PDF/A Validator Validate PDF/A.

The PDF/A Validator works by utilizing the `pdf-lib` library to load and analyze the PDF document on the client-side, ensuring user data privacy. It employs a series of checks, including verifying the presence of required metadata such as document title, author, and creation date, using the `getTitle`, `getAuthor`, and `getCreationDate` methods provided by `pdf-lib`. The tool also inspects the document's structure, checking for a valid page tree and consistent page sizes, by iterating over the pages obtained from `doc.getPages()` and comparing their sizes. To detect encryption, it attempts to load the document with and without ignoring encryption using `PDFDocument.load` with the `ignoreEncryption` option, catching any errors that occur when trying to load an encrypted document.

The validator's user interface is built with React, leveraging features like memoization through `useCallback` to optimize performance. The tool's responsiveness is ensured by using a combination of React state management and CSS styling. When a file is dropped into the `FileDropzone` component, the tool triggers a series of asynchronous operations, including loading the PDF document and performing the various checks. The results are then stored in the component's state using `useState`, allowing for efficient rendering of the validation report. By utilizing the Clipboard API, the tool can also handle copying and pasting of file contents, further enhancing its usability. Overall, the validator's technical implementation provides a robust foundation for accurate and efficient PDF/A validation on the client-side.