PNG to PDF

This free online PNG to PDF converter turns a batch of PNG images into a single PDF, with a choice most converters make silently, without asking: keep every image lossless with full transparency, or flatten everything to a smaller, compressed file. Add as many PNGs as you need, put them in the right order, and pick which trade-off matches what the PDF is actually for.

PNG is the format design tools, screenshots, diagrams and icons are usually exported in, precisely because it's lossless and supports transparency — but that also means PNGs are often much larger than an equivalent photo saved as JPG, and if a batch of them is embedded into a PDF at full lossless quality without a size cap, the resulting file can balloon into the tens of megabytes. This tool makes that trade-off explicit with a single switch: turn on "Keep transparency," and every image embeds as lossless PNG exactly as it was, larger file and all; turn it off, and every image flattens to a compressed JPEG at whatever quality you choose on the slider, typically producing a dramatically smaller PDF.

That matters because the right choice genuinely depends on the source material — a set of UI mockups or diagrams where transparency and crisp edges matter belongs in lossless mode, while a batch of PNG screenshots destined for an email attachment or an upload with a size cap is almost always better off flattened and compressed. Rather than guessing at one fixed behavior, this tool lets you decide per document, with the quality slider appearing only when it's actually relevant.

Page sizing works the same considered way as the other PDF-from-image tools here: "Fit to image" sizes each page to match its image exactly, or choose standard A4 or Letter with automatic centering and an optional margin. Everything runs locally in your browser using the canvas API — nothing is ever uploaded to a server, so it's instant and private.