1. Upload a PDF file using the "Choose File" button or drag and drop it onto the page.
2. Use the navigation buttons to switch between pages.
3. Hover over or click on the PDF image to select and edit OCR text regions.
4. Edit the selected text in the input box above the image.
5. Toggle "Show All Bounding Boxes" to visualize OCR regions.
6. Click "Export PDF" to download the updated PDF with corrected OCR layers.