Merge PDF Files
Combine several PDFs into one, in the order you choose. Lossless — text stays selectable.
Working…
Done
How to use this tool
- Select your files, or drag them onto the box above.
- Click Process.
- Download the result. Nothing was uploaded at any point.
Merging copies the original page objects rather than re-rendering them, so quality, text and links are preserved exactly.
The specification
| Operation | Lossless — pages are copied, not re-encoded |
|---|---|
| Files | No limit, subject to browser memory |
| Order | Files merge in the order you add them |
| Text | Stays selectable and searchable |
Why uploads get rejected
Meeting the size is only part of it. These are the failures that actually come up:
- One of the files is password-protected. Remove the password first — we cannot bypass encryption.
- A file is not actually a PDF despite its extension.
- Very large files together exhaust the browser tab’s memory.
How it works
This operation edits the PDF's internal structure directly with pdf-lib. Pages are copied, reordered or annotated as objects — nothing is re-rendered or re-encoded.
That makes it lossless: text stays selectable and searchable, images keep their original quality, and file size barely changes. It runs entirely in your browser.
Who uses this
Combining a scanned application into one file, assembling a portfolio, or merging chapters before printing.
Frequently asked questions
Does this reduce quality?
No. This operation edits the PDF structure directly rather than re-rendering pages, so text stays selectable, images keep their original quality, and nothing is re-compressed.
Can it handle password-protected PDFs?
No. Remove the password in your PDF reader first. We do not provide any means of bypassing PDF encryption.
Is there a file size limit?
100 MB per file, bounded in practice by your browser tab’s available memory. Very large documents may be slow on older devices.
Are my files uploaded to a server?
No. Everything runs inside your browser on your own device. Your file is never transmitted and never stored by us. You can confirm this by opening your browser’s Network tab while you use the tool — you will see no upload request.
Is there a limit on how many files I can process?
No. There is no daily cap, no account, and no watermark. Because the work happens on your device rather than our servers, there is nothing for us to ration.
Is this tool really free?
Yes — no account, no trial, no watermark, and no cap on usage. It runs on your own device rather than our servers, so there is no cost for us to pass on.
Does it work on mobile?
Yes. The interface adapts to phone and tablet screens, and everything runs in the browser, so there is no app to install.
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Your files stay on your device. This tool runs entirely in your browser. No file is uploaded, transmitted, or stored. You can verify this by opening your browser's Network tab while using the tool.
Disclaimer. Specifications published by exam boards, governments and platforms change without notice. We verify and date every specification on this site, but you should always confirm against the official source before submitting an application. See our full disclaimer.