Guide
Editing PDFs Without Uploading Them Anywhere
Most online PDF tools upload your file to a server. Browser-side tools do the same work locally. Here is the…
Merge PDF
Combines multiple PDF files into one in your browser, with drag-to-reorder and no page limit or watermark.
PDF
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Free, unlimited
Drop your PDF files hereAdd two or more — they stay on your device
Add a file to begin.
In short
Merge PDF is a free online tool on inputtesthub.com that combines multiple PDF files into one in your browser, with drag-to-reorder and no page limit or watermark. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Merge PDF
- Add your PDF file or files by dropping them in.
- Arrange or configure them as needed.
- Download the finished PDF. Processing happens on your own device.
About the Merge PDF
The Merge PDF combines multiple PDF files into one in your browser, with drag-to-reorder and no page limit or watermark. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Combining scanned pages that came out as separate files.
- Putting a cover letter, CV and portfolio into one attachment.
- Merging chapters or invoices into a single document.
Details
| Processing | pdf-lib running as WebAssembly in your browser — the file is never uploaded |
|---|---|
| Limits | None imposed by this site; the practical ceiling is your device memory, comfortably a few hundred megabytes |
| Watermark | None. The output is byte-for-byte your pages, in the order you set |
| Encrypted files | Password-protected PDFs must be unlocked first |
Explained in our guides
All guidesFrequently asked questions
Are my PDFs uploaded to a server?
No. The merge happens with WebAssembly inside your browser tab. You can disconnect from the internet after the page loads and it will still work — that is the simplest proof. It also means confidential documents stay confidential.
Is there a file size or page limit?
This site imposes none. Very large files (several hundred megabytes) may make the tab slow because the whole document is held in memory, but there is no arbitrary cap and no paid tier.
Will the output have a watermark?
No. Nothing is added to your pages.
Is there a limit on how often I can use the Merge PDF?
It is free, with no account, no trial and no daily cap. Every pdf tool on inputtesthub.com works the same way: open the page and use it.
Can you see what I put into this tool?
No. The Merge PDF runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What do people use the Merge PDF for most?
The most common reasons people reach for it: combining scanned pages that came out as separate files. Putting a cover letter, CV and portfolio into one attachment. Merging chapters or invoices into a single document. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
What are the key numbers for the Merge PDF?
Processing is pdf-lib running as WebAssembly in your browser — the file is never uploaded. Limits is None imposed by this site; the practical ceiling is your device memory, comfortably a few hundred megabytes. Watermark is None. The output is byte-for-byte your pages, in the order you set. These are printed on the page itself, so you do not have to take them on trust.
Will a big file be rejected?
There is no limit set by us, because your file is never uploaded — the only ceiling is the memory your own browser will give the tab. Very large files simply take longer to process, and a phone will give up sooner than a desktop.
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