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Merge PDF

Combine multiple PDF files into one. Free online PDF merger - drag, reorder, and merge. No upload, no sign-up.

Drop PDF files here

or click to browse - add as many as you need

What Is a PDF Merger?

A PDF merger (also called a PDF combiner or PDF joiner) combines multiple PDF files into a single document. Instead of sending multiple attachments or managing separate files, you get one clean, unified PDF that's easier to share, print, and archive.

Our free online PDF merger uses the open-source pdf-lib JavaScript library to combine your files entirely in your browser. Your PDFs are never uploaded to any server - the merging happens locally on your device, making it 100% private and secure. There are no file size limits, no watermarks, and no sign-up required.

You can merge as many PDFs as you need. Drag and drop the file cards to reorder them before merging - the final PDF will follow the order you set. All text, images, fonts, hyperlinks, and formatting are preserved at full quality.

Common use cases include combining scanned documents, merging report chapters, joining invoice pages, assembling portfolio PDFs, and consolidating form submissions.

How to Merge PDF Files

  1. Add your PDF files

    Click "Select PDF Files" or drag and drop multiple PDFs into the upload area. You can add more files after the initial selection.

  2. Reorder if needed

    Drag the file cards up or down to set the order. The merged PDF will follow this sequence.

  3. Click Merge PDFs

    The tool combines all files in your browser. A progress bar shows the merging status.

  4. Download your merged PDF

    Click "Download Merged PDF" to save the combined file to your device.

Frequently Asked Questions

How do I merge PDF files online for free?

Upload your PDF files using the file picker or drag and drop. Reorder them if needed by dragging the file cards. Click "Merge PDFs" and download the combined file. The entire process happens in your browser - no files are uploaded to any server.

Is there a file size limit for merging PDFs?

There is no strict file size limit since processing happens entirely in your browser. However, very large PDFs (over 100MB total) may be slow depending on your device's memory. For best performance, keep total file size under 50MB.

How many PDF files can I merge at once?

You can merge as many PDF files as you need. There is no hard limit on the number of files. The tool processes them all in your browser.

Will the merged PDF lose quality?

No. The merger combines your PDFs at the binary level using pdf-lib, preserving all text, images, fonts, and formatting at full quality. No re-encoding or compression is applied.

Are my PDF files uploaded to a server?

No. This tool uses the pdf-lib JavaScript library to merge PDFs entirely in your browser. Your files never leave your device, ensuring complete privacy.

Can I reorder pages before merging?

Yes. You can drag and drop the file cards to reorder the PDFs before merging. The files will be combined in the order shown.

Does this work with password-protected PDFs?

Password-protected PDFs cannot be merged without first removing the password. If you try to merge a protected PDF, the tool will show an error for that file.

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