PDF knowledge base

Understand the file before you edit it.

Practical, technically honest guides to PDF text layers, font behavior, privacy decisions, and common editing failures.

Text-based vs. scanned PDFs: how to tell the difference

Learn why some PDFs contain editable text while others are only page images, how to test a file, and when OCR is required.

Understand embedded fonts, text boxes, replacement length, fallback fonts, and how to review an edited PDF before sharing it.

A practical risk check for document sensitivity, transport, retention, logs, local alternatives, and safe handling of downloaded files.

Diagnose scans, outlined text, encryption, forms, damaged encodings, unsupported active content, file limits, and expired sessions.