PDF to PNG vs JPG: which image format should you choose?
When you turn a PDF page into an image, the format matters more than people expect. JPG keeps files small but blurs sharp edges; PNG keeps every pixel but can be several times bigger; WebP sits in between. The right choice depends on what is on the page and where the image is going.
The short answer
- Text, tables, charts, slides, code, diagrams → PNG. Lossless, razor-sharp edges, optional transparency.
- Scanned pages and photos → JPG. Much smaller files; the slight compression is invisible on photographic content.
- Images for a website or documentation → WebP. Usually 25–35 % smaller than JPG at the same visual quality, supports transparency.
Side-by-side comparison
| JPG | PNG | WebP | |
|---|---|---|---|
| Compression | Lossy | Lossless | Lossy (or lossless) |
| Sharp text and lines | Slight halos at low quality | Perfect | Very good |
| Scans and photos | Excellent, small | Very large files | Excellent, smallest |
| Transparency | ❌ (white background) | ✅ | ✅ |
| Typical A4 page at 150 DPI | 150–400 KB | 200 KB–3 MB | 100–300 KB |
| Opens everywhere | ✅ Universal | ✅ Universal | All browsers; some old apps ❌ |
Sizes vary a lot with content: a page of plain text compresses extremely well as PNG, while a scanned page with paper texture becomes huge as PNG and small as JPG.
Why JPG struggles with text
JPG compresses blocks of 8×8 pixels by discarding fine detail. On photos that is invisible; on black text over white paper it creates faint “ringing” around letters, especially below about 80 % quality. If the image will be read on screen or zoomed into, PNG or a high-quality JPG (90 %+) is safer.
Why PNG struggles with scans
A scan is a photo of paper: noise, grain and subtle shading everywhere. PNG must store all of that exactly, so files balloon. Converting a 30-page scanned contract to PNG at 300 DPI can easily produce hundreds of megabytes. JPG at 85 % keeps it readable at a fraction of the size.
When transparency matters
Exporting a logo, a signature or a vector drawing from a PDF to place on another background? Choose PNG or WebP and enable Transparent background in the PDF to PNG tool. Note that many PDFs paint a white rectangle behind the page content — in that case the background stays white, because it is part of the page.
Where is the image going?
| Destination | Best choice |
|---|---|
| Email attachment, chat, social media | JPG (150 DPI) |
| Website, blog, help center | WebP (or JPG for maximum compatibility) |
| Slide deck or document | PNG for text pages, JPG for photo pages |
| Printing | PNG or JPG at 95 %, 300 DPI |
| OCR / text recognition | PNG, 300 DPI (or 200 DPI for large clean text) |
| Archiving | Keep the original PDF — images are copies, not replacements |
FAQ
Is PNG higher quality than JPG?
PNG is lossless, so it is never worse than the rendered page. JPG at 90 % or more is visually identical for most content but not bit-for-bit exact.
Should I use WebP?
For images on websites, yes — it is smaller and supported by all current browsers. For files you send to other people, JPG or PNG is the safer choice.