Merge PDF

Combine multiple PDF files into one document. Drag to reorder before merging.

Drop files here or click to upload

.pdf · Max 100 files

Or paste files with Ctrl+V

Your files never leave your browser

What is PDF Merge?

Merge PDF combines two or more PDF files into a single document while preserving the original page order, formatting, embedded fonts and quality. The whole operation runs inside your browser using pdf-lib — your PDFs are never uploaded.

How to use PDF Merge

Drop or select the PDF files you want to combine (up to 100 at a time).
Drag the files in the queue to set the merge order.
Click "Merge" — pdf-lib stitches the documents together.
Download the resulting single PDF.

Why use AinnoBox

100% browser-based — your file is never uploaded to a server
No file size limits imposed by us; only your device memory
Free with no sign-up, no email, no watermark on output
Works offline once the page is loaded
Strict Content Security Policy and HTTPS by default

Want to understand why AinnoBox processes everything in the browser rather than on servers? Read How It Works or check the FAQ.