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Building a PDF viewer in React? From quick <iframe> embeds to full-featured SDKs like Apryse and PSPDFKit, this guide compares every major approach. You’ll learn when to use react-pdf (the popular PDF.js wrapper), when to go headless with pdfjs-dist, and when it’s worth investing in commercial viewers for advanced features like annotation, signing, and redaction. With practical snippets, Next.js integration notes, performance tuning tips, and security best practices, this is your go-to 2025 reference for rendering PDFs seamlessly in any React project.