When you convert a PDF page to an image, you're rendering the vector content — text, shapes, graphics — into a fixed grid of pixels. The format you choose (PNG or JPG) determines how those pixels are compressed and stored, which affects image quality, file size, and what the image is suitable for. Most people reach for JPG by default, but for many PDF conversion scenarios, PNG is the better choice. Here's how to decide.
PNG vs. JPG: The Core Difference
| Property | PNG | JPG |
|---|---|---|
| Compression type | Lossless — no quality loss | Lossy — some quality loss on save |
| File size | Larger (especially for photos) | Smaller, especially for photos |
| Text sharpness | Excellent — text stays crisp | Compression artifacts can blur text edges |
| Transparency | Supported | Not supported (white background added) |
| Best for | Documents, diagrams, screenshots, logos | Photos, scanned images, thumbnails |
| Web use | Good for graphics; large for photos | Standard for photos and general use |
When to Choose PNG for PDF Conversion
PNG is almost always the better choice when converting PDF pages that contain:
- Text — JPG compression introduces subtle artifacts around letter edges that make text look slightly fuzzy. PNG keeps text sharp and clear at any zoom level.
- Diagrams, charts, or technical drawings — fine lines and geometric shapes suffer from JPG compression in the same way text does. PNG preserves crisp edges.
- Logos or branded graphics — solid color areas and clean vector graphics look significantly better in PNG than JPG.
- Content that will be embedded in presentations or documents — PNG images remain sharp when scaled up; JPG images show compression artifacts when enlarged.
- Anything requiring transparency — if the PDF has transparent areas and you need to place the image over a colored background, only PNG supports transparency.
When to Choose JPG for PDF Conversion
JPG is the right choice when:
- The PDF contains full-page photographs — photos compress well in JPG with minimal visible quality loss, and the file size savings are significant.
- File size is a priority — for web use, email attachments, or thumbnails where small file size matters more than absolute sharpness.
- You're creating previews or thumbnails — screen-resolution previews of PDF pages for web display are well served by JPG.
How to Convert PDF to PNG for Free
Using PDFToolShack PDF to JPG/PNG Tool
Our PDF to JPG tool supports both PNG and JPG output. Select PNG as the format before converting:
- Open our PDF to JPG/PNG tool.
- Load your PDF.
- Select PNG as the output format.
- Choose your resolution (150 DPI for screen use, 300 DPI for print or high-quality output).
- Select which pages to convert — all pages, a specific page, or a range.
- Download. Multi-page conversions are packaged in a zip file.
The tool runs entirely in your browser — your PDF is never uploaded to a third-party server.
Using Mac Preview
- Open the PDF in Preview.
- Go to File → Export.
- In the Format dropdown, select PNG.
- Set the resolution using the DPI field. 150 DPI for screen, 300 DPI for print.
- Click Save.
Preview exports one page at a time. To export all pages, select all thumbnails in the sidebar first, then export — Preview generates one PNG file per page.
Using UPDF
UPDF handles batch PDF-to-PNG conversion across all pages with full resolution control:
- Open the PDF in UPDF.
- Click Export PDF in the right panel.
- Select Image and choose PNG as the format.
- Set the resolution and page range.
- Export. UPDF saves each page as a separate PNG file in a folder.
Resolution Guide: Which DPI to Use
Resolution determines how many pixels per inch are in the output image. For PDF-to-PNG conversion, the resolution you need depends entirely on how you'll use the output:
- 72–96 DPI — web thumbnails, previews, social media images. Small file size, screen quality only.
- 150 DPI — general screen use, presentations, embedding in documents for on-screen viewing. Good balance of quality and file size.
- 300 DPI — print-quality output, high-resolution presentations, archival. Larger files but sharp at full size.
For most text-heavy PDFs converted for screen use, 150 DPI in PNG format gives sharp, readable text at a manageable file size. For more on how resolution affects both quality and file size, see our PDF to JPG guide, which covers the DPI settings in depth.
Converting PNG Images Back to PDF
If you need to go in the other direction — combining PNG images into a PDF — our JPG to PDF tool accepts PNG files. Drop in your PNG images, set the page order, and download a combined PDF. This is useful for creating PDFs from screenshots, exported slides, or design assets.
- Choose PNG for documents with text, diagrams, logos, or graphics — lossless compression keeps edges sharp
- Choose JPG for full-page photographs or when small file size matters more than perfect sharpness
- Our PDF to JPG/PNG tool supports both formats — select PNG before converting
- Mac Preview: File → Export → PNG, with DPI control
- 150 DPI is the right default for screen use; 300 DPI for print or high-resolution embedding
- PNG files are larger than JPG — for web use, consider whether the quality difference is visible at the display size
- To convert PNG images back to PDF, use our JPG to PDF tool — it accepts PNG files too
Convert PDF pages to PNG or JPG — free in your browser
Choose your format, set your resolution, select your pages. No upload to external servers, no account required.