PDF Word Counter Count words, characters, and analyze text content in PDFs.

The tool works by utilizing the pdfjs-dist library to extract text content from each PDF page. This process involves importing the library and setting up a worker source, which allows for asynchronous processing of the PDF document. Once the PDF is loaded, it iterates over each page, extracting the text content using the getPage and getTextContent methods. The extracted text items are then concatenated with spaces to form a single string, which is analyzed further to extract individual words, lines, and characters.

The word count calculation involves splitting the concatenated string on whitespace characters, followed by filtering out empty strings. This approach ensures that only non-empty words are counted. Character counts are calculated with and without whitespace variants, using methods like length and replace to exclude or include spaces as needed. Unique words are counted after converting each word to lowercase and removing non-alphanumeric characters using regular expressions.

To calculate word frequency, a map data structure is used to store the count of each unique word. The entries in this map are then sorted in descending order based on their counts, allowing for the top-10 most frequent words to be displayed. The reading time estimate is calculated by dividing the total word count by 250, which is assumed to be the average number of words a person can read per minute. This calculation provides a rough estimate of how long it would take to read the entire document.

The tool also uses React state management features like useState and useCallback to manage the application's state and handle user interactions. The FileDropzone component is used to handle file uploads, while the glass-card and glass-button components provide a visually appealing interface for displaying statistics and interacting with the tool. By leveraging these technologies and algorithms, the tool provides accurate and detailed statistics about the text content of PDF documents.