Relating to converting between Portable Document Format and other file formats. Questions asking us to recommend or find a conversion tool or library are off-topic.
This tag is for questions relating to programmatically converting to and from the open standard file format pdf. If a specific conversion is involved, the appropriate tag should also be used: openoffice-writer msword tiff jpeg etc.
Conversion solutions may range from complete rasterization (and graphic embedding) to intense ocr. The middle ground generally converts at a high enough level to recognize and use text attributes where possible, falling back to graphic rendering only when necessary.
Questions asking us to recommend or find a tool, library, documentation or other off-site resource are off-topic for Stack Overflow as they tend to attract opinionated answers and spam.