You need a single page from a PDF as an image. You open a PDF-to-image tool and the first question is: JPG or PNG? Both seem to work; which one matters?
This guide explains the actual differences, when JPG saves you bandwidth, when PNG saves you quality, and the specific PDF-to-image situations where one format is clearly the right call.
The 30-second answer
Use JPG when: the page is mostly photos and you want a smaller file. Use PNG when: the page has text, sharp lines, screenshots, or graphics with hard edges, and you want the image to look identical to the original.
If you're not sure: PNG is the safer default for PDF pages. PDFs are usually documents, and PNG keeps document text crisp.
The longer answer below explains why.
Quick comparison
| Aspect | JPG | PNG |
|---|---|---|
| Compression | Lossy (always loses some detail) | Lossless |
| File size (photos) | Small | 2–4× larger |
| File size (documents) | Same as photos | Often comparable |
| Text quality | Slight blurring at compression | Crisp |
| Sharp edges | Visible artefacts | Pixel-perfect |
| Transparency | Not supported | Supported |
| Best for | Photos, gradients, complex colours | Documents, screenshots, graphics with sharp edges |
| Browser support | Universal | Universal |
What "lossy" vs "lossless" actually means
JPG (also called JPEG) was designed for photographs. To shrink files, it discards information humans don't perceive easily — slight colour variations, fine texture details. The trade-off: you can store a 5 MB photo as a 200 KB JPG and most viewers can't tell.
But JPG's algorithm assumes photo-like content (gradients, smooth colour transitions). When applied to text or sharp-edged graphics, it produces visible artefacts:
- Halos around dark text on light background ("ringing")
- Coloured noise in solid-coloured areas
- Blocky edges on diagonal lines
PNG was designed for graphics. Lossless compression means the saved image is mathematically identical to the source — no information lost, ever. The trade-off: file sizes are larger, especially for photo-like content.
For PDF pages — which are usually mostly text and vector graphics — PNG's lossless approach matches the source better.
When JPG is the right choice
Use case 1: A PDF page that's almost entirely a photo
If the PDF page is essentially a single photo (real-estate listing, magazine ad, photo book page), the original was already a photo. Converting to JPG just stays in the photo format chain. Use JPG.
Result: small file, full visual fidelity (the source was already lossy-compressed).
Use case 2: Bandwidth-constrained sharing
Posting a PDF page to social media (Twitter image, Instagram, LinkedIn post) or embedding in a webpage where users may be on mobile data:
JPG at 80% quality is typically 200–500 KB per page. PNG of the same page is often 1–3 MB. For mobile users, JPG loads faster and feels more responsive.
Use case 3: Mass distribution
Sending a PDF page in a mass email or generating thumbnails for a product catalog: JPG's smaller file size compounds when you're sending hundreds or thousands of copies.
Use case 4: Print at low to medium quality
If the image will be printed at low DPI (newsprint quality, basic office printer at 200–300 DPI), JPG at 80% quality is indistinguishable from PNG in the print result. The printer's screen pattern hides JPG artefacts.
When PNG is the right choice
Use case 1: A PDF page with text
Document PDFs (contracts, reports, articles, forms) have text as the primary content. JPG compression visibly blurs small text, especially body text below 10pt. PNG keeps every character crisp.
If you'll be reading the converted image on screen at any zoom, PNG is dramatically better.
Use case 2: Screenshots or step-by-step guides
If your PDF page is a screenshot of software (instruction manual, tutorial), the screenshot itself was originally lossless. JPG would degrade UI elements like menus, buttons, and text labels. PNG keeps them sharp.
Use case 3: Diagrams and charts
Vector graphics in PDFs (charts from Excel, diagrams from PowerPoint, illustrations) have crisp edges and large solid-colored areas. JPG would smear the edges and add noise to the solids. PNG preserves both.
Use case 4: Archival
If you're saving a PDF page as an image for long-term archival (legal record, family document, reference for later editing), PNG's lossless quality means future you can re-process or edit without compounding losses.
Use case 5: Logos or trademarks
Brand assets typically use PNG specifically because logos have crisp edges and often need transparency. Converting a logo from PDF should preserve those properties.
Use case 6: Embedding in a Word document or PowerPoint
When you embed an image in another document, you'll later view it at various zoom levels. JPG looks worst at high zoom. PNG holds up.
