Merge PDF Files Online
Join multiple PDF files into one single document with custom ordering. Completely private in your browser.
Select PDF files to merge
Select 2 or more PDF documents
Arrange Document Order
How to Merge PDF Files Online for Free
Merging PDF files is useful when you need to combine invoices, contracts, chapters, or scanned documents into a single, easy-to-share file. Fixlytools PDF Merger combines multiple PDF documents inside your browser using JavaScript — your files are never uploaded to any server.
- Select Your PDF Files: Click "Choose PDF Files" and select two or more PDF documents from your device. You can also add more files after the initial selection.
- Arrange the Order: Use the up and down arrows next to each file to set the order in which they should appear in the merged document.
- Merge: Click "Merge All PDFs" and the tool combines your documents into one single PDF file in seconds.
- Download: Click the download button to save your merged PDF. The output file is downloaded directly to your device.
Key Features
- No Fixed Size Limit: The tool is limited only by your device memory.
- Custom Page Order: Move files up or down before merging to control the exact page sequence.
- Preserves PDF Quality: The merge operation does not re-encode or compress your PDF content. Text, images, and formatting remain intact.
- In-Browser Processing: Powered by the pdf-lib JavaScript library running entirely in your browser. No cloud servers involved at any point.
- Free & Private: No sign-up required. Your confidential documents stay on your device throughout the process.
Frequently Asked Questions
How many PDF files can I merge at once?
You can merge as many PDF files as your device memory allows. There is no hard limit set by the tool. Typically, merging up to 20–30 documents works smoothly on most computers.
Will the merged PDF preserve all original formatting?
Yes. The tool uses pdf-lib to combine PDF files at the binary level, which means text, images, fonts, hyperlinks, and page layouts are all preserved exactly as they are in the source files.
Can I merge password-protected PDFs?
Password-protected (encrypted) PDFs cannot be merged. You need to remove the password protection first using the original application or a PDF editor before merging.
Are my PDF files uploaded to any server?
No. All processing is done locally in your browser using JavaScript. Your documents never leave your device.
Can I reorder the pages after merging?
This tool merges entire documents in the order you arrange them. For advanced page-level reordering after merging, you would need a dedicated PDF editor.