Thus, the desire for editors that are able to load, modify, and again save the immutable PDF documents arose at an early stage.įor a time, Ghostscript was the tool of choice: You converted the PDF to PostScript, then edited the source code in a text editor, and finally converted the document back to PDF. In practice, you often have good reasons for editing "finished" print files – whether to add minor corrections, replace individual characters, remove short sections of text, or add annotations. Editing PDF files therefore contradicts the stated aim of the file format: unchanged forwarding. It is based on the PostScript programming language, a PDF being a compiled – and thus no longer editable – version of the PostScript code. PDF was originally designed as a print format for forwarding and exchanging documents without allowing changes.
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