View and edit PDF properties like Title, Author, and Subject
Metadata isn't written on the physical pages of your PDF; it is stored in a hidden, internal data structure called the Document Information Dictionary.
This dictionary contains standard keys defined by the PDF specification, such as /Title, /Author, /Subject, and /Keywords.
When you edit the metadata using this tool, you are not modifying the visible text of the document. You are directly manipulating these raw dictionary entries in the file's trailer.
In a PDF, metadata strings can be tricky because they often use specific text encodings (like UTF-16BE) to support international characters, emojis, or symbols.
Our WebAssembly engine handles this complex encoding translation automatically. When you type in a new Author name, the tool correctly encodes it into the PDF string format so you can safely enter foreign characters without corrupting the file structure.
Where is PDF metadata actually stored?
