Free PDF File Size Analyzer Analyze PDF file size.

The tool works by utilizing client-side JavaScript with React to analyze PDF files entirely within the browser, ensuring privacy and security for sensitive documents. When a PDF file is dropped into the tool's interface, it uses the `PDFDocument` class from the `pdf-lib` library to load the file and extract its contents. The `handleFile` function is memoized using `useCallback` to prevent unnecessary re-renders and improve performance. This function calculates various metrics such as page count, average size per page, and efficiency rating, which is determined by the `ratingFor` function based on the average size per page. The tool also extracts metadata fields like title, author, and creation date using methods like `getTitle`, `getAuthor`, and `getCreationDate` from the `PDFDocument` object.

The analysis result is stored in a `SizeAnalysis` object, which contains properties like `fileName`, `fileSizeBytes`, `pageCount`, `avgPerPageKB`, and `efficiencyRating`. The tool uses a `Set` data structure to store unique page sizes and form field types, ensuring that duplicates are eliminated. The `buildReport` function generates a plain-text report based on the analysis result, which includes detailed information about the PDF file. This report can be easily copied to the clipboard using the Clipboard API or downloaded as a text file. The tool's responsive UI is built using React and is designed to work seamlessly across different devices and screen sizes. By leveraging technologies like `pdf-lib` and the Clipboard API, the tool provides a powerful and convenient way to analyze PDF files and optimize their size for better performance.