How to convert PNG to PDF (and keep quality)

A PNG is a lossless picture. A PDF is a document. You need the second when a form, a printer, or an inbox will not take the first. The careful way to get there is to embed the PNG in the PDF, not to photograph the screen or to squash the image into a low-quality JPEG on the way.

PNG to PDF does the embedding in your browser. Each image becomes one page. PNG files go in as PNG. The page behind them is white, so transparent pixels stay readable.

What “keep quality” actually means

PNG stores pixels without the photographic compression JPEG uses. Screenshots, diagrams, logos, and flat colors stay sharp because hard edges are not blurred to save bytes. If a converter first turns that PNG into a JPEG and then wraps the JPEG in a PDF, you pay the JPEG loss even though the download says .pdf.

Embedding skips that step. The PDF page points at the PNG data. Text in a screenshot still looks like text. A one-pixel line stays a one-pixel line. The PDF will often be about as large as the PNG, sometimes a little larger because a PDF has its own structure around the image. That size is the cost of not throwing information away. If you need a small file more than you need sharp edges, convert the picture to JPG first and use JPG to PDF.

Transparency needs a page color

PNG can store transparent pixels. PDF viewers do not all agree about what a transparent page looks like. Some show white. Some show a checkerboard. A printed page is paper, and paper is not transparent. Leaving the clear pixels untouched is technically faithful and practically confusing: a logo can vanish into the viewer’s background.

The sensible fix is a white page, drawn first, with the PNG on top. Clear pixels become white. Opaque pixels stay as they were, including their hard edges. You do not get a floating sticker on a clear sheet, and you do not get a JPEG halo around the artwork. If the PNG was already opaque, the white page sits behind it and changes nothing you can see.

Page size: Letter, A4, or the image itself

US Letter and A4 are the sizes people mean by “a PDF page”. The image is centered with a margin and scaled down if it is larger than the printable area. It is not stretched. A wide screenshot gets empty white above and below rather than a distorted aspect ratio.

Match image is the other choice. The page adopts the picture’s shape, which is what you want for a slide, a diagram, or a phone screenshot that should not sit in a portrait sheet. Very large pixel sizes are capped so the page stays within what PDF software can draw reliably. The pixels are still embedded; the page box is just not allowed to become enormous.

• Use Letter or A4 when the file will be printed or attached to a form that expects a paper size.
• Use Match image when the picture is the whole document and extra white margin would look like a mistake.
• Turn on one PDF per image when each picture must be its own file. Those files download as a ZIP.

PNG, JPG, WebP, and GIF in one document

The page accepts PNG first, and also JPG, JPEG, WebP, and GIF. A JPG is embedded as a JPEG, so it is not re-encoded into a PNG and inflated. WebP and GIF are drawn to a PNG in the browser and then embedded, because PDF does not have a WebP image type. A GIF contributes its first frame, the same limit as the resizer on this site.

Order is the page order. Drop the files in sequence, or move a row up or down before you create the document. A single image downloads as one PDF named from that file. Several images, combined, download as one PDF. Failed files are listed and left out; the rest still build.

What this PDF will not do

The pages are pictures, not live text. You cannot select a sentence out of a screenshot, and a search box will not find words that exist only as pixels. If you already have a real PDF and you only wanted images of the pages, you want the opposite tool, PDF to PNG. If you need to join existing PDFs, use Merge PDF, which copies pages instead of re-photographing them.

Nothing is uploaded. The document is built in the tab and offered as a download. Check the first page before you send it: confirm the order, the paper size, and that a transparent logo landed on white the way you expected. Open PNG to PDF when the pictures are ready.