Line breaks from PDFs, double spaces, blank lines, duplicate lines: one button each. Feed the result back in to keep cleaning.
PDFs place each line separately, so copying brings a line break at every line end. Join lines within paragraphs keeps paragraphs separated by blank lines and joins only the lines inside them; Remove line breaks makes one paragraph of everything.
Remove duplicate lines treats lines that differ only by surrounding spaces as the same. Sort A–Z orders numbered lines as 1, 2, 10 rather than as strings.
Each button does one thing. Use result as input moves the result up so you can apply the next operation.
No. Everything runs in your browser; the last input is kept only in this browser.
Characters such as Ａ, １ and the ideographic space that occupy a full CJK cell. They arrive from Japanese and Chinese sources and older documents; the button converts them to ordinary ASCII.
Paste the body text. Formatting (bold, tables) is dropped; only the characters remain.