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Merge PDF Files

Merge multiple PDF files into one document directly in your browser.

Runs locally in your browser — no upload.

How to Merge PDF Files Online

Combining multiple PDF files into a single document is a common need. Whether you are assembling a report from several sections, combining invoices into one file, or putting together a collection of documents for review, a PDF merger saves you from manually copying and pasting between files.

This PDF merger combines multiple files into one document directly in your browser. Upload your files, arrange them in the order you want and download the merged result. Everything happens locally — your documents never leave your device.

How to Use This Tool

  1. Add files — click Choose files or drag multiple PDFs into the upload area.
  2. Arrange the order — use the arrow buttons to move files up or down in the list.
  3. Merge — click the Merge PDFs button to combine them.
  4. Download — save the merged PDF to your device.
  5. Start over — click Start over to merge a new set of files.

Arranging File Order

The order of files in the list determines the order of pages in the merged document. You can:

  • Move a file up — click the up arrow to move it earlier in the sequence.
  • Move a file down — click the down arrow to move it later in the sequence.
  • Remove a file — click the X button to remove it from the merge.

The first file in the list becomes the first pages of the merged document, and so on.

What the Tool Shows

For each file you add, the tool displays:

  • File name — so you can identify each document.
  • File size — to help you stay within limits.
  • Page count — so you know exactly how many pages each file contributes.

How Merging Works

The tool uses the pdf-lib library to copy pages from each source PDF into a new combined document. Pages are copied exactly as they are — no re-encoding, no quality loss. The result is a single PDF that contains all pages from all files in the order you specified.

Common Use Cases

  • Combining chapters or sections of a report
  • Merging invoices or receipts into one file
  • Assembling a collection of documents for submission
  • Joining related PDFs for easier navigation

Merged file too big to share? Compress the result before sending it. Need the combined content in an editable format? Convert the merged PDF to Word and keep editing from there.

Privacy

Your files are processed entirely in your browser. No PDF content is ever uploaded to a server. The merging happens using JavaScript and the pdf-lib library, keeping your documents completely private.

Frequently Asked Questions

Free users can merge up to 3 PDF files at once, while Pro supports up to 50 files per operation. If you need to merge more files on the Free plan, you can combine them in batches — merge the first group, then merge that result with the remaining files.

Yes. Use the up and down arrow buttons next to each file to rearrange the order. The merged PDF will follow the exact order shown in the list.

No. Merging simply combines the pages from each PDF into a new document. The pages are copied as-is without re-encoding or compression, so the content and quality of each page remain exactly the same.

Yes. Free users can add files up to 20 MB each, and Pro users up to 200 MB each. The total merged file may be larger depending on how many files you combine. Very large merged files may take longer to process in the browser.

Add your PDFs to this merger, drag them into the order you want with the arrow buttons, and click Merge PDFs. The tool stitches every page into a single document in that exact order, which you then download — no software to install and no account needed.

Yes. This merger runs entirely in your browser and covers the core Acrobat workflow — combining files and arranging page order — for free. Because pages are copied without re-encoding, the merged output keeps the original quality of every source file.

Yes, completely free. There are no limits, no watermarks and no account required. You can merge as many sets of PDFs as you like.

No. Your PDFs are processed entirely in your browser. Nothing is ever sent to a server, so your documents stay on your device.

PDFs with an owner password (restricting editing) may be processed. However, PDFs that require a password to open cannot be merged without first unlocking them.

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