How it works. The checker scans your document for UPPERCASE words (2+ characters) as acronym candidates, and recognizes a definition wherever it appears as Full Name (ACR) — the full name may be in upper or lower case. Two outputs: (1) Acronym & Definition List — a clean A–Z glossary you can paste into your report appendix, or download as CSV for Excel; (2) First-Use Check — flags acronyms used without any definition, or defined after their first use, showing a snippet of the surrounding text (plus the page number for PDFs) so you can find each spot with Ctrl+F and fix the source document. Heuristic limits: reversed forms like ACR (Full Name), glossary tables, or figure-only definitions may be reported as missing — review before finalizing. Minimum acronym length is 2 characters; trailing lowercase “s” plurals (MCLs) are normalized; AM/PM/OK are ignored. PDF text is extracted page by page; hyphenated line-breaks are rejoined, but repeated headers/footers can inflate use counts. Scanned image-only PDFs contain no extractable text and need OCR first. Acronyms defined two or more times are flagged with every location, so you can remove the repeats — or keep them deliberately. Common abbreviations (e.g., i.e., Fig., approx.) are listed on their own tab with standard forms; they never need a definition, but mixing \u2018Figure\u2019 and \u2018Fig.\u2019 is flagged. Free tier: the first 5 pages (about 2,500 words) of any document. Everything runs in your browser — your document never leaves your computer.