How to Merge PDF Files Online for Free
Whether you're combining a CV with a cover letter, assembling bank statements for a loan application, or creating a single document from multiple reports — merging PDFs is a daily task. Here's how to do it quickly, for free, without uploading sensitive files to third-party servers.
Why Merge PDFs?
The most common reasons to combine multiple PDFs into one file:
- Job applications that require all documents (CV, cover letter, portfolio) as a single PDF
- University admissions portals that accept only one file upload
- Bank loan applications requiring multiple statements combined
- Combining scanned pages from a multi-page document
- Creating a single PDF from multiple invoice or receipt files
- Assembling a report from sections written separately
How to Merge PDFs Online (Step by Step)
Our Merge PDF tool runs entirely in your browser. Your files are never uploaded to any server — the merging happens locally using the PDF-lib JavaScript library.
- Open the Merge PDF tool
- Click Add PDFs or drag your files onto the drop area — you can upload multiple files at once
- Drag the files in the list to set the order they'll appear in the merged document
- Click Merge PDFs
- Download the combined PDF file
💡 Check the page order before merging. Drag files in the correct sequence — re-merging after downloading is the only fix if the order is wrong.
Merge PDFs on Windows
Windows doesn't have a built-in PDF merge tool, but there are free options:
Microsoft Edge (built-in)
Open the first PDF in Edge. Right-click → Print → Microsoft Print to PDF. This only handles one file at a time, so it's not ideal for merging.
Adobe Acrobat Reader (free)
The free Reader cannot merge PDFs — only Adobe Acrobat Pro (paid) or the online Adobe tools can. Use a browser-based tool instead.
PDFsam Basic (free desktop app)
PDFsam is a free, open-source desktop application for merging, splitting, and rotating PDFs on Windows, Mac, and Linux.
Merge PDFs on Mac
macOS Preview can merge PDFs without any additional software:
- Open the first PDF in Preview
- Open the sidebar (View → Thumbnails)
- Drag additional PDF files from Finder into the sidebar at the position you want them inserted
- Go to File → Export as PDF and save the combined file
This works well for a small number of files. For larger merges, a dedicated tool is faster.
After Merging: Reduce File Size
Merged PDFs can be large — especially if the component documents contain scanned images. Before submitting to a portal or emailing, run the merged PDF through the Compress PDF tool to reduce file size.
Image-heavy merged PDFs typically compress by 40–70%. A 20 MB merged file can come down to 5–8 MB without visible quality loss at normal reading size.
Password-Protected PDFs
Most PDF merge tools cannot process password-protected files — the tool needs to read the pages, which requires the password. If you receive a locked PDF you own, remove the password first, then merge. If you don't have the password, you cannot legally process the file.
All PDF tools — free, private, browser-based
Your files never leave your device.