PDF Toolbox

A local web app with tools for working with PDF files.

Tools

Page Merger

Select and merge pages from two PDFs into one document.

• Drag & drop or click to upload PDFs
• Thumbnail previews of each page
• Click to select pages (adds to output queue)
• Select/deselect all buttons per PDF
• Reorder pages by dragging in the output queue
• Remove from queue by clicking the × button
• Preview the merged document before downloading
• Download merged PDF with selected pages in your chosen order

Page Overlay

Combine portions of two PDF pages into one by painting a mask.

• Upload two PDFs and select one page from each
• Bottom layer and Top layer controls
• Paint to reveal portions of either layer
• Adjustable brush size
• Preview opacity slider to help visualize while editing
• Reset/Fill buttons for quick mask changes
• Preview and Download the composited result

Running Locally

Option A: Python (built-in on Mac/Linux)

cd /path/to/pdf-toolbox
python3 -m http.server 8000

Then open http://localhost:8000 in your browser.

Option B: Node.js

cd /path/to/pdf-toolbox
npx serve

Then open the URL shown in the terminal.

Dependencies

All dependencies are loaded via CDN (no installation required):

• PDF.js - Renders PDF page thumbnails
• pdf-lib - Handles PDF creation and page extraction

Browser Support

Works in all modern browsers (Chrome, Firefox, Safari, Edge).