BMP to PDF Converter

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.