The short version
PNG and JPG are both useful inputs for a PDF, but they preserve different kinds of detail. JPG is often practical for photographs, while PNG can keep sharp interface captures, diagrams, and text-heavy graphics cleaner. The right choice depends on what the image contains and where the finished PDF will go.
- Start with the smallest workflow that solves the problem.
- Keep the original file until you have reviewed the export.
- Check the tool limits and privacy mode before processing.
Use JPG for photographs and everyday scans
JPG uses lossy compression, which can keep photographic files relatively compact. It is usually a sensible source for camera photos, receipts, and scans where a moderate amount of compression is acceptable.
Repeatedly editing and re-saving a JPG can introduce additional artifacts. If text edges already look soft or blocky, placing the image in a PDF will not make it crisp again.
Use PNG for sharp graphics and text-heavy images
PNG is often better for screenshots, diagrams, logos, and images with large areas of flat color or fine edges. It can preserve sharp boundaries without the same kind of lossy artifacts as JPG.
PNG is not automatically smaller or better for every source. A detailed photograph may produce a substantially larger PNG than a visually acceptable JPG, so compare the actual output rather than choosing by reputation alone.
Make the decision based on the destination
For printing or formal submission, inspect small text at the intended size. For email or web sharing, check the final PDF size. If the document must be searchable, remember that choosing PNG or JPG does not replace OCR.
Frequently asked questions
Is PNG always higher quality than JPG?
Not in every situation. PNG can preserve sharp graphics well, while a high-quality JPG may be entirely suitable for photographs. Source content and export settings matter.
Which format is better for a scanned document?
Either can work. Use the format that keeps the text legible at an acceptable file size, then review the resulting PDF before sharing.
Can a transparent PNG stay transparent in a PDF?
Transparency behavior depends on the conversion workflow and PDF rendering. Do not assume every reader or layout preserves it identically.
Why did my PNG-to-PDF result become large?
PNG can be large for detailed or photographic images. Check source dimensions and consider a suitable compression strategy after confirming the required quality.
Does choosing PNG make a PDF searchable?
No. PNG is an image format. Searchable text requires a native text layer or a separate OCR process.