Are my uploaded PDF files kept private?

Yes, 100%. All processing is carried out entirely inside your web browser using WebAssembly and JavaScript. No files are uploaded to any server.

Can I reorder files before merging?

Yes! Simply use the up and down controls on the file cards to place pages exactly where you want them.

Organize PDF

100% Client-Side Privacy

pdf-lib (Client-Side)

Merge PDF

Merge two or more PDF files into a single unified document directly in your browser. Reorder files before combining, verify page counts, and download the merged file with zero server uploads.

Select or drop PDF files here to merge

Combine two or more documents into a single PDF in seconds.

Browse Filesor Paste (Ctrl+V)

Supported: .pdf, application/pdf (Max 80 MB)

How to Use Merge PDF

Follow these easy steps to process your file right in your browser.

1Step 1

Upload your PDF documents

Drag and drop two or more PDF files into the upload box or click to select them from your computer or phone.

Instant local processing

2Step 2

Arrange documents in order

Use the up and down arrows or drag the file cards to arrange the documents in the exact order you want them merged.

Instant local processing

3Step 3

Merge and assemble

Click the "Merge PDF Files" button. Our client-side engine reads each page buffer and synthesizes them into a single stream.

Instant local processing

4Step 4

Download the combined PDF

Save the new merged PDF document to your device immediately. None of your data leaves your device.

Instant local processing

Frequently Asked Questions

Common questions about Merge PDF and browser processing.

You can merge as many files as your device memory allows. For optimal performance on mobile devices, we recommend merging up to 20-30 documents at a time.