Student builds browser-based PDF editor from scratch after 14 months of development

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A student developer spent 14 months building a new PDF engine entirely from scratch after finding that existing JavaScript libraries only supported creating or viewing PDFs, not editing them. The project began when the developer struggled to find a reliable web tool to edit a PDF and started investigating why true browser-based PDF editing was so rare. Building the engine required reading the official PDF specification and progressively implementing codecs, compression types, font support, and textbox recognition logic. Textbox grouping proved especially challenging since PDFs store text and coordinates but no structural grouping, requiring weeks of manual analysis across many documents. The finished product, available at KeyPDF.net, supports direct text editing, redaction, annotation, form filling, page organization, and metadata editing — all without a server.

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