Why convert PNG to PDF?
PNG is the go-to format for screenshots, UI mockups, logos, diagrams, and any graphic that needs to stay pixel-perfect. But sharing a set of PNG files as individual attachments is awkward — recipients have to download each one separately, and there is no guaranteed viewing order. Converting them to a single PDF solves all of that: one file, one click, opens on every device in the exact sequence you set.
Common scenarios: packaging a set of UI screenshots into a design review document, bundling scanned forms or whiteboards into a single submission, assembling a portfolio of graphic assets, or turning a series of presentation slides saved as PNG into a shareable PDF deck. PDF is also the expected format for most government portals, HR systems, and printing services — converting PNG to PDF makes those workflows straightforward.
How to convert PNG to PDF online — step by step
- Upload your PNG images — drag PNG files onto the upload zone or click to browse. Add up to 30 images at once.
- Set the page order — images appear in the order you added them. Use the up and down arrows to reorder them until the sequence is correct.
- Choose a page size — A4 (210 × 297 mm, used worldwide), US Letter (8.5 × 11 in, North America), or Fit to image (each PDF page matches the exact pixel dimensions of its PNG). For A4 and Letter, pick portrait or landscape orientation.
- Click Convert — jsPDF builds the PDF inside your browser. No data leaves your device.
- Download — click the Download button to save the finished PDF.
Converting PNG to PDF on Windows, Mac, iPhone, and Android
Every major platform has a built-in route, but each has trade-offs for batch work:
| Platform | Built-in method | Limitation |
|---|---|---|
| Windows 10/11 | Right-click → Print → Microsoft Print to PDF | One image at a time; fixed page size |
| macOS | Preview → select all → File → Export as PDF | Can produce TIFF output if steps are wrong |
| iPhone (iOS) | Share → Print → pinch to open PDF | One image only; US Letter fixed |
| Android | Share → Print → Save as PDF | One image only; variable quality |
| Any browser | This tool | Up to 30 images; A4 / Letter / Fit |
For batch conversions or precise page-size control, this browser tool is faster than any platform's native option. No software installation needed.
How PNG transparency is handled in the PDF
PNG supports full alpha transparency — logos, icons, and cutout graphics often have transparent backgrounds. PDF page content does not support transparency in the same way, so this tool fills transparent areas with a white background before embedding each image. The result is a clean white-background rendering that looks correct in every PDF viewer.
If you need a non-white background (for example, embedding a dark-mode screenshot into a dark-themed PDF), the cleanest approach is to flatten the PNG against your chosen background colour in a design tool before converting here.
How to combine multiple PNG images into one PDF
Drop all your PNGs at once onto the upload zone. Each image appears in a numbered list with a preview thumbnail. Use the arrow buttons to rearrange them — the number on the left shows the final page number in the PDF. When the order is correct, click Convert. Every image becomes one page, in sequence, in the downloaded PDF.
For collections larger than 30 images, split into groups: convert the first 30, download the PDF, clear the tool, then add the next batch. You can merge the resulting PDFs using Preview on Mac, Adobe Acrobat, or any free online PDF merge tool.
PNG vs JPG: which format is better for PDF?
The answer depends on the content of your images:
- Use PNG for PDF when your images contain screenshots, logos, diagrams, charts, or text. PNG is lossless — it preserves every pixel exactly, so thin lines, text, and flat colour areas stay sharp rather than developing the blocky artefacts that JPEG compression can introduce.
- Use JPG for PDF when your images are photographs. JPEG compression is optimised for photographic content and produces much smaller files with no visible quality loss. Use the JPG to PDF converter for photo-heavy documents, and the Image to PDF converter when you have a mix of PNG and JPG files in the same batch.
Reducing the size of a PNG-to-PDF file
PNG files are lossless and can be large, especially for high-resolution screenshots or graphics exported from design tools. The resulting PDF inherits that size. There are two effective ways to reduce it before converting:
- Compress the PNG first — use the PNG Compressor to reduce file size via palette quantisation. This works well for graphics with flat colours (logos, illustrations, UI screenshots) and can cut file size by 60–90% with no visible quality loss.
- Resize the PNG — use the Image Resizer to scale down the pixel dimensions. A 2560 × 1440 screen export is often twice the resolution needed for a printed A4 page; scaling to 1440 × 810 halves the area and roughly quarters the file size.
Privacy: your PNG files stay on your device
All processing runs entirely inside your browser using the Canvas API to decode images and jsPDF to assemble the PDF document. Your PNG files are never uploaded to any server — there is no upload step, no temporary server file, and no activity log. The generated PDF exists only in browser memory until you click Download, at which point it is saved to your device. Closing the tab clears everything.