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NJHTools

Merge PDF Files

Merge PDF files free in your browser: combine several PDFs into one document, in any order and with only the pages you need. No upload, no signup, no watermark.

Your PDF never leaves your device. It is processed locally in your browser, not uploaded to any server.

How to verify: open DevTools → Network, then use the tool. No request carries your file.

Drag PDF files here, or click to choose

Processed on your device. Your files are never uploaded.

How to merge PDF files

  1. Drag two or more PDF files onto the drop zone, or click it to choose them.
  2. Put the files in order by dragging a row, or with the ↑ and ↓ buttons.
  3. Optionally type a page range for a file (for example 1-3, 5) to include only those pages.
  4. Click Merge PDF. The combined file downloads as merged.pdf.

Combine PDFs without uploading them

Many online PDF mergers send your documents to a server, and some pass them on to third-party services. This tool loads each file into your browser's memory, copies the pages with the open-source pdf-lib library, and saves the result straight to your device. Contracts, payslips, and scans stay on your computer. You can check this yourself: open your browser's DevTools, go to the Network tab, and merge a file. No request contains your PDF.

It works the same for Korean users looking for a free PDF 합치기 tool: drop the files, set the order, and download one combined PDF.

Page ranges, limits and tips

  • Ranges accept single pages and spans: 2, 4-7, 9- (to the end), or 5-1 (reversed).
  • Page content, images and fonts are copied exactly, without re-compression. The bookmarks panel (outline) and fillable form fields of the source files are not carried over, so fill in and save forms before merging.
  • Password-protected or encrypted PDFs can't be merged. Remove the password in the original app first.
  • Everything happens in memory, so very large jobs (hundreds of MB) depend on your device. On phones, merge in smaller batches.
  • To rearrange or delete individual pages after merging, open merged.pdf in Organize PDF. To pull pages back out, use Split PDF. Browse every tool in the PDF tools collection.

Frequently Asked Questions

How do I merge PDF files into one?↓

Drop your PDF files onto the merger, arrange them in the order you want, and click Merge PDF. The combined document downloads as merged.pdf. It takes a few seconds for typical files.

Is it safe to combine PDFs online with this tool?↓

Yes. The PDFs are merged inside your browser and are never uploaded to a server or shared with third parties. To verify, open your browser's DevTools, switch to the Network tab and merge a file: no request carries your document.

Can I merge only some pages of a PDF?↓

Yes. Each file has a Pages box where you can type a range such as 1-3, 5 or 10- (page 10 to the end). Only those pages, in that order, go into the merged PDF. Leave the box empty to include all pages.

Is there a limit on the number or size of PDFs?↓

There is no fixed limit and no daily quota. Because merging happens in your device's memory, the practical limit depends on your computer or phone. Desktop browsers cope with large jobs best; on phones, merge in smaller batches.

Can I merge password-protected PDFs?↓

No. Encrypted or password-protected PDFs are detected and skipped with a message. Open the file in the app that created it, remove the password or save an unprotected copy, then merge that copy.

Does merging reduce the quality of my PDFs?↓

No. Pages are copied as they are, including text, vector graphics, fonts and images, without re-compression, and no watermark is added. The merged file is usually about the size of the source files combined. Bookmarks (the outline panel) and fillable form fields are not carried over, so fill in and save forms before merging.

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