PDF Merge
Combine multiple PDF files into one — drag to reorder, then download the merged PDF.
Drop PDF files here or click to upload
Multiple PDF files supported
About This Tool
Upload multiple PDF files and combine them into a single document. Drag the rows to reorder pages before merging. The pdf-lib library handles merging entirely in your browser — no files leave your device, no server is involved.
Why Merge PDF Files?
Merging PDFs is one of the most common document tasks in professional environments. Contracts that span multiple attachments, reports with separate appendices, and invoices with supporting receipts all benefit from being combined into a single, easy-to-share file.
A merged PDF ensures the recipient receives all content in the correct order without needing to manage multiple files. It also makes printing simpler — one file, one print job, correct page order.
TulTek's PDF Merge tool uses the pdf-lib library, a pure JavaScript PDF manipulation library that runs entirely in the browser. It supports merging PDFs of any size and page count. Drag-and-drop reordering lets you arrange files in the exact sequence you need before generating the merged output.
Note: password-protected (encrypted) PDFs cannot be merged without first removing the password. The tool will report an error if it encounters an encrypted PDF.
Frequently Asked Questions
How many PDFs can I merge?
There is no hard limit. However, merging very large PDFs (50+ MB total) may be slow since everything runs in your browser's memory.
Can I merge password-protected PDFs?
No. Password-protected PDFs must have their protection removed first. The tool will display an error if it encounters an encrypted file.
Are my files uploaded to a server?
No. All merging happens in your browser using the pdf-lib library. Your PDF files never leave your device.