QQudo Tools

Merge PDF Files

Combine multiple PDF files into one document. All processing happens locally in your browser.

Local Processing · No Upload · Auto Cleanup

Drag & drop PDF files here

or click to select files

Browse Files

Supports multiple PDF files

About Merge PDF

This tool lets you combine multiple PDF files into a single document directly in your browser. Unlike other online PDF mergers, your files never leave your device. All processing is done locally using WebAssembly-powered PDF libraries, ensuring maximum privacy and speed.

How to Use

  1. Click the upload area or drag PDF files into it.
  2. Add more files if needed. You can reorder them by dragging.
  3. Optionally change the output file name.
  4. Click "Merge PDF" to combine all files.
  5. Download the merged PDF file.

Privacy and Security

Your PDF files never leave your device. All merging is performed locally in your browser. We do not record file names, file contents, file hashes, merge results, or document metadata. After you close or refresh the page, all data is automatically released.

Frequently Asked Questions

Is this PDF merger really free?▼
Yes, it is completely free with no registration required. There are no file size limits or daily usage limits.
Are my PDF files uploaded to a server?▼
No. All PDF processing happens entirely in your browser. Your files never leave your device.
What is the maximum file size?▼
Since processing happens in your browser, the limit depends on your device’s available memory. For best performance, we recommend keeping total file size under 200 MB.
Can I merge password-protected PDFs?▼
No. Password-protected or encrypted PDFs cannot be processed. You need to remove the password protection first.
Will the merged PDF maintain the original quality?▼
Yes. The merge operation copies pages directly without re-rendering, so there is zero quality loss.
Does it work on mobile phones?▼
Yes, the tool works on both desktop and mobile browsers that support modern web standards.

Your PDF files never leave your device. All merging is performed locally in your browser. We do not record file names, file contents, file hashes, merge results, or document metadata. After you close or refresh the page, all data is automatically released.