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FileCarpenter Guides

Understand the file before you change it.

Short, practical explanations of PDF structure, form technologies, compression trade-offs and browser-to-browser transfer. Each guide links directly to the tool that applies the idea.

PDF and transfer guides

Why some PDF text is editable and some is notLearn why PDF text can be stored as normal text, positioned glyphs, subset fonts, vector outlines or scanned pixels—and what that means for safe editing.How PDF highlights and annotations actually workUnderstand how PDF highlights, underlines, strikeouts and comments are stored as annotations and when to use each type.AcroForm vs XFA: why some PDF forms fill normally and others do notLearn the difference between ordinary AcroForm fields and dynamic XFA forms, why browsers handle them differently, and what to verify before submission.How to get a PDF under an upload size limitLearn how to get a PDF under a portal size limit without guessing, what quality trade-offs matter, and why scanned PDFs behave differently.How browser-to-browser file transfer worksLearn how WebRTC file transfer connects two browsers, what signaling and TURN relays do, and how this differs from cloud upload links.Why HEIC photos and HEVC videos sometimes fail on WindowsUnderstand why iPhone HEIC photos and HEVC videos may not open everywhere on Windows and when a compatible copy can help.