PDF Toolkit

Underline PDF

Underline text regions in PDF — line overlay per page.

How to use

Upload file, process, download.

Add Image to PDFInsert images into PDF pages — position, resize and rotate. Add Link to PDFAdd clickable hyperlink to PDF pages — URL annotation. Add Page Numbers to PDFAdd page numbers to PDF — customize position, font, size, margins and start number. Add Text to PDFAdd custom text to any PDF page — choose position, font size and color, local processing. Batch WatermarkAdd watermark to multiple PDFs at once — batch process. Crop PDFCrop PDF pages to remove margins or focus on content — set custom crop box.

All calculations run locally in your browser; nothing is uploaded.