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What are the best software tools for editing and manipulating large PDF files without compromising their original formatting and quality?

**PDF structure**: A PDF file is made up of a sequence of 8-bit bytes, organized into streams, objects, and cross-reference tables, which can be edited and manipulated using specialized software.

**Layout analysis**: Many PDF editors use layout analysis algorithms to identify the structure of a PDF file, including text blocks, tables, and images, allowing for more accurate editing and manipulation.

**Object-based editing**: PDF editors can edit PDF files by modifying the objects that make up the file, such as text, images, and shapes, rather than editing the file as a single, flat image.

**PDF version history**: The Portable Document Format (PDF) has undergone several revisions since its introduction in 1993, with each version adding new features and capabilities for editing and manipulating PDF files.

**Optical Character Recognition (OCR)**: Some PDF editors use OCR technology to recognize and extract text from scanned documents, allowing users to edit and manipulate the text.

**PDF compression**: PDF files can be compressed using various algorithms, such as Flate, LZW, and JPEG, to reduce their size and make them easier to transmit and store.

**Digital signatures**: PDF editors can add digital signatures to PDF files, which provide a secure way to authenticate the identity of the signer and ensure the integrity of the document.

**Redaction**: Some PDF editors offer redaction tools, which allow users to permanently remove sensitive information from a PDF file, such as text, images, and metadata.

**Layering**: Many PDF editors allow users to work with layered PDF files, where each layer can be edited and manipulated independently, similar to image editing software.

**PDF/A compliance**: Some PDF editors ensure that edited PDF files comply with PDF/A standards, which guarantee the long-term preservation and accessibility of the document.

**Batch processing**: Many PDF editors offer batch processing capabilities, which enable users to apply edits to multiple PDF files simultaneously, saving time and increasing productivity.

**Collaborative editing**: Some PDF editors provide real-time collaborative editing capabilities, allowing multiple users to edit a PDF file simultaneously and track changes.

**Accessibility features**: Many PDF editors offer accessibility features, such as text-to-speech, font size adjustment, and high contrast mode, to ensure that edited PDF files are accessible to users with disabilities.

**Metadata editing**: PDF editors can edit and manipulate metadata associated with a PDF file, including author, title, and keywords, which can improve searchability and discovery.

**JavaScript support**: Some PDF editors support JavaScript, which enables users to create dynamic, interactive PDF files that can respond to user input and perform calculations.

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