Blog

Notes on streaming PDFs

Engineering deep-dives, specification notes, and performance lessons from building the fastest online PDF reader.

All78 AI1 Architecture1 HTTP Range1 Internals75 Large Files1 PDF77 PDF.js77 Specification58 StreamPDF1 Think1

Articles tagged “Large Files”

StreamPDF

Behind-the-scenes tech and product stories from the StreamPDF team.

1 articles

Don't Want to Download a Hundreds-of-MB PDF? We Achieved Instant Online Opening with HTTP Range + Server-Side Pre-Parsing

Why is opening large PDFs online always slow? This article covers HTTP Range requests, PDF xref/Pages tree structure, and StreamPDF's server-side pre-parsing approach — breaking down the tech and product experience behind 'instantly opening any page without downloading the entire file.'

StreamPDFPDFLarge Files

November 3, 2026 · StreamPDF Team