Convert PNG images to PDF
Turn PNG screenshots and graphics into one PDF with full control over page size, orientation, margins and image fit. Transparency renders white.
- Runs in your browser
- Files are never uploaded
- Free, no account
Add as many images as you like — they become pages in the order shown, and you can reorder or remove any of them before exporting.
How to convert PNG images to a PDF
- Add your PNG files — drop them on the box above or click to browse. Everything is processed on your device.
- Arrange the pages by dragging the cards, or with the arrow buttons on each card for keyboard users.
- Pick Auto to give every page the exact proportions of its image, or a fixed size such as A4 for a uniform document.
- Adjust orientation, margin and fit if you chose a fixed page size.
- Press Create PDF and download the result.
What happens to transparency
PNG supports an alpha channel; PDF pages do not have a background layer at all. When a transparent PNG is placed on a page, the transparent pixels simply show whatever is behind them — and behind them is nothing, which every PDF viewer and every printer renders as white paper.
In practice that means a logo with a transparent background will look correct on a normal white page and will not stay transparent if you later place the PDF over a coloured background. If you need a specific backdrop, flatten the PNG onto that colour before converting. The image data itself is preserved either way — the alpha channel is embedded, it just has nothing interesting behind it.
Screenshots: a practical recipe
Screenshots are the most common PNG input, and they are usually all different sizes. Two setups work well:
| Goal | Page size | Fit | Margin |
|---|---|---|---|
| Compact, no borders, one screenshot per page | Auto | — | 0 mm |
| Printable report with consistent pages | A4 or Letter | Fit | 12–15 mm |
| Wide UI captures that should not shrink | A4 with Landscape | Fit | 8 mm |
Is the PNG re-compressed?
No. PNG is one of the two image formats a PDF can carry natively, so the original bytes are embedded unchanged. The pages are pixel-identical to your files, and the finished PDF is approximately the sum of the input sizes plus a couple of kilobytes of document structure. Nothing is resampled, softened or watermarked.
That also means a PDF built from PNGs can be large. A dozen full-resolution desktop screenshots easily reach 20 MB. If size matters more than pixel fidelity, convert the screenshots to JPG first and use JPG to PDF, or run the finished document through a PDF compressor.
Everything stays local
Decoding and PDF assembly both happen in this browser tab using pdf-lib. No image is uploaded, so screenshots containing internal dashboards, customer data or credentials never leave your machine — and the tool keeps working with the network disconnected.
Questions
What happens to transparent areas?
PDF pages have no background layer, so any transparent pixel shows the viewer’s page colour, which is white in every mainstream reader and on print. Add a solid background before converting if you need a specific colour.
Is the PNG re-compressed?
No. The original PNG stream is embedded directly, so the pages are pixel-identical to your files. That keeps screenshots and UI mockups perfectly crisp.
My screenshots are different sizes — what should I pick?
Use the Auto page size so each page matches its own screenshot, or pick a fixed size with Fit so every page has identical dimensions and a consistent margin.
Can I mix PNGs with JPGs?
Use the Images to PDF tool instead — it accepts JPG, PNG and WebP in one batch and applies the same layout options.