The TellPDF Blog

Explorations into browser capabilities, WebAssembly compilers, document encryption, and local AI reasoning.

Technology•May 28, 2026

How PDF Compression Actually Works

Ever wondered why a simple 5-page PDF can suddenly turn into a 50MB file? Here is how document compression optimizes images, fonts, and data streams.

Security•May 25, 2026

A practical guide to how document encryption works, the difference between user and owner passwords, and common privacy mistakes.

Artificial Intelligence•May 20, 2026

How do computers read and comprehend human language? A plain-English breakdown of text embeddings, vector spaces, and semantic search.

Computer Science•May 15, 2026

ZIP archives have been squeezing data for decades. Here is how dictionary pattern matching and bit encoding compress your files.

Technology•May 10, 2026

A picture of a document isn't searchable. Here is how Optical Character Recognition (OCR) translates visual pixel shapes into editable digital text.