Merge PDF
Combine multiple PDF files into a single document. Supports drag-and-drop sorting with no file count limit, all processed locally in your browser.
The merge PDF tool concatenates two or more PDF files into a single continuous document. Pages from each file are appended in the specified order, preserving original content, fonts, and images without re-encoding. This makes merging suitable for assembling reports, contracts, and presentation materials.
A common workflow is collecting separate PDF chapters from different authors and merging them into a complete report. You can also combine separately saved files such as scanned documents, receipts, or form pages. The drag-and-drop interface allows you to rearrange file order before merging, ensuring the final document is arranged as intended.
All processing is done locally in your browser. PDF files are never uploaded to any server, and confidential documents remain on your device throughout the entire merging process.
How to Merge PDF Files
Upload PDF files
Click the upload area or drag in multiple PDF files. You can select multiple files at once from your file browser or add them one by one.
Arrange file order
Drag files to reorder them. The order from top to bottom in the list determines the page arrangement after merging. The first file becomes the first pages of the result.
Merge files
Click the merge button. The tool merges all files in the specified order. Processing time depends on total page count and file size.
Download merged result
The merged document downloads to your device. Check the output to confirm page order and content are correct.
Core Features
Drag-and-drop sorting
Rearrange files at any time before merging. Drag files to new positions in the list, with order updating instantly, giving you full control over the final document structure.
No file count limit
Merge count depends on available browser memory, with no artificially imposed limits. Server-side tools often restrict batch sizes or require paid plans for large batch merging—this tool has no such restrictions.
Original quality preserved
Merging appends pages at the binary level without re-encoding text, images, or fonts. The output file maintains the same visual quality as source files. This differs from compression—compression reduces file size by re-encoding image data.
Encrypted file support
If a source PDF is encrypted, the tool prompts for a password to unlock before merging. Unlocking is done locally, and you can re-encrypt the result using the encrypt PDF tool after merging.
| Feature | Description |
|---|---|
| File count limit | Unlimited |
| Single file size limit | Unlimited |
| Supported formats | |
| Processing method | Browser local processing |
Use Cases
Assemble multi-chapter reports
When different team members submit separate PDF chapters, merging combines them into a single deliverable. Arrange files in chapter order, merge once, and distribute the complete report.
Combine scanned documents
Scanners often save each page as a separate file. Merge these pages into a single PDF for easy emailing, archiving, or printing. Ideal for digitizing multi-page contracts, receipts, or forms.
Organize presentation materials
Merge speaker notes, slide printouts, and appendix materials into a single PDF for distribution to attendees. Attendees receive a single file containing all materials, arranged in the intended reading order.
FAQ
Can I merge more than two PDF files at once?
Yes. The merge tool supports merging any number of PDF files in a single operation. You can select all files at once or add them progressively—there is no file count limit. Pages from each file are appended in the order arranged before merging.
Does merging PDFs reduce document quality?
No. Merging operates at the page level, appending pages from each source file without re-encoding content. Text, images, and fonts remain identical to the original files. This differs from compression—compression reduces file size by lowering image quality.
Can I rearrange file order before merging?
Yes. After uploading, drag any file in the list to change its position. The order from top to bottom determines the page arrangement after merging. You can adjust the order multiple times before merging.
Is there a file size limit when merging PDFs?
Since all processing is done in the browser, there is no server-side file size limit. The practical limit is your device's available memory. For very large files (hundreds of megabytes), we recommend closing other browser tabs before merging to free up memory.
Can I merge password-protected PDFs?
Yes. If a source file is encrypted, enter the password when prompted. Decryption is done locally on your device. After merging, you can use the encrypt PDF tool to re-encrypt the result to restore password protection.
Does the merge tool work on mobile phones?
Yes. The tool runs in any modern mobile browser. You can select files from phone storage, arrange order, and merge directly on your device without installing an app.
What happens to bookmarks and links after merging?
Links within each source file that reference page numbers which shift after merging may become invalid. Bookmarks from source files are usually preserved but may need reorganization. We recommend checking document navigation after merging and adjusting as needed.