | ✅ | Separate apps |
For everyday needs, the browser tool is plenty. For specialist work — commercial printing with CMYK colour management, for example — dedicated software fits better.
Other common problems
Black or transparent background: some PDFs don't define a white page background. Many tools add white automatically when rendering; if another tool gives you a dark background, try converting to JPG, which doesn't support transparency.
Fonts look different: if a font isn't embedded in the PDF, a substitute is used. That's a property of the original file and shows up in every viewer.
Conversion is slow: long files at 300 DPI take time and memory. Convert only the pages you need, or use 144 if it's enough.
The ZIP won't open on my phone: on iPhone, open it in Files and it unzips automatically; on Android, use Files → Extract.
Converting on your phone
The tools work in any mobile browser:
- Save the PDF to Files (iPhone) or Downloads (Android).
- Open PDF to JPG, choose the file and a resolution — 144 DPI is plenty for sharing.
- Download: a single image goes to Downloads; multi-page files arrive as a ZIP.
- On iPhone, tap the ZIP in Files to expand it, then use Share → Save Image to add pictures to your Photos library.
- On Android, extract the ZIP in Files, then open the images in Gallery.
For long documents on older phones, convert only the pages you need — 300 DPI renders of many pages take a lot of memory.
Accessibility: images lose text
Converting a page to an image turns its text into pixels. Screen readers can't read it, search engines can't index it, and people can't copy it. When you post page images:
- Add alt text or a caption describing the content.
- Keep the PDF available alongside the image for anyone who needs the actual text.
- For long text, prefer the PDF or plain text over a stack of images.
If you need to get text back out of an image later, OCR can recover it — but the original text is always more accurate.
Quick troubleshooting table
| Symptom | Likely cause | Fix |
|---|---|---|
| Blurry when zoomed | DPI too low for the use | Reconvert at 200 or 300 |
| Blurry at any DPI | Low-resolution scan in the source | Rescan the original |
| Huge files | PNG for photos, or 300 DPI for screens | JPG at 144 |
| Halos around letters | JPG on text-heavy page | Use PNG |
| Missing pages in ZIP | Conversion interrupted | Close other apps and retry |
FAQ
What's the best resolution for converting PDF to JPG?
144 DPI for screens and sharing; 300 DPI for print. 200 DPI is an excellent middle ground for comfortable reading.
Is PNG always better than JPG?
No. PNG is better for text and graphics; JPG is better for photos and scans, where it's far smaller with no visible difference.
How do I convert just one page?
Extract it first with Split PDF, then convert to get a single image directly.
Can I turn the images back into a PDF?
Yes, with JPG to PDF. Text will remain an image, though, and won't be selectable.
Are my files safe?
Yes. Conversion happens in your browser and files are never sent to a server. See our security page.
Why is my image so large?
Probably PNG for a photo-heavy page, or 300 DPI for screen use. Try JPG at 144.
Bottom line
Image quality from a PDF comes down to two choices: format and resolution. JPG for photos and scans, PNG for text and graphics; 144 DPI for screens, 300 DPI for print. And remember: a higher setting can't create detail that isn't in the source.
Convert your pages now with PDF to JPG or PDF to PNG — free, and nothing is uploaded.