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The editor keeps the file in this tab.
Nothing is uploaded unless you later start a server convert job and tick consent.
Redact turns that page into an image and paints the box. A black rectangle on live text is not enough.
OCR reads the page in this browser. English first. Language data may download once. A .txt copy is downloaded and an invisible searchable layer is stamped into the open file. That is not a cloud OCR bill.
Type adds a text label on top of the page. Use it for captions, notes and corrections. It does not rewrite the original PDF words, reflow paragraphs, or match Acrobat-style direct text editing.
Batch is paid. Bates stamps a sequential number. Read page uses the browser voice on live text. Compare is page and byte diffs, not a legal redline.