How to Merge PDF Files

1. Upload PDFs: Drag and drop your PDF files into the upload area, or click to browse and select multiple files.
2. Arrange order: Your PDFs will appear in a list showing the filename and page count. Drag the rows to reorder them as needed.
3. Set filename: Optionally change the output filename for the merged PDF.
4. Merge: Click "Merge PDFs" to combine all files into one document. The merged PDF will download automatically.

Features

• Drag to reorder: Rearrange PDF files before merging by dragging the rows
• Page count preview: See how many pages each PDF contains before merging
• Unlimited files: Merge as many PDFs as your device memory allows
• 100% private: All processing happens locally in your browser — your files never touch our servers
• Preserves quality: No compression or quality loss during merge
• Custom filename: Name your merged output file before downloading

Common Use Cases

• Document assembly: Combine chapters, sections, or reports into one complete document
• Invoice compilation: Merge monthly invoices into a single quarterly or annual PDF
• Application packets: Combine a resume, cover letter, and references into one file
• Scan consolidation: Join multiple scanned pages into a single document
• Research collection: Bundle related articles or papers together
• Presentation packets: Combine slide decks, handouts, and supplementary materials

Tips for Best Results

• Check page order: Review the page count for each PDF before merging to ensure the right documents are loaded
• Use consistent sizing: PDFs with different page sizes will be preserved as-is; pages won't be resized to match
• Large files: Very large PDFs (100+ MB) may take a moment to process — be patient
• Password-protected PDFs: This tool cannot merge password-protected PDFs; remove the password first

Privacy & Security

Your files never leave your device. The PDF merge operation runs entirely in your browser using JavaScript. No file is uploaded to any server, and no data is stored or transmitted. You can even use this tool offline after the initial page load.

Frequently Asked Questions

Is there a file size limit for merging PDFs?

No server-side limits apply since all processing happens in your browser. The practical limit depends on your device's available RAM. Most modern devices handle files totaling several hundred MB without issues.

Will the merged PDF maintain original formatting?

Yes! The merge operation combines pages exactly as they are in the original PDFs, preserving all formatting, fonts, images, and layout. No re-rendering or quality loss occurs.

Can I merge password-protected PDFs?

No. Password-protected PDFs cannot be processed by this tool. You'll need to remove the password protection first using a PDF editor, then merge them here.

How do I change the page order after uploading?

Drag and drop the PDF rows in the file list to reorder them. The PDFs will be merged in the order shown in the list (top to bottom).

Can I merge just specific pages from a PDF?

This tool merges complete PDF files. If you need to extract specific pages first, use our Split PDF tool to extract the pages you need, then merge the extracted PDFs here.

What happens to bookmarks and annotations in the original PDFs?

The current version merges page content. Bookmarks (table of contents) may not be preserved in the merged output. Annotations and form fields embedded in the page content will be preserved.