PNG to PDF Converter

About PNG

PNG (Portable Network Graphics) was created in 1996 as a patent-free, lossless replacement for the GIF format. It stores every pixel with perfect accuracy — no compression artifacts, no quality degradation on re-save — making it the standard for logos, icons, UI screenshots, charts, diagrams, and any image where pixel-perfect fidelity is more important than file size.

Transparency support

PNG supports full alpha channel transparency, meaning each pixel can range from fully opaque to fully transparent (with all gradations in between). This lets logos and icons sit cleanly on any background color without a white box or halo around the edges. JPEG has no transparency support at all; for any web image that needs a transparent background, PNG is the standard choice. WEBP and AVIF also support transparency, with smaller file sizes — but PNG remains the most universally compatible transparent-background format.

Lossless compression

PNG uses DEFLATE, a lossless compression algorithm. Every save produces bit-for-bit identical output, and no detail is ever discarded. For images with large flat areas of color, sharp geometric edges, and text, PNG compression is very efficient — a flat-color logo in PNG is often smaller than the same image as a maximum-quality JPEG. For photographs with complex color gradients, PNG files are large because lossless compression cannot discard the tonal variation; JPEG or WEBP is a better choice for photographic content.

PNG on the web

All browsers support PNG natively. It is the correct format for screenshots, UI mockups, logos, icons, product diagrams, and any image that must remain crisp and color-accurate after export. For web delivery where file size matters and transparency is not required, WEBP offers 25–35% smaller files. For transparent images on modern browsers, WEBP or AVIF are more efficient alternatives — but PNG remains the universal fallback that works in every context, including email, desktop software, and print production workflows.

About PDF

PDF (Portable Document Format) was created by Adobe in 1993 and standardised as ISO 32000 in 2008. It is the universal container for documents that must look identical on every device — fonts, layouts, vector graphics, embedded images, and hyperlinks all render consistently regardless of the operating system, application, or screen resolution.

When converting a PDF page to an image format (JPG, PNG, WEBP, or AVIF), the PDF is rasterised: each page is rendered as a grid of pixels at a specified DPI (dots per inch) resolution. This site uses ImageMagick with a Ghostscript backend for PDF rasterisation. At 150 DPI, an A4 page renders to approximately 1240 × 1754 pixels — sufficient for most presentation, social media, and documentation use cases. For print-quality output, higher DPI values produce proportionally larger pixel dimensions.

Transparency in PDFs is handled differently depending on the output format. JPEG has no alpha channel, so transparent areas are composited against a white background before encoding. PNG and WEBP retain the alpha channel, so transparent page regions produce transparent pixels in the output. Only the first page is extracted per conversion — for multi-page extraction, split the PDF first.