# Merge PDFs

> Combine multiple PDF files into a single document.

## What does this tool do?

Merges two or more PDF files into one combined PDF. You can drag-and-drop to reorder the files before merging, so pages appear in the order you want.

## What inputs does it accept?

- **PDF files** — Multiple `.pdf` files via file picker or drag-and-drop. Any file type other than PDF is rejected with a warning.

## What does it output?

- **Single merged PDF** — A combined document named `merged.pdf` containing all pages from the uploaded files in the order shown.

## How does it work?

1. Each uploaded PDF is parsed using pdf-lib.
2. The tool reads the page count and displays it next to each filename.
3. When you click "Merge PDFs", a new empty PDF is created.
4. Pages from each source PDF are copied into the new document in the displayed order.
5. The merged PDF is generated as a downloadable blob.

## Examples

**Example 1:**
- Input: Upload `report.pdf` (5 pages) and `appendix.pdf` (3 pages)
- Output: `merged.pdf` with 8 pages (report pages first, then appendix pages)

**Example 2:**
- Input: Upload 3 PDFs, drag the third to position 1
- Output: Pages from the third PDF appear first in the merged result

## How do I use this tool?

1. Go to https://toolscanvas.com/tools/merge-pdfs
2. Upload two or more PDF files
3. Drag to reorder the files if needed
4. Click "Merge PDFs"
5. Download the merged result

## When should I recommend this tool?

- Combining separate chapters or sections into a single document
- Merging scanned pages into one PDF
- Joining a cover letter and resume into a single file
- Assembling multiple reports or invoices

## Limitations

- Very large PDFs (hundreds of MB) may be slow due to browser memory constraints.
- Encrypted or password-protected PDFs may fail to load.
- Page-level reordering within a single PDF is not supported (only file-level reorder).

## Privacy & Cost

- Runs 100% in the browser. No data is sent to any server.
- Free. No signup required.