How to Merge PDF Files Online Free (Step-by-Step)

When You Need to Merge PDFs

Whether you're combining invoices, assembling a report from multiple sources, or creating a unified document from scanned pages, merging PDFs is one of the most common document tasks.

Step-by-Step Guide

1. Open the PDF Merger tool: Navigate to our PDF Merger — no account or download needed.
2. Upload your files: Drag and drop PDF files onto the upload zone, or click to browse. You can add up to 20 PDFs.
3. Reorder if needed: Drag the file cards to rearrange the order. Files are merged top-to-bottom.
4. Click Merge: Hit the merge button. Processing happens entirely in your browser.
5. Download: Your merged PDF is ready to download instantly.

Privacy & Security

Unlike most online PDF tools, our merger processes everything in your browser using the pdf-lib library. Your files never leave your device, and we never see or store your documents.

Tips for Better Results

• Make sure all PDFs are not password-protected, or remove passwords before merging.
• For large documents (50+ pages), give the tool a few seconds to process.
• The merged PDF preserves all formatting, fonts, and images from the originals.