PDF to JPG or PDF to PNG? How to choose the right image format
When to export PDF pages as JPG and when PNG is the better choice, which resolution to use for screen and print, and how to avoid blurry text.
Turning PDF pages into images is one of the most common conversions there is: a page becomes a slide, a thumbnail, a social media post, or an attachment for a system that only accepts pictures. The two formats people reach for are JPG and PNG. They are not interchangeable, and picking the wrong one is the usual reason for blurry text or oversized files. This guide explains the difference in practical terms and gives a resolution to use for each situation.
What "PDF to image" actually does
A PDF page is a set of drawing instructions: place this text in this font here, draw this line, put this picture there. Converting it to an image means rendering those instructions onto a grid of pixels at a chosen resolution. The result is a flat picture. Text is no longer text (you cannot select or search it), vector lines become pixels, and the quality is fixed by the resolution you chose at conversion time. That is fine for viewing, and it is why the resolution setting matters more than almost anything else.
JPG in one paragraph
JPEG is a lossy format designed for photographs. It stores colour in 8-bit RGB, has no transparency, and compresses by discarding detail that the eye is unlikely to notice in smooth, continuous-tone images. On photos it produces small files that look excellent. On sharp edges (black text on white, thin lines, diagrams) the same algorithm creates faint halos and smudges called compression artefacts, which get worse as the quality setting goes down.
PNG in one paragraph
PNG is a lossless format. It reproduces every pixel exactly, supports transparency (an alpha channel), and compresses well when there are large areas of flat colour, which describes most document pages. Its weakness is photographs: a full-page colour photo in PNG can be five to ten times larger than the same image as a JPG, with no visible benefit.
The decision in one table
| Page content | Use | Why |
|---|---|---|
| Text, tables, forms, diagrams | PNG | Crisp edges, no artefacts, small for flat colour |
| Scanned documents (black and white) | PNG | Same reasons; also compresses extremely well |
| Photographs, full-page artwork | JPG | Much smaller file, no visible loss at quality 80–90 |
| Mixed page (photo with caption) | JPG at high quality, or PNG if the text must be perfect | Judgement call; try both |
| Needs a transparent background | PNG | JPG cannot store transparency |
| Will be uploaded to a system with a size limit | JPG (or WebP) | Smaller files |
If you are unsure, convert one page both ways and zoom into some small text. The difference is usually obvious.
Choosing a resolution
Resolution for PDF rendering is expressed in DPI (dots per inch) relative to the page size. For an A4 or US Letter page:
- 72–96 DPI: a quick preview or thumbnail. Text is readable but soft. About 800 × 1100 pixels.
- 150 DPI: good for screens, presentations and most web use. About 1240 × 1754 pixels for A4. This is the default on PDF to JPG and PDF to PNG.
- 200–300 DPI: for printing, OCR, or when readers will zoom. About 2480 × 3508 pixels for A4 at 300 DPI. Files get large, especially as PNG.
- Above 300 DPI: rarely useful outside prepress; the file size grows with the square of the DPI.
For OCR (turning scanned text back into real text), 300 DPI is the standard recommendation; our guide on OCR for scanned PDFs goes into detail.
Converting on webutilitypro.com
- Open PDF to JPG or PDF to PNG.
- Upload the PDF. If it requires a password to open, unlock it first with Unlock PDF.
- Pick the pages (all pages or a range) and the resolution.
- Click Convert. One image is produced per page. A multi-page result is packaged as a ZIP.
- Download. Files are deleted from our server after 60 minutes.
Each page becomes a separate file named with its page number. If you need all pages in a single tall image, that is a different operation (image stitching) that we do not offer; most people who ask for it actually want a PDF with the pages they chose, which Split PDF provides.
A third option: WebP
WebP, developed by Google, supports both lossy and lossless compression plus transparency, and produces files roughly 25–35 percent smaller than JPG at similar visual quality. Every current browser supports it. It is a good choice for images that will live on a website. It is a poor choice for sending to people who will open the file in older desktop software, and some content management systems still reject it. For the web case, convert the page to PNG first and then run it through PNG to WebP; going via PNG keeps the intermediate step lossless. For a wider comparison see JPG vs PNG vs WebP vs SVG.
Common problems and fixes
- Text looks blurry. Resolution too low, or JPG with a low quality setting. Use PNG, or JPG at 150 DPI and quality 90 or higher.
- The file is huge. PNG of a photographic page, or 300 DPI when 150 would do. Switch to JPG or lower the DPI.
- Black background where the page was transparent. Some PDF pages have no white background object; JPG fills transparency with black on some renderers. Use PNG or add a white background.
- Colours look different. PDF pages can use CMYK colour; converting to an RGB image shifts saturated colours slightly. This is normal and unavoidable without colour-managed software.
- Only the first page converted. Check the page-range setting; the default on some tools is the first page only.
When not to convert to an image at all
If the goal is to let someone read the document, send the PDF. If the goal is to edit the text, convert to Word instead (see converting PDF to Word). Images are the right choice when the destination only accepts images, when you want a fixed visual snapshot that nobody can edit or copy text from, or when the page is going into a slide or a post. In those cases PNG for documents and JPG for photos will serve you well.