It may be possible to add gapless metadata to existing files.

All sites allow users to add metadata to an information resource via a set of so-called machine tags (see folksonomy).

It supports adding metadata to recorded content.

Web pages are turned into Open Graph Objects by adding metadata.

Gotuit enables users to add metadata to sections of videos that are uploaded to their site.

Developers can add metadata to their code through attributes.

However, initially, users will be able to add metadata to only a few file types.

Folksonomy is also called social tagging, "the process by which many users add metadata in the form of keywords to shared content".

It does not and cannot be used to add arbitrary metadata to files.

The user can also add metadata, if desired, to clarify the meaning or include additional text content.