Guides

Practical, first-hand guides on PDF conversion, compression, page sizes, OCR, Markdown and document privacy.

• Markdown Cheat Sheet: Syntax Reference with Examples
  This reference lists every common Markdown element with a plain, one-line explanation and a short, copyable fenced code example.
• PDF Page Sizes and Dimensions: A4, Letter, Legal and More
  This guide lists standard PDF page sizes in millimeters, inches, pixels at two resolutions and PDF points, with notes on each.
• How PDF Compression Works and Why Some Files Barely Shrink
  PDF compression mostly means re-encoding the images inside a file, so the result depends heavily on what the file contains.
• PDF to Markdown: How It Works and How to Use It for AI
  Converting a PDF to Markdown keeps document structure while producing a format that is far cheaper to feed into an AI tool than raw PDF text.
• OCR for PDFs and Images: How to Get Accurate Text
  Optical character recognition reads the shapes of letters in an image or a scanned page and turns them into real, selectable text.
• Is It Safe to Upload a PDF Online? A Privacy Guide
  Uploading a document to any web tool means trusting that tool with its contents, so it is worth knowing what actually happens to the file.