Merge PDF
Combine multiple PDF files into a single document
What is PDF merging?
Merge PDF combines multiple PDF files into a single, unified document in seconds. Whether you have scanned pages, exported reports, or separate chapters, this tool joins them in the order you choose — no software installation or account required.
All merging happens entirely in your browser using PDF-lib. Your files are never uploaded to a server, so your documents stay private. The output is a standard, fully compatible PDF that opens in any PDF reader.
How to use Merge PDF
Upload your PDF files
Click the upload area or drag and drop your PDF files. You can select multiple files at once.
Arrange the order
Drag the file thumbnails to reorder them, or remove any file you don't need.
Click Merge PDF
The files are combined in your browser. No data is sent to a server.
Download the merged PDF
Click the Download button to save the combined PDF to your device.
Frequently asked questions
Is it safe to merge PDFs online?
Yes. This tool runs entirely in your browser — your files are never uploaded to any server. The merge happens locally using JavaScript, so your documents remain private on your device.
How many PDFs can I merge at once?
You can merge as many PDFs as you like. Each file must be under 50 MB, and the total size of all files should be manageable for your browser. Very large sets of high-resolution PDFs may require more time to process.
Will merging PDFs reduce their quality?
No. The merge operation preserves all content exactly as-is — text, images, vector graphics, and annotations are all retained at full quality. The tool does not re-render or compress any content during merging.
Can I merge password-protected PDFs?
Password-protected PDFs must be unlocked before merging. You can use the Unlock PDF tool on this site to remove the password first, then merge the resulting files.