About Merge PDF Files

Combining multiple PDF documents into a single unified file is one of the most frequently needed document tasks across business, academic, and personal contexts. Whether you're assembling a project report from multiple chapters, consolidating invoices for accounting, or gathering scanned pages into one archive, LocalPDF's Merge PDF tool makes this fast and straightforward.

The entire merge operation happens inside your web browser using pdf-lib, a powerful client-side PDF manipulation library. No files are ever sent to a remote server. This is especially important when working with confidential documents such as financial statements, legal contracts, medical records, or personal identification, where privacy and data security are critical.

You have full control over the order in which files are merged. Simply drag and reorder the documents in the file list before clicking the merge button. The output file preserves all page content, embedded fonts, and hyperlinks from the source documents.

How to Use

  1. 1Click "Select PDF Files" or drag multiple PDFs into the upload area.
  2. 2Rearrange the files into your desired order using drag-and-drop.
  3. 3Click the "Merge PDF" button to combine all files into one.
  4. 4Download the resulting merged PDF to your device.

Key Features

Drag-to-Reorder

Rearrange the order of your PDF files freely before merging. Your desired page sequence is respected exactly.

Unlimited Files

Merge as many PDF files as you need in a single operation. There are no caps on the number of input documents.

Preserves Formatting

All fonts, images, hyperlinks, and page layouts from the source files are preserved intact in the merged output.

No Account Required

Use the merge tool immediately without creating an account, signing up, or providing any personal information.

Frequently Asked Questions

How many PDFs can I merge at once?

There is no hard limit. You can merge as many PDFs as your browser can handle in memory. For very large batches (20 or more large files), we recommend merging in smaller groups first, then combining the results.

Will the page order be exactly as I specify?

Yes. The output PDF follows the order you arrange in the file list. You can drag and drop files to set the exact sequence before merging.

Are bookmarks and hyperlinks preserved after merging?

Internal hyperlinks and most embedded metadata are preserved. Cross-document bookmarks may not carry over, as they reference specific file paths that no longer apply in the merged document.

Can I merge password-protected PDFs?

Password-protected PDFs need to be unlocked first before merging. Use our Unlock PDF tool to remove password protection, then proceed with the merge.

Does merging PDFs affect their quality?

No. Merging does not re-compress or re-render any content. The pages from each source file are inserted directly into the output, maintaining full original quality.