PDF Merger

About this tool

Combining multiple PDF documents into a single file is a common need for professionals, students, and anyone managing digital documents. Our PDF Merger uses the pdf-lib library to join PDFs while preserving formatting, fonts, images, and page layouts from each source file. The merging process runs entirely in your browser — your documents never leave your device, which is critical for handling contracts, financial statements, medical records, or any sensitive materials. You can reorder files before merging by dragging and dropping, ensuring pages appear in your desired sequence. There's no limit on the number of PDFs you can combine, and the tool handles both simple text documents and complex files with embedded media.

How to use PDF Merger

1. Upload multiple PDF files by clicking the upload area or dragging them all at once.
2. Drag and drop to reorder the PDFs in the sequence you want them merged.
3. Click the 'Merge PDFs' button to combine all files into a single document.
4. Download your merged PDF file to your device.

Tips & best practices

• Reorder files before merging to ensure pages appear in the correct sequence.
• There's no strict limit on the number of PDFs—merge as many as needed.
• The merged file preserves the original quality of all input PDFs.
• File size of the output is approximately the sum of all input file sizes.

Common use cases

• Combining multiple invoices or receipts into a single document for record-keeping.
• Merging chapters or sections of a report into a complete document.
• Creating portfolios by combining multiple certificate or resume PDFs.
• Assembling documentation packages by merging forms, contracts, and attachments.

Privacy

This tool runs entirely in your browser. We do not upload, store, log, or process your input on any server. Open your browser's DevTools Network tab to verify — there is no outbound request with your data. See our Privacy Policy for details.