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Synapsi

Free PDF merger

Add two or more PDFs and download a single combined file in seconds. No signup, no AI.

Add at least two files
Studying from this file?
Turn it into flashcards, a quiz, and a Feynman teach-back that checks you actually learned it. Free account, no card.

This free merge PDF tool combines two or more PDFs into one file, in the order you pick. Add your files, set the order, and download a single PDF in seconds. No sign up, nothing to install, and your files are processed in memory and never stored.

01

Add your PDFs

Choose two or more PDFs or drop them in. No account needed.

02

Convert

We build your new file in a few seconds.

03

Download

Your file downloads right away, processed in memory and never stored.

Why use this merge pdf

Your order, kept

The files merge in the order you add them, so the combined PDF reads the way you intend.

Up to 20 at once

Combine a stack of PDFs in one go, not two at a time.

Nothing to install

No app, no account, no plugin. Use it in any browser, on any device.

Your files stay private

Everything is processed in memory and never stored. Nothing is kept after you close the tab.

Who it's for

Students

Combine separate chapter PDFs or your scanned pages into one file to read or hand in.

Anyone with paperwork

Join receipts, forms, or pages into a single PDF to attach or print.

On any device

No software to download. Merge PDFs from a laptop, tablet, or phone in the browser.

Your files are never stored

The converter works without an account. Your file is processed on our server in memory, never written to disk, and dropped as soon as the conversion finishes. Nothing is stored, and no AI reads your document.

Questions

How many PDFs can I merge?

Up to 20 at a time. They're combined in the order you add them.

Is it private?

Yes. No account, and the files are processed in memory and never stored.

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