Merge PDF — Free Online Tool
Combine multiple PDFs into one file — set the order. · No signup · Works on mobile
100% private: your files are processed in your browser. Nothing is uploaded to our servers.
How to use the merge pdf
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Drop two or more PDF files into the upload zone.
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Arrange the file cards into your desired merge order.
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Click Merge PDFs and download the combined document.
What does this tool do?
This free PDF merger combines two or more PDF files into a single document in seconds — arrange the order, click Merge, and download the combined PDF. Merging happens entirely in your browser, so contracts, statements, and confidential documents never leave your device.
How does the merge pdf work?
The tool uses the pdf-lib library to copy every page from each source PDF into a new document, preserving original page sizes, orientation, images, and embedded fonts. Because pages are copied losslessly (no re-rendering), the merged PDF keeps full original quality.
Frequently Asked Questions
Is there a limit on the number or size of PDFs I can merge?
No fixed limit — merging runs on your own device, so there's no server quota. Practically, browsers comfortably handle merges of 20+ files or a few hundred MB total. Very large scanned PDFs (500 MB+) may be slow on low-memory phones; use a desktop for those.
Will merging change my PDFs' quality or formatting?
No. Pages are copied at the object level — text stays selectable, images keep their original resolution, and page dimensions are preserved exactly, even when mixing A4 and Letter files. The merged file is typically about the sum of the input sizes.
Is the PDF merger really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. No account or email needed. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Are my files private when using the PDF merger?
Completely. The PDF merger processes everything locally in your browser — your files are never uploaded to any server. When you close the tab, everything is gone. This makes it safe for confidential documents, client work, and personal photos.
Does the PDF merger work on mobile phones?
Yes. It's built mobile-first and works on any modern phone browser — iPhone (Safari) and Android (Chrome) included. You can pick files straight from your camera roll and download results directly to your device.
Do I need to install any software to use the PDF merger?
No. The PDF merger runs entirely in your web browser — no downloads, extensions, or signup. Open the page, use the tool, download your result. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.