Screenshots for a bug report, diagrams for a submission, receipts to file, scanned pages to send as one document. Upload your PNG images above and get a single PDF with a page per image, in the order you choose.
Below: why PNG suits documents better than photographs do, what happens to transparent backgrounds, and how to get the page order right first time.
The two formats end up in a PDF the same way, but they arrive there for different reasons.
PNG is lossless — every pixel is preserved exactly, however many times the file has been saved. That makes it the format screenshots, diagrams, charts and logos are usually in, because JPEG compression handles hard edges badly and leaves faint halos around text.
So a PNG-to-PDF job is typically a document job: screenshots for a support ticket, a scanned form, a chart for a report, receipts for an expense claim. JPG to PDF is the one you want for photographs.
One consequence worth expecting: PNG files are larger than equivalent JPGs, so a PDF built from twenty screenshots can be a sizeable file. More on that below.
PNG supports transparency; PDF pages do not work the same way. When a transparent PNG is placed into a PDF, the transparent areas render as white — the page colour behind them.
For a screenshot or a scan that changes nothing, since those have solid backgrounds anyway. It matters for a logo or a diagram exported with a transparent background: what looked like a floating shape becomes a shape on a white rectangle.
If the result needs a specific background, set it in your image editor before converting rather than hoping the PDF will handle it.
The most common complaint about any image-to-PDF tool, and the cause is file naming.
Computers sort file names as text, not numbers. A folder containing 1.png, 2.png and 10.png sorts them 1, 10, 2 — because "10" begins with the character "1", which comes before "2". Select all, convert, and page 10 lands second.
Zero-padding fixes it. Rename them 01.png, 02.png, 10.png and text sorting matches numeric sorting exactly. For more than 99 files, pad to three digits.
Screenshots taken by your operating system are usually fine as they are, since they carry timestamps that sort correctly. The problem is mostly with files you have renamed yourself.
Worth being clear about, because it catches people out at the wrong moment.
A PDF built from PNGs contains pictures of pages. There is no text inside it — nothing to search, select or copy. Send it to an organisation that needs to process it and their systems may not read a word.
If the document needs to be searchable, run the finished PDF through OCR PDF. That adds an invisible text layer behind the images, so the pages look exactly as before and Ctrl+F starts working. It is also what makes the file readable by a screen reader, which a plain image PDF is not at all.
For anything official — an application, a claim, a filing — that step is worth taking.
PNG is uncompressed relative to JPEG, so the arithmetic adds up quickly. Twenty screenshots at 2 MB each produce a 40 MB PDF — over most email limits and slow to open.
Two ways to handle it. Compress the images before converting, or run the finished PDF through Compress PDF afterwards. Around 2000 pixels on the long edge is ample for a readable document page.
Remember that attachment encoding adds roughly a third in transit, so a 22 MB file arrives closer to 30 MB. Aim for 15 MB or less for anything going by email.
JPG to PDF suits photographs, OCR PDF makes the finished document searchable, Compress PDF shrinks it for email, and PDF to PNG works the other way. Browse all PDF tools.