How a Browser-Based Tiled Poster PDF Generator Was Built Without a Server

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A developer built Rasterbator.app, a fully browser-based tool that converts images into tiled, printable poster PDFs without uploading files to a server. The pipeline covers five stages: local image decoding, unit conversion, page grid calculation, halftone preview rendering, and PDF generation. All measurements are converted early from millimeters or inches into PDF points to keep layout logic consistent throughout. A page overlap feature allows adjacent printed sheets to share image area, making physical assembly easier. Aspect ratio is preserved during grid calculation, with the image centered horizontally and top-aligned to handle the rounding that occurs when partial page strips require a full sheet.

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ProgrammingDEV Community ·

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