Convert PDF to Images Convert PDF to images.

The tool works by utilizing the pdfjs-dist library to parse and render PDF pages into canvas elements. This process involves creating an array buffer from the uploaded PDF file, which is then used to get a PDF document object using pdfjs-dist's getDocument method. The PDF document object contains information about the number of pages in the PDF, allowing the tool to loop through each page and render it onto a canvas element. The rendering process uses the page's getViewport method to determine the size of the canvas based on the selected resolution, which can be set to 1x (72 DPI), 2x (144 DPI), or 3x (216 DPI). Once the page is rendered onto the canvas, the tool uses the canvas's toDataURL method to convert it into an image in the desired format, either JPG or PNG. The quality of the output image can be controlled when using JPG format, with options ranging from 0.6 (60%) to 1 (100%).

The React library is used to manage the tool's state and handle user interactions, such as selecting the output format and resolution, uploading a PDF file, and triggering the conversion process. Memoization techniques are applied using React's useCallback hook to prevent unnecessary re-renders of components when their dependencies change. The responsive UI is built using CSS grid and flexbox layouts, ensuring that the tool adapts to different screen sizes and devices. When an error occurs during the conversion process, it catches the error and displays a message to the user. After successful conversion, the images are stored in the component's state as an array of base64-encoded strings, which can be downloaded individually or all at once using the download all feature.

The tool also leverages browser APIs such as document.createElement to create new HTML elements like canvas and anchor tags for downloading the converted images. The FileDropzone component handles file uploads, accepting only PDF files with a .pdf extension or application/pdf MIME type. Upon selecting a valid PDF file, it updates the component's state by calling the handleFile callback function, which in turn resets any previous errors and clears the list of converted images.