How do I merge PDF files online for free?

Add your PDF files using the button or by dragging them in, arrange them in the desired order using the arrow buttons, then click Merge. The merged PDF downloads directly to your computer.

Why is this tool free?

inyourbrowser.com provides free in-browser tools. Because all processing happens on your device, there are no server costs to pass on to you.

Does merging PDFs reduce quality?

Pages are copied from the source PDFs without re-encoding, so there is no quality loss to text, images, or any other content.

Can I merge password-protected PDFs?

Password-protected PDFs cannot be loaded unless the protection has already been removed. The browser cannot process an encrypted PDF without the password.

What browsers are supported?

Any modern browser. Chrome, Firefox, Edge, and Safari on desktop and mobile. No extensions or plugins are needed.

Merge PDF Files Online

The fastest way to merge PDF files online. No signup, no waiting. Add your PDFs, arrange them, click Merge. All processing runs in your browser.

Drop PDF files here or click to browse

You can add multiple files

How it works

When you click Merge, pdf-lib loads each PDF you added and uses copyPages() to clone the source pages into an in-memory output document. addPage() appends them in the order shown in the list, then the resulting bytes are wrapped in a Blob and offered for download. The whole pipeline runs in the page you have open, which is why merging starts as soon as you click without any upload wait.

Processing runs in your browser

All merging happens inside your browser tab. pdf-lib combines your PDFs entirely in memory, with no network requests. You can confirm this yourselfin your browser's DevTools Network tab.

Related operations

For pulling out a single section before merging, try split PDF. To straighten sideways scans first, use rotate PDF. For shrinking the combined file, see compress PDF.

Frequently asked questions

How do I merge PDF files online for free?: Add your PDF files using the button or by dragging them in, arrange them in the desired order using the arrow buttons, then click Merge. The merged PDF downloads directly to your computer.
Why is this tool free?: inyourbrowser.com provides free in-browser tools. Because all processing happens on your device, there are no server costs to pass on to you.
Does merging PDFs reduce quality?: Pages are copied from the source PDFs without re-encoding, so there is no quality loss to text, images, or any other content.
Can I merge password-protected PDFs?: Password-protected PDFs cannot be loaded unless the protection has already been removed. The browser cannot process an encrypted PDF without the password.
What browsers are supported?: Any modern browser. Chrome, Firefox, Edge, and Safari on desktop and mobile. No extensions or plugins are needed.

Merge PDF Files Online

How it works

Processing runs in your browser

Related operations

Frequently asked questions

Related tools