How to add a PNG to a PDF (the right way) in 2026
A practical, modern guide to overlaying a transparent PNG onto a PDF without losing quality, transparency or your privacy.
If you’ve ever tried to drop a logo, a stamp, or a signature onto a PDF, you know it can be surprisingly fiddly. Many free tools quietly upload your file, downsample your PNG, or stamp a watermark on the result. In this guide we’ll walk through the modern, private way to add a PNG to a PDF — entirely in your browser.
Why a transparent PNG matters
PDFs themselves don’t care about transparency, but the renderer does. When you place a PNG with an alpha channel onto a PDF page, every PDF reader correctly composites it over the existing content. That’s why a transparent logo looks crisp on top of any colour or image, while a logo with a white background looks like an ugly sticker.
Step-by-step: add a PNG to a PDF
- Open the Add PNG to PDF tool.
- Drop your PDF (Step 1) and your transparent PNG (Step 2).
- Drag the PNG to the position you want — the live preview shows you exactly what the saved PDF will look like.
- Adjust width, rotation and opacity. Pick whether the overlay applies to this page only, the first or last page, or all pages.
- Click Save PDF. Done.
Pro tips
- If your PNG has a solid white background, run it through our Background Remover first.
- For company branding, set opacity around 80–100% and place the logo in a corner.
- For watermarks, set opacity around 15–25% and centre the PNG diagonally.
Why we run everything in your browser
Documents that need a logo or signature are often invoices, contracts and IDs. Sending them to a server “just to add an image” is unnecessary risk. Our tool uses pdf-lib + pdfjs compiled to WebAssembly, so the whole pipeline finishes in milliseconds and your file never touches the network.