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Signing a PDF normally means uploading it to a stranger or buying software. This runs in your tab; turn off your wifi once it loads and everything still works.
Sign it, fill it, cut text out of it, merge it, reorder it, split it. The toolbar across the top is what a click on the page does; the rail down the left is the document's own shape.
Pages are copied across whole: their fonts, their images, their form fields and their annotations come with them. Nothing is rasterised, nothing is re-compressed, and text stays selectable and searchable exactly as it was. A page that comes out of here is the page that went in, in a different place.
Drawing a black rectangle over text is not redaction, and it is how governments and law firms have leaked documents for twenty years. The text stays in the file underneath the box: you can select it, search it, or hand the file to a chatbot and ask what the box is hiding. Free tools that offer “black out” almost always do exactly this.
So the delete tool here does not draw anything. Click a word and this finds the actual instruction in the file that drew it, and removes that instruction. The characters stop existing. Nothing is covered, nothing is flattened, and every other word on the page is still real selectable text, so you can delete one line out of a contract and the rest of it stays a normal PDF.
That only works when a word can be tied to one instruction. Some documents draw text in ways that cannot be, and rather than guess and cut the wrong sentence, the editor says so and points you at black out instead. That is the blunt fallback: the whole page is rendered to pixels with your boxes painted in and the original page thrown away, so the text really is gone, but the page stops being selectable text and the file gets bigger. Only the pages you black out are affected. If you black out a page, check the preview covers every character, because what your box misses is still readable as pixels.
Too big to email? Shrink it. Locked against copying? Unlock it. Just rearranging pages? The rail down the left side does that.