Merging PDF files seems like it should be simple. Open two documents, combine them, save. But most free PDF mergers impose artificial limits — maximum 10 pages, 50MB upload cap, or a watermark on the output. Paid tools solve this but cost $10-20/month.
This guide shows how to merge PDF files using the NexaTools PDF Merger, which runs entirely in your browser with no file size limits, no uploads, and no watermarks.
Why Client-Side PDF Merging is Better§
When you upload PDFs to a server-based tool for merging, you're sending potentially sensitive documents — contracts, resumes, legal filings — to an unknown server. A client-side merger reads and processes the PDFs in your browser's memory. The files never leave your computer.
Additionally, client-side merging has no practical file size limit. A 2GB PDF is handled the same as a 100KB one — as long as your browser has enough memory. Server-based tools typically cap files at 50-100MB to control their bandwidth costs.
How to Merge PDFs in Your Browser§
- Add PDF files — drag and drop PDFs into the upload area, or use the file picker to select multiple files
- Reorder pages — each PDF appears as a card with its filename and page count. Drag cards to rearrange the merge order
- Optional: select page ranges — instead of merging the whole file, specify page ranges (e.g., "1-5" extracts only pages 1 through 5)
- Merge — click the merge button. The tool processes the files locally and offers the combined PDF for download
Supported Input Formats§
The merger accepts standard PDF files. For non-PDF files (images, Word documents, text files), convert them to PDF first using the Images to PDF tool or your operating system's print-to-PDF function.
Page Range Syntax§
1-5— pages 1 through 53— page 3 only5-— page 5 to end-3— first 3 pages1,3,5— pages 1, 3, and 5
What Happens to Bookmarks and Metadata§
When you merge PDFs, the resulting document preserves the content and formatting of each page. Bookmarks from the individual source files are preserved and appended in order. Document metadata (title, author, subject) from the first file is carried over to the merged output.
Comparison with Other Free PDF Mergers§
Most free online PDF mergers have significant restrictions. Some limit you to 10MB per file. Others allow only 5 files per merge. Many add a watermark or require creating a free account. Server-based tools also require uploading, which means your documents pass through their infrastructure.
The NexaTools PDF Merger has no limits on file count, file size, or pages. No watermark is added. No account is required. And because everything runs locally, your documents never leave your device.
Summary§
The NexaTools PDF Merger lets you combine PDFs of any size for free, entirely in your browser, with drag-and-drop reordering and page range selection.