File size comparison (real numbers)
Testing the same PDF page (a typical typed report page with a small chart) at standard quality settings:
| Format | DPI | File size | Visual quality |
|---|---|---|---|
| JPG | 72 | 60 KB | Soft text, OK for thumbnails |
| JPG | 150 | 200 KB | Acceptable for screen viewing |
| JPG | 300 | 700 KB | Print-quality but artefacts at zoom |
| PNG | 72 | 150 KB | Sharp text |
| PNG | 150 | 450 KB | Sharp text, good for any use |
| PNG | 300 | 1.4 MB | Identical to source rendering |
For a photo-heavy page (a magazine-style PDF page with multiple images):
| Format | DPI | File size | Visual quality |
|---|---|---|---|
| JPG | 150 | 250 KB | Photos look good, file is small |
| PNG | 150 | 1.8 MB | Same visual quality as JPG, 7× the size |
The size penalty of PNG is real for photo content. For text content, the gap narrows or disappears.
DPI choice (resolution)
Both JPG and PNG conversion let you pick a resolution (DPI = dots per inch):
| DPI | Use for |
|---|---|
| 72 | Screen thumbnails, web preview |
| 150 | Standard screen viewing, low-quality print |
| 300 | High-quality print, professional output |
| 600 | Archival, fine-detail scanning, photo-quality print |
Higher DPI = larger file. 300 DPI is the sweet spot for most use cases — print-quality but not absurdly large.
Use-case decision tree
| Scenario | JPG or PNG | DPI |
|---|---|---|
| Email a single PDF page | JPG | 150 |
| Embed in PowerPoint slide | PNG | 150 |
| Post to social media | JPG | 150 |
| Print on home printer | JPG or PNG | 300 |
| Archival of legal document | PNG | 300 |
| Thumbnail for a product catalog | JPG | 72 |
| Screenshot for a tutorial blog | PNG | 150 |
| Banner for a webpage | JPG (background) or PNG (foreground with transparency) | 150 |
| Save a PDF page as wallpaper | PNG | 300 |
| Combine many pages into a single image gallery | JPG (smaller per page) | 150 |
Special: when you need transparency
PNG supports alpha channels — pixels can be partially or fully transparent. JPG cannot.
If you need a transparent background (e.g., extracting a logo from a PDF page where the surrounding area should be transparent so the logo can sit on any background), use PNG.
The conversion tool doesn't add transparency automatically — the source PDF must have a transparent area, OR you'll need to edit the resulting PNG to make a colour transparent.
Conversion workflow
- Open a PDF-to-image converter (e.g., PDFGrover's PDF to JPG or PDF to PNG).
- Upload your PDF (or drag onto the dropzone).
- Pick the format (JPG or PNG, based on the use cases above).
- Pick the DPI (default is usually 150; choose higher if needed).
- Pick the page range:
- All pages — outputs every page as a separate image
- Specific pages — outputs just the listed pages
- Page range — e.g., "5-10"
- Click Convert.
- Single output: downloads as a .jpg or .png file. Multiple outputs: downloads as a ZIP.
For most uses, 150 DPI PNG is the safe default. Switch to JPG specifically when you need smaller file sizes and the content is photo-heavy.
Common mistakes
Using JPG for legal document scans. Compression artefacts can interfere with OCR or document-authentication systems. Use PNG for legal records.
Using maximum DPI for thumbnails. A 600 DPI image displayed at 100×100 pixels is wasted file size. Match DPI to the actual display size.
Saving as JPG, then editing, then re-saving as JPG. Each save cycle adds artefacts. If you'll edit the image, use PNG until done, save as JPG only at the final step.
Picking PNG for "professional quality" without checking file size. A 50-page PDF converted to 300 DPI PNG can produce 50 MB+ in images. If the destination doesn't need that quality, you're wasting space.
Using JPG for screenshots. Screenshots are graphics, not photos. JPG ruins their crispness. Always PNG for screenshots.
Forgetting the page range. Converting a 200-page PDF to images when you only needed page 5 wastes time and disk space. Specify the page range upfront.
Quick reference table
| If your PDF page is... | Convert to | At DPI |
|---|---|---|
| A photograph | JPG | 150–300 |
| A typed document | PNG | 150–300 |
| A screenshot | PNG | 150 |
| A chart or diagram | PNG | 150–300 |
| A scanned paper | PNG | 200–300 |
| A logo or branding | PNG (with transparency if available) | 300 |
| A magazine layout | JPG (mixed content) or PNG (text-heavy) | 200 |
| A receipt for an expense report | JPG | 150 (smaller) or PNG (sharper) |
| A signed contract | PNG | 200 |
| Any sensitive document | PNG (no quality loss) | 300 |
Summary
JPG and PNG are designed for different content types. PDFs that are mostly photos compress well to JPG with small files. PDFs that are mostly text and graphics need PNG to keep their sharpness.
The default rule: use PNG for documents, JPG for photos. When in doubt, PNG is safer because PDF pages usually contain text (which JPG degrades).
For the rest, PDFGrover's PDF to JPG and PDF to PNG tools both run in your browser for small files (no upload), give you choice of DPI and page range, and download as ZIP for multi-page output.