Two Common PDF and Image Tasks
Working with PDFs and images usually comes down to two needs that point in opposite directions: turning a PDF into individual images, or combining several images into one PDF. Both are quick to do online without installing software or paying for a desktop suite.
How to Convert a PDF to JPG
Turning PDF pages into images is useful for posting a page on social media, dropping a page into a slide, or sharing a single page as a picture. Our free PDF to JPG tool handles it:
- Open the PDF to JPG tool and upload your PDF.
- Choose a resolution and an output format, or leave the defaults alone.
- Each page is rendered as a separate image.
- Download a single page, or get every page at once as a ZIP for multi-page documents.
This is ideal when someone needs to see a page as an image rather than open a PDF reader. The two settings above the button are the ones that decide whether the result is usable, so they are worth understanding before you convert a hundred-page document at the wrong size.
Choosing a Resolution: What 1x, 2x and 3x Actually Mean
A PDF has no resolution of its own. It stores pages in points, and a point is 1/72 of an inch, so rendering at 1x produces exactly 72 pixels per inch. Every other option is a multiple of that. Here is what came out of a real A4 document converted at each setting:
| Setting | Effective DPI | Pixels from an A4 page | Page size as JPG | Use it for |
|---|---|---|---|---|
| 1x (screen) | 72 DPI | 595 × 841 | 8.5 KB | Thumbnails, previews, quick reference |
| 2x (retina) | 144 DPI | 1190 × 1683 | 25.5 KB | Anything viewed on a screen, including slides and social posts |
| 3x (print) | 216 DPI | 1785 × 2525 | 51.6 KB | Printing, and any page where small text must stay crisp |
A few things follow from those numbers. 1x is genuinely small: body text at 72 DPI is legible on screen but falls apart as soon as anyone zooms in or prints it. 2x is the sensible default for almost everything, which is why it is preselected. And the cost of going up is mild, because the file grew roughly six times between 1x and 3x while the pixel count grew nine times.
One honest caveat about the print setting. Commercial printing usually asks for 300 DPI, and 3x gives you 216. That is fine for an office printer and for most everyday documents, but if you have been handed a genuine 300 DPI specification, this tool will not reach it and you should render the PDF from the application that produced it.
JPG or PNG for the Pages?
The format choice depends on what is on the page rather than on which format is generally better.
Pick PNG for text-heavy pages. JPEG compression works by discarding detail it considers unimportant, and it is at its worst on high-contrast edges, which is exactly what letterforms are. The result is faint halos around text, most visible on small type. PNG is lossless, so the edges stay clean. It costs you size: the same text page in our test came out at 25.5 KB as JPG and 67.6 KB as PNG.
Pick JPG for photographic pages. Scanned photographs, product shots, brochure pages and anything with gradients compress well and show no meaningful artefacts. On the photographic page of our test document, PNG was 46.2 KB against 38.5 KB for JPG, so the lossless format bought very little.
Mixed pages are a judgement call. For a page with a chart, a photo and a paragraph of text, ask which part matters most. If someone has to read the page, choose PNG. If they mainly have to look at it, JPG is smaller and no one will notice.
Working With Multi-Page PDFs
Every page becomes its own image; there is no option to merge them into a single tall picture. The tool names each output after the source document with a zero-padded page number, so report.pdf produces report-page-001.jpg, report-page-002.jpg and so on.
The padding is there for a practical reason. Without it, a folder of 12 pages sorts as page 1, then 10, 11, 12, then 2. Zero-padding keeps page 2 in second place in every file manager and in every upload dialog, which matters when you are reassembling the pages later.
If you only need part of a long document, use the page range field rather than converting everything and deleting the rest. It accepts individual pages and spans in one expression, such as 1-3,5,8, and it saves a great deal of processing on a large file. When you convert several pages at once, the Download All option packages them as a single ZIP named after the document.
How to Combine Images Into a PDF
The reverse is just as common: you have several photos or scans and need them as one tidy PDF, for an application, a portfolio, or a record. Use the Image to PDF tool:
- Open the Image to PDF tool and add your images in the order you want them.
- Each image becomes a page in a single PDF.
- Download the combined PDF, ready to send or print.
Tips for Clean Results
- Resize large photos first. Phone photos are huge. Scaling them down with the Image Resizer keeps the PDF a reasonable size.
- Use consistent dimensions. Images of similar size produce a neater, more uniform PDF.
- Order before you combine. Arrange images in the right sequence so the pages flow correctly.
- Compress when emailing. If the PDF will be emailed, smaller source images keep it under attachment limits.
Troubleshooting
The output is blurry or the text looks soft. The resolution was too low for the use. Text that reads well on screen at 2x can look soft when printed or projected. Convert again at 3x and compare; there is no way to sharpen a page after the fact, because the detail was never rendered.
The files are much bigger than expected. Three things drive size, in this order: resolution, format and page content. Dropping from 3x to 2x removes more than half the pixels. Switching a photographic page from PNG to JPG removes more again. If the pages are still heavy, run them through the image compressor, which can target an exact file size.
The text has faint halos around it. That is JPEG compression meeting sharp edges. Convert that page as PNG instead.
The fonts look wrong or characters are missing. This comes from the PDF rather than the conversion. If a document was built with fonts that were never embedded, any renderer has to substitute something, and letter spacing and glyphs shift. The fix is to re-export the PDF from the original application with fonts embedded.
The pages come out in the wrong order. Almost always a sorting problem rather than a conversion problem. The zero-padded filenames sort correctly by name; if you have renamed them, check that the sort is by name rather than by date modified.
Nothing happens on a very large PDF. Rendering happens in your browser, so a document with hundreds of high-resolution pages is limited by your own machine. Use the page range field to work through it in batches.
Privacy and Quality
Both conversions run in your browser, so your documents and photos are never uploaded to a server, and there are no watermarks on the output. That matters more here than on most tools, because the PDFs people convert tend to be invoices, contracts, medical letters and bank statements. For scanned documents, a sharp, high-contrast scan produces the cleanest images and the most readable PDF.
Summary
Converting between PDF and images is fast and free in the browser. Turn PDF pages into shareable images with the PDF to JPG tool, choosing 2x for screens and 3x for print, and PNG when the page is mostly text. Combine photos and scans into one document with the Image to PDF tool. No uploads, no watermarks, and no software to install.
