PDFToolkit

Organize PDF

Live tool

Merge PDF Files

Add two or more PDFs, arrange them in the order you want, and download a single merged PDF.

InputPDFOutputPDFLimit25 MB per filePagesUp to 100ProcessingBrowser processing

Core tools can be used without creating an account.

Supported formats and limits are shown before processing.

Processed locally in your browser. Your file is not uploaded to our server.

Updated 2026-07-08. This workflow is processed locally in the browser and has passed the core file, processing, and download check.

Choose files

PDF - up to 25 MB

PDF

Browser processing limit

Files stay on your device. The result is created in this browser session.

  • Encrypted or damaged PDFs may fail validation.
  • Bookmarks and advanced outlines may not be preserved.

Choose files to process locally

or click to choose from your device

No files selected yet.

Status: Waiting for files

  1. Reading file
  2. Validating PDF
  3. Processing locally
  4. Creating result
  5. Ready

Files stay on your device. The result is created in this browser session.

File order

The merge follows the order shown in the file list.

Use the up and down controls before processing.

Different page sizes are preserved in the merged PDF.

Open the result and check section order before sharing.

Merge limits

Merged PDFs keep the source pages in the order shown. Encrypted, damaged, or unusually large PDFs may fail validation before merging.

  • Encrypted or damaged PDFs may fail validation.
  • Bookmarks and advanced outlines may not be preserved.

Merge steps

  1. Choose two or more PDF files from your device.
  2. Review file names, page counts, and the order shown in the queue.
  3. Merge locally and download the combined PDF from this browser session.

Result checks

The selected PDFs are read and merged in the browser. File contents are not sent to the PDFToolkit server for this tool.

  • The file order is visible before processing.
  • Unsