📑 PDF Merger Guide

What is PDF Merging?

PDF merging combines multiple PDF documents into a single PDF file. Our online PDF merger allows you to upload multiple PDFs, arrange them in any order using drag-and-drop, and create one unified document. Perfect for combining reports, contracts, invoices, or any PDF documents.

How to Merge PDF Files

• Step 1: Upload multiple PDF files (click or drag & drop)
• Step 2: PDFs appear numbered in upload order
• Step 3: Drag PDF cards to reorder them as needed
• Step 4: Remove any unwanted PDFs using Remove button
• Step 5: Click "Merge PDFs" to combine all files
• Step 6: Download your merged PDF file instantly

Key Features

• Unlimited PDFs: Merge as many PDF files as you need
• Drag & Drop Upload: Easy file selection from your device
• Reorder PDFs: Drag cards to arrange merge order
• Visual Numbers: Clear numbering shows merge sequence
• Page Count Display: See pages in each PDF
• File Size Display: View size of each PDF
• Remove Files: Delete unwanted PDFs before merging
• Instant Download: Get merged PDF immediately
• No File Size Limit: Work with PDFs of any size
• Browser-Based: All processing happens locally
• 100% Secure: Files never uploaded to servers
• Free Forever: No registration or payment required

Common Use Cases

• Business Reports: Combine multiple report sections into one
• Contracts: Merge contract pages and attachments
• Invoices: Consolidate multiple invoices into single PDF
• Presentations: Combine slides from different presentations
• Academic Papers: Merge research papers and appendices
• Legal Documents: Combine legal files and exhibits
• Receipts: Create single PDF from multiple receipts
• Portfolios: Build comprehensive portfolio PDFs
• E-books: Combine chapters into complete book
• Forms: Merge filled forms and supporting documents

Why Merge PDFs?

• Easier Sharing: Send one file instead of multiple
• Better Organization: Keep related documents together
• Professional Appearance: Single document looks more polished
• Simplified Storage: Reduce number of files to manage
• Email Friendly: Attach single file vs multiple attachments
• Print Convenience: Print all pages in one job
• Archive Efficiency: Store complete sets together
• Version Control: Maintain document integrity

Drag & Drop Reordering

• Click and Hold: Click on any PDF card and hold
• Drag: Move the card to desired position
• Drop: Release to place in new position
• Auto Renumber: Numbers update automatically
• Visual Feedback: Highlighted border during drag

Merge Order Explained

• Number Badges: Orange circles show merge sequence
• Left to Right, Top to Bottom: PDFs merge in grid order
• First Number = First in Merged PDF: #1 appears first
• Reorder Anytime: Change order before merging

Privacy & Security

Your privacy is our top priority. All PDF merging happens directly in your browser using JavaScript and the pdf-lib library. Your PDF files are never uploaded to any server, stored, or transmitted over the internet. The merging process is 100% client-side, ensuring complete privacy and security of your documents. Once you close or refresh the page, all data is permanently deleted from your device's memory.

Technical Details

Our PDF merger uses the powerful pdf-lib JavaScript library for client-side PDF manipulation. The tool reads each PDF file, extracts all pages, and combines them into a new PDF document in the specified order. All operations occur in your browser's memory using modern Web APIs, with no server interaction required.

Browser Compatibility

• Chrome: Fully supported (recommended)
• Firefox: Fully supported
• Safari: Fully supported (macOS & iOS)
• Edge: Fully supported
• Opera: Fully supported

Best Practices

• Check order before merging: Verify PDF sequence is correct
• Keep originals: Save copies of original PDFs
• Review page counts: Ensure all pages are included
• Close unnecessary tabs: Free up browser memory for large files
• Use descriptive names: Rename merged PDF meaningfully
• Verify merged file: Open and check merged PDF before sharing

Limitations

• Browser Memory: Very large PDFs (500+ MB) may strain browser memory
• Processing Time: Many PDFs or large files may take longer to merge
• PDF Format Only: Only PDF files can be merged (not images or Word docs)

Troubleshooting

• Merge fails: Check if PDFs are corrupted or password-protected
• Slow performance: Close other browser tabs and try again
• Out of memory: Try merging fewer PDFs at once
• Download not starting: Check browser's download permissions

File Format Support

• Input: PDF files only (.pdf extension)
• Output: Standard PDF 1.7 format
• Compatibility: Output works with all PDF readers
• Preservation: Maintains text, images, and formatting