PDF Merge
Merge multiple PDF files into one document online for free. Drag and drop to reorder, combine PDFs in seconds. 100% client-side — your files never leave your browser.
Drop PDF files here or click to browse
Select multiple .pdf files (up to 50MB each)
Combine Multiple PDFs into One Document
Need to combine several PDF files into a single document? Our PDF Merge tool lets you upload multiple PDF files, reorder them with simple drag-and-drop, and merge them into one unified PDF — all directly in your browser. No server uploads, no sign-ups, no watermarks.
The tool uses the pdf-lib library to read and combine PDF pages entirely on the client side. Simply add your files, arrange them in the desired order, and click merge. The resulting PDF preserves all pages, formatting, and content from each source file. Perfect for combining reports, contracts, scanned documents, or any PDF files you need in one place.
How to Merge PDF Files
Add Your PDF Files
Click the upload area or drag and drop multiple PDF files at once. You can also use the "Add Files" button to add more files later. Each file can be up to 50MB.
Reorder as Needed
Drag files using the grip handle to rearrange the order, or use the up/down arrow buttons. The merged PDF will follow the exact order shown in the file list. Remove any files you don't need with the X button.
Merge & Download
Click "Merge PDFs" (or press Ctrl+Enter) and watch the progress bar. Once complete, click "Download" to save your merged PDF. The original files remain unchanged.
Powerful PDF Merging Features
Multiple File Support
Add as many PDF files as you need. Upload them all at once via drag-and-drop or add them one by one. Each file's page count and size are displayed clearly.
Drag to Reorder
Easily rearrange the order of your PDF files by dragging the grip handle. Move files up or down with arrow buttons for precise control over the final document order.
Complete Privacy
Your files never leave your browser. All processing is done 100% client-side using pdf-lib. No server uploads, no data collection, no third-party access.
Fast Processing
Merging happens instantly in your browser. No waiting for server processing or file uploads. Even large PDFs are combined in seconds thanks to efficient page copying.
No File Limit
There is no restriction on the number of files you can merge. Add 2 files or 50 — the tool handles them all. Each individual file supports up to 50MB.
Page Count Preview
See the page count for each PDF file before merging. The stats bar shows total files and total pages, so you know exactly what your merged document will contain.
Common Use Cases
Business Documents
- Combine invoices into monthly batches
- Merge contract pages and appendices
- Consolidate reports from different departments
- Create comprehensive proposal packages
Academic Papers
- Combine research papers and references
- Merge thesis chapters into one document
- Consolidate lecture notes and handouts
- Create study guides from multiple sources
Legal Documents
- Combine legal filings and exhibits
- Merge signed pages with main documents
- Consolidate case materials and evidence
- Create complete contract packages
Personal Organization
- Combine scanned receipts for expense reports
- Merge travel documents into one file
- Consolidate medical records
- Create unified archives of related documents
File Order Matters
Pages are combined in the exact order shown in the file list. Use the drag handles or arrow buttons to arrange files before merging. The first file's pages appear first in the output.
Large Files
Very large PDF files (50MB+) may take longer to process depending on your device. For best performance with many large files, try merging in smaller batches and then combining the results.
Page Count
Check the page count for each file in the file list, and the total pages in the stats bar. This helps you verify all pages are accounted for in the final merged document.
Browser Compatibility
This tool works best in modern browsers like Chrome, Firefox, Edge, and Safari. The pdf-lib library ensures consistent results across all platforms. No plugins or extensions required.
File Size
The merged PDF size is approximately the sum of all input file sizes. If you need a smaller output, consider compressing individual PDFs before merging them.
Originals Preserved
Your original PDF files are never modified. The tool creates a completely new merged document by copying pages from each source file. Your originals remain safe and unchanged.