分析任意 PDF 的字数、字符数、阅读时间等统计信息。
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We extract the text from every page with pdfjs-dist and report nine stats: word count, character count, characters without spaces, sentences, paragraphs, pages, unique words, average words per sentence, and estimated reading time.
If the PDF is a scan with no embedded text, run it through OCR PDF first so the counter has real words to count.