Merge PDF

Combine multiple PDF files into one document for free. Reorder pages, preview file details, and download the merged result. No upload — everything runs in your browser.

Drop PDF files here or click to upload

Select multiple PDF files to merge

What Is the PDF Merger?

The PDF Merger lets you combine multiple PDF files into a single document directly in your browser. Upload your files, arrange them in the order you want, and merge them with one click. No server upload, no signup, completely private.

How to Merge PDFs

  • Upload PDF files by clicking the upload area or dragging and dropping.
  • Review the file list — each file shows its name and page count.
  • Reorder files using the up/down buttons or by dragging them into position.
  • Remove any files you do not want included.
  • Click the Merge button to combine all files into one PDF.
  • Download the merged result.

Tips for Best Results

  • Make sure your PDFs are not password-protected — encrypted files may fail to load.
  • The final page order matches the file list from top to bottom.
  • You can add more files at any time before merging.
  • For very large files, give the merge process a moment to complete — a progress bar will show the status.

Frequently Asked Questions

How does the PDF merger work?+
The tool uses the pdf-lib library to read each PDF file entirely in your browser, then combines all pages into a single new PDF document. No files are uploaded to any server — everything runs locally on your device.
Is there a limit to how many PDFs I can merge?+
There is no hard limit. You can merge as many PDF files as your browser's memory allows. For very large files (hundreds of megabytes total), performance may vary depending on your device. Most users can comfortably merge dozens of PDFs at once.
Can I reorder the PDFs before merging?+
Yes. After uploading your files, you can use the up and down arrow buttons next to each file to rearrange the order. The final merged PDF will follow the order shown in the file list from top to bottom.
Are my PDF files uploaded to a server?+
No. All processing happens entirely in your browser using JavaScript. Your PDF files never leave your device, making this tool completely private and secure. There is no server-side processing involved.
What types of PDFs are supported?+
The tool supports standard PDF files including text documents, scanned documents, forms, and PDFs with images. Password-protected or encrypted PDFs may not work unless they are unencrypted first. The tool handles PDF versions up to 2.0.
Will the merged PDF preserve bookmarks, links, and form fields?+
The merge copies all pages with their visual content intact, including text, images, and vector graphics. However, interactive features like bookmarks, hyperlinks, and fillable form fields may not be preserved in the merged output.

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