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PDF Merger

Merge multiple PDF files into one. Upload your PDFs, drag to reorder, and download the combined file — all in your browser, nothing sent to any server.

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Click to upload PDF files or drag & drop

PDF files only — up to 10 files

About PDF Merger

PDF Merger combines multiple PDF files into a single document, entirely inside your browser using the pdf-lib library. Your files are never uploaded to any server — all processing happens locally. Supports up to 10 PDF files per merge.

How to Use PDF Merger

  1. Upload two or more PDF files using the upload zone or drag & drop.
  2. Each file card shows the file name, size, and page count.
  3. Drag the cards to arrange the order — pages from the first card appear first in the merged PDF.
  4. Click Merge PDFs. A progress bar shows while the files are being combined.
  5. The merged PDF downloads automatically as merged.pdf.

How It Works

PDF Merger uses the open-source pdf-lib library loaded from a CDN. It reads each PDF's pages entirely in your browser memory, copies all pages into a new document in the order you specify, then generates a download — no file ever leaves your device.

Example

You have three separate PDF files: a cover letter, a resume, and a portfolio. Upload all three, drag them into the correct order (cover letter first, then resume, then portfolio), and click Merge PDFs. The result downloads as a single merged.pdf ready to attach to a job application.

Frequently Asked Questions

No. All processing happens locally in your browser using the pdf-lib JavaScript library. Your files are never sent to any server.

Up to 10 PDF files per merge. If you need to merge more, merge in batches and then merge the resulting files together.

Yes — basic content (text, images, graphics, and page layout) is preserved. Complex features like interactive forms, bookmarks, and digital signatures may not be fully retained after merging.

The tool attempts to load password-protected PDFs in a compatibility mode but may not be able to merge them. Remove the password protection first using your PDF reader before uploading.

The merged file is always saved as merged.pdf. You can rename it after downloading using your operating system's file manager.