Merge PDF
Drag & drop PDF files or click to upload
Select multiple PDF files to merge
Combine multiple PDF files into one document instantly in your browser. Drag and drop to reorder pages. No file uploads to servers.
How to Use Merge PDF
- Drag and drop multiple PDF files or click to upload them.
- Review the list of files and their order.
- Remove any unwanted files using the remove button.
- Click "Merge PDFs" to combine them into one document.
- Download the merged PDF.
What is PDF Merging?
PDF merging combines two or more PDF documents into a single file. Each source file's pages are appended sequentially into one consolidated document. This is one of the most frequently needed PDF operations, essential for assembling reports from multiple sections, combining scanned pages, or packaging related documents for submission. This tool processes everything in your browser using JavaScript, so your files remain completely private and are never uploaded to any server.
How It Works
The tool uses the pdf-lib library to load each PDF file, extract all of its pages, and copy them into a new document in the order you specify. Page dimensions, orientations, and content are preserved exactly as they appear in the originals. Internal links, form fields, and annotations within each source file are maintained. The merged output is generated as a single PDF file ready for download. Processing happens entirely client-side, with performance depending on the total size of the files and your device's available memory.
Common Use Cases
- Combining chapters or sections into a complete document
- Assembling multi-page scanned documents from individual page files
- Merging cover letter and resume into a single application PDF
- Consolidating monthly reports into quarterly or annual compilations
- Packaging invoices, receipts, and supporting documents together
Tips for Merging PDFs
Upload files in the order you want them to appear in the merged document. If the merged file is too large for your needs, run it through the Compress PDF tool afterward to reduce the size. For documents with mixed orientations (portrait and landscape pages), the merger preserves each page's original orientation. Need to do the reverse? Use the Split PDF tool to extract individual pages. You can also add page numbers with Add Page Numbers or convert to images with PDF to Image.