Merge PDF Files — Combine PDF Documents
Combine multiple PDF files into a single document. Drag to reorder pages, optionally preserve bookmarks for each file. All processing stays in your browser, no upload required.
Key Features
Combine Multiple PDFs
Merge any number of PDF files into a single document using pdf-lib. All pages are combined in the order you specify, preserving original content and formatting.
Drag & Drop Reorder
Easily reorder files before merging with intuitive drag-and-drop. Use move up/down buttons for precise control. Files are merged exactly in the order shown.
Bookmark Preservation
Optionally create bookmarks for each merged file, making it easy to navigate the combined document. Each bookmark points to the first page of its source file.
100% Private & Secure
All merging happens locally in your browser using pdf-lib. Your PDF files never leave your device — no uploads to any server, complete privacy.
No Installation Required
No software to download or install. The entire merger runs in your browser — works on any device with a modern browser.
About This PDF Merger
Our PDF Merger uses pdf-lib to combine multiple PDF documents into a single file entirely in your browser. Simply upload the files you want to merge, drag them into your preferred order, optionally enable bookmark preservation, and click Merge. pdf-lib copies all pages from the source files into a new document while preserving original content, formatting, and structure. The bookmark option creates outline entries in the merged PDF, each pointing to the first page of its source file — perfect for navigating large combined documents. All processing stays local in your browser — no data is ever uploaded. No sign-ups, no file size limits, no hidden charges.
How to Merge PDF Files — Step by Step
Merging PDF files with our tool is simple:
Upload PDF Files
Drag and drop two or more PDF files onto the upload area, or click to browse and select files. You can add multiple files at once.
Reorder Files
Drag files into your preferred order using the drag handle, or use the up/down arrow buttons. The files will be merged exactly in the order shown.
Configure Options
Toggle the Preserve Bookmarks option if you want bookmark entries created for each merged file. This helps with navigation in large combined documents.
Merge and Download
Click the Merge PDFs button to combine all files. The merged document is generated locally and ready to download immediately as merged.pdf.
Important Notes
This tool merges PDF files using pdf-lib, which copies pages from source files into a new document. All pages are preserved in their original format. Encrypted PDFs cannot be processed — please decrypt them first. The bookmark option adds outline entries for each file; these may not be supported by all PDF readers. The maximum number of files depends on your device's available memory, as all files are processed locally in the browser.