Converters – to allow users to convert PDF files to other formats.Editors – to allow users to edit or otherwise modify PDF files.
Extracting embedded text is a common feature, but other applications perform optical character recognition (OCR) to convert imaged text to machine-readable form, sometimes by using an external OCR module. Some software allows redaction, removing content irreversibly for security. The distinction between the various functions is not entirely clear-cut for example, some viewers allow adding of annotations, signatures, etc. This is a list of links to articles on software used to manage Portable Document Format (PDF) documents.
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