Table of contents
JPG for photos and disposable page previewsPNG for sharp pixels and transparencyPDF for pages and document featuresVerify the format against the next taskJPG for photos and disposable page previews
JPG uses lossy raster compression. It suits photos and page previews when the destination accepts a single image. More pixels or higher encoding quality can require more bytes; JPG is not always smaller than a compact PDF or PNG.
Re-encoding a JPG can add artifacts around text and edges. Keep the source and create each export from it. JPG does not retain searchable text, links, PDF forms, document accessibility tags, or cryptographic signatures. It also has no alpha transparency.
Combine images or export a page
Whichever direction you need, the tools below handle both JPG/PNG and PDF conversion.
PNG for sharp pixels and transparency
PNG uses lossless pixel compression and supports transparency. It is useful for screenshots, logos, and graphics with sharp edges. It may be smaller than JPEG for flat colors or larger for photos; compare actual exports.
Lossless encoding does not make every save byte-identical. Editing, resizing, or color conversion can change pixels, and metadata or encoder choices can change file bytes. PDFPixel accepts PNG in image-to-PDF and resizing, but its page exporter produces JPG only. Resizing to JPG gives transparent regions a white background.
PDF for pages and document features
PDF can package multiple pages, text, vector artwork, fonts, images, links, and forms. Keep the original when those document features or a verifiable digital signature matter. Viewer behavior and how the PDF was created still affect what is available.
A PDF built from phone photos remains page pictures unless OCR is added separately. PDFPixel’s JPG/PNG-to-PDF tool fits one image per A4 page without creating searchable text. Its compression tool rebuilds pages as JPEG pictures and removes text, links, forms, accessibility structure, and cryptographic signatures. A visible signature is not verification.
Verify the format against the next task
For a portal, use its explicitly accepted format, pixel dimensions, bytes, page count, and signature requirements. A camera icon does not establish the accepted file types. Do not infer a size limit from the kind of organization receiving it.
For printing, start with the original PDF and verify page size and print scaling. For a website preview, export a needed page and inspect the JPG at its display size. For reuse of an embedded photo, use [true extraction](/blog/extract-images-from-pdf-file), not a page crop.
Open the downloaded result, inspect the content and dimensions, and keep the original. Converting between containers does not restore information already lost in an earlier conversion.
Match the format to the next step
Convert based on what happens after you send the file, not habit.
FAQ
Does PDF always have selectable text?
No. A scanned or image-built PDF may contain only pictures. OCR is a separate step.
Is JPG always smaller than PNG?
No. Content, dimensions, and compression determine bytes. Flat graphics can be compact as PNG; compare actual outputs.
Does a picture of a signature preserve its verification?
No. Cryptographic signature validation belongs to the original signed document, not a rendered page or rebuilt PDF.