Merge PDF

Key Features

Merge Multiple PDFs

Add two or more PDF files and combine every page into one document without manually copying or re-exporting the content.

Control File Order

Arrange the source files in the order they should appear. The first file becomes the first section of the merged PDF.

One Combined PDF

Download a single standard PDF containing the pages from all selected source files in sequence.

Original Files Stay Safe

Merging creates a separate output PDF and does not overwrite, delete, or modify the source files on your device.

Private & Local

Merging runs entirely in your browser using PDF.js and WebAssembly. Your PDFs are never uploaded to any server.

How to Use

Add PDFs

Drag and drop or select two or more PDF files. Add them in any order, then review the list before merging.

Arrange the File Order

Set the source-file order so the first file contains the first pages of the output, followed by the remaining files.

Merge and Download

Run the tool to combine all pages into one PDF, then download the new document. The original files remain unchanged.

How to Merge PDF Files

Why Merge PDF Files

Related documents are often stored as separate PDFs: a cover page, report sections, appendices, invoices, scanned pages, or supporting exhibits. Combining them into one file makes the complete document easier to share, print, review, and archive.

How It Works

Add two or more PDF files and arrange them in the order you want. The tool copies the pages from the first file, then the second, and continues through the list until it creates one new PDF. The original files are not overwritten or changed.

Choose the Correct File Order

The source-file order determines the section order in the final document. For example, place cover.pdf first, followed by report.pdf, then appendix.pdf. Review the list before merging so the output begins and ends with the intended files.

Common Use Cases

Use Merge PDF to:

Combine separate report sections into one complete document.
Join a contract with exhibits, appendices, or signature pages.
Merge scanned pages that were saved as separate PDF files.
Combine invoices, receipts, or expense records into a monthly archive.
Assemble a portfolio, application package, or project submission.
Join a cover letter, résumé, and references into one application PDF.

Page Sizes and Output Quality

PDF merging combines document pages instead of taking screenshots or converting the pages to ordinary images. Text generally remains selectable, and source page dimensions are retained. If the input files use different sizes, such as A4 and Letter, the output may contain mixed page dimensions. Standardize the source files first if a uniform page size is important.

Document Features and Signatures

A new PDF is created during the merge. Page content is generally copied, but bookmarks, forms, annotations, attachments, links, metadata, and other document-level features may not transfer exactly. Existing digital signatures should be treated as invalid after the document is rebuilt.

Large Files

Because processing happens locally, the practical limit depends on the available memory of your device and browser. Large documents or many high-resolution PDFs may take longer to process. Closing unused tabs and merging files in smaller groups can help reduce memory pressure.

Privacy

Everything runs locally in your browser using PDF.js and WebAssembly. Your files are never uploaded to a server, so you can merge private contracts, financial records, internal reports, or scanned documents on your own device.

Limitations

This tool merges complete PDF files in file order. It does not provide page-level drag-and-drop editing, selective page ranges from each source, compression, OCR, or automatic repair of damaged PDFs unless those capabilities are added separately.

Extract PDF Pages → Rotate PDF → Resize PDF Pages →

Frequently Asked Questions

Are my PDFs uploaded?

No. Merging happens locally in your browser using PDF.js and WebAssembly. Your PDFs never leave your device and are not sent to any server.

How many PDFs can I merge?

You can add multiple PDFs at once. The practical limit depends on your device memory, total file size, and total page count because the merge runs locally in your browser.

Does the file order matter?

Yes. The merged PDF follows the source-file order. Arrange the files before merging so the first file becomes the first section of the output.

Can I reorder individual pages from different PDFs?

This tool orders complete PDF files. It does not provide page-level rearrangement across source files. Use a page extraction or page reordering tool if you need to place individual pages in a custom sequence.

Does merging change my original files?

No. The tool creates a new merged PDF and leaves every source file on your device unchanged.

Will bookmarks, links, forms, or annotations survive?

Page content is copied into a new document, but document-level and interactive features may not transfer exactly. Check the merged result if bookmarks, forms, annotations, attachments, or links are important.

Will merging invalidate digital signatures?

It can. Creating a new PDF generally invalidates existing cryptographic signatures or means the signatures no longer apply to the final document. Do not merge signed files if their signatures must remain valid.

Does merging reduce PDF quality?

The tool combines PDF pages rather than converting them into images. Text normally remains selectable, but compatibility and document-level features can vary by source file. Always review the output before distribution.

Can I merge password-protected PDFs?

The source PDFs must be openable by the tool. Password-protected or encrypted files may need to be unlocked with the correct password before merging. This tool does not bypass encryption.

Can I merge PDFs with different page sizes?

Yes, but the output may contain mixed page dimensions if the source files use different sizes, such as A4 and Letter. Standardize the pages first if you need a uniform document.