PNG to PDF — Combine PNG Images into a PDF

About PNG to PDF

This combines one or more PNG images into a single PDF, one image per page. PNG is the format screenshots, exported diagrams, logos and design mock-ups usually come in, so this is the tool for turning a run of screenshots into a shareable document, packaging UI exports for a client, or making a printable sheet from graphics that need crisp edges and no compression artefacts.

Everything runs locally, which suits internal screenshots or design work you don't want passing through a third-party server.

Working with JPG photos instead, or a mix of formats? See JPG to PDF or Images to PDF.

How it works

Each PNG is embedded into a new PDF using pdf-lib in your browser. PNG is a lossless format, and the images are embedded losslessly too, so sharp text and hard edges in screenshots and diagrams stay crisp. Page layout options:

Fit to image — the page matches the image exactly, no margin.
A4 (595.28 × 841.89 pt) or US Letter (612 × 792 pt) — the image is scaled to fit within your margin (0–80 pt) and centred, aspect ratio preserved.
Orientation auto (based on the image shape), portrait, or landscape.

Images become pages in the order added.

Assumptions and defaults

One image per page, in add order.
Fit to image maps 1 pixel to 1 PDF point (1⁄72 inch), so a large screenshot produces a physically large page. For printing, pick A4 or Letter.
PNG transparency: transparent areas are embedded as-is. On a PDF page (which has no inherent background) they'll appear against whatever is behind — effectively white when printed or viewed normally.
Default margin on A4/Letter is 24 pt.

Limitations

File size: PNG is uncompressed-ish by nature, and it's embedded losslessly, so PDFs from large or numerous PNG screenshots can be big. There's no compression option here — if size matters more than fidelity, converting the PNGs to JPG first will shrink the result.
No reordering or removing after adding — pages follow add order; clear and re-add to change the sequence.
Corrupted images will stop the build with an error message.
Batch size is bounded by your device's memory, since all work is done locally.
Need to go the other way and pull images back out of a PDF? Use PDF to PNG.

Privacy

PNGs are converted in your browser with pdf-lib. No image or PDF is uploaded or stored anywhere.

Frequently asked questions

Is this PNG to PDF tool free?

Yes — free, no sign-up, no watermark, no usage limits.

Are my images uploaded?

No. The PDF is built locally with pdf-lib; your PNGs never leave your device.

Does it keep PNG transparency?

Transparent pixels are preserved in the embedded image, but a PDF page has no transparency of its own, so those areas effectively show as white when viewed or printed.

Will my screenshots stay sharp?

Yes. PNG is lossless and the images are embedded without re-compression, so text and hard edges in screenshots and diagrams remain crisp.

Why is the PDF large?

PNGs are embedded losslessly, so many or high-resolution PNGs make a big PDF. This tool doesn't compress; convert the PNGs to JPG first if you need a smaller file.

Can I combine multiple PNGs into one PDF?

Yes — add several and each becomes a page, in the order you added them.

Can I choose the page size?

Yes — fit each page to the image, or use A4 or US Letter with an adjustable margin and orientation.

Does it work on mobile?

Yes, it runs entirely in the mobile browser.

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