PNG to PDF Converter — Preserve Transparency & Detail

PNG and JPG are optimised for very different content. JPG is best for photographs, where subtle colour gradients dominate and mild compression artefacts are invisible. PNG shines with sharp edges: text, screenshots, diagrams, logos and any graphic that has flat colour regions. Naively passing a PNG through a JPG-first pipeline blurs edges and introduces ringing artefacts — which is why PNG to PDF keeps the pixels intact. We use pdf-lib’s embedPng, which places the raw PNG bytes into the output document; the result is a PDF that renders at pixel accuracy on any modern reader.

Many PNGs come with an alpha channel — transparent backgrounds, semi-transparent shadows, or knockouts around logos. A PDF page has no inherent transparency; its background is always opaque. PNG to PDF handles this by composing each PNG onto a white page background, so any transparent pixels appear white in the final document. This matches the way readers and printers actually render your output and avoids the muddy grey artefacts that some converters produce.

If you need to preserve exact transparency for downstream compositing, use the raw PNGs rather than the PDF export — the PDF format itself is not the right container for that use case.

Screenshots often have unusual aspect ratios that do not match A4 or US Letter. The Fit-to-image mode is specifically designed for this: each PDF page is sized to the exact pixel dimensions of the source PNG, so there is no whitespace and no scaling. This is the mode we recommend when you are packaging UI screenshots for review — the resulting PDF looks like a smooth scroll of your app.

A4 and Letter modes remain available when you need to print the output, or when a portal expects a standard page size. In these modes the image is scaled to fit the page while preserving aspect ratio, and centred vertically for a clean look.

Screenshots frequently contain sensitive information — tokens, personal data, confidential dashboards, or unreleased UI. That is exactly why we built PNG to PDF as a fully client-side tool. From the moment you drop a PNG into the upload zone to the moment you press Download, nothing crosses the network. Enterprise IT teams can allow this URL confidently on locked-down endpoints because the traffic profile is identical to any static content page: only HTML, JS and CSS are downloaded; no image data is uploaded.