PDF Annotate and Combine Tool

✎

Drop a PDF to annotate

draw, text, shapes, then download

⊕

Drop PDFs here or click to browse

multiple files · drag to reorder

Annotate PDFs with freehand drawing, highlights, shapes, and text overlays, then download the marked-up file. Merge multiple PDFs into one in any order. Runs entirely in your browser. No file is ever sent to a server.

PDF Annotation Tool

Open a PDF in your browser, draw on it with freehand strokes or text, and export the annotated result. Useful for marking up homework solutions, adding notes to readings, or sketching over a template diagram. Runs entirely in the browser using PDF.js for rendering and pdf-lib for export. No file ever leaves your device.

How to annotate a PDF

  1. Click "Open PDF" and pick a file from your computer.
  2. Use the toolbar to choose a drawing color and stroke width, or select the text tool.
  3. Draw or type on the page. Scroll between pages as needed.
  4. Click "Export" to download the annotated PDF. Annotations are baked into the exported file.

PDF Combine Tool

Merge multiple PDF files into one. Add files to the list, reorder them by dragging, then click "Combine and Download." The tool copies pages from each file into a new document in the order you set. No upload, no size limit beyond available browser memory.

Common uses for students

  • Combining multiple scanned homework pages into one submission file
  • Merging lab report sections written separately
  • Assembling lecture slides with personal annotation PDFs

Frequently asked questions

Does this work with scanned PDFs?

Yes. Scanned PDFs are images embedded in a PDF container. The tool copies them as-is at the same image quality as the original.

Can I annotate on top of a combined PDF?

Yes. Combine your files first, then open the result in the annotation tab.

Is there a page limit?

No hard limit. Very large PDFs (hundreds of pages or high-resolution scans) may be slow because the browser keeps everything in memory.

Are my files private?

Yes. Everything processes locally in your browser. No file content is transmitted to any server at any point.

Part of Resultant, a free suite of browser-based tools for undergraduate engineering coursework. No backend, no account, no paywall.

Resultant Document Tools lets you annotate PDFs with freehand drawing and text, and combine multiple PDFs into one file. All processing happens client-side in your browser. No account or upload required.