Merge PDF
Merge multiple PDF documents into a single file for free online. Fast, private, browser-based PDF merger with no file size limits.
How to use Merge PDF
- Click the upload area or drag and drop two or more PDF files from your device.
- Drag and reorder the selected PDF file thumbnails into your preferred sequence.
- Click "Execute Merge PDF" to combine all selected documents into one PDF file.
- Click "Download Output File" to save your merged document instantly.
Technical Details & Specifications
The merge algorithm uses pdf-lib to load object trees, copy document pages across PDF references, re-index object catalogs, and assemble a new consolidated PDF binary stream directly in browser RAM.
Frequently Asked Questions
Are my files uploaded to a server when merging PDFs?
AllPDFTool's Merge PDF tool operates 100% client-side in your browser memory; your documents are never uploaded to remote servers or stored on external databases.
Is there a limit on file size or the number of PDFs I can merge?
AllPDFTool places no artificial file size caps or daily usage limits on the Merge PDF tool, allowing you to combine as many files as your device memory permits.
Does this tool work on mobile devices and tablets?
AllPDFTool's Merge PDF tool works seamlessly on modern mobile, tablet, and desktop web browsers including Chrome, Safari, Firefox, and Edge.
Can I reorder the pages or files before merging?
AllPDFTool allows you to drag, reorder, and arrange file sequence using up and down controls before executing the merge operation.