Document Glossary
Add clickable term definitions to a PDF — highlight terms, attach a popup note, no editing of the original text.
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Add clickable term definitions to a PDF — highlight terms, attach a popup note, no editing of the original text.
Editing a text for newcomers — a religious text, a textbook, a technical manual — usually means the same specialized terms come up again and again, and not every reader already knows them. PDFree's Document Glossary lets you paste a list of term/definition pairs and automatically highlights every matching occurrence in your PDF, attaching a standard clickable popup with the definition — without changing a single word of your original text.
The output is a normal PDF. It opens in Adobe Acrobat, Apple Preview, browser PDF viewers, and most mobile apps — the highlights and definitions use the PDF format's own built-in annotation system, not anything custom that only works in one viewer.
It doesn't rewrite or reflow your document's text, and it doesn't rely on hover-only tooltips or PDF JavaScript — both are unreliable outside one specific desktop viewer. Every definition opens on click or tap, the one interaction every major PDF viewer supports for annotations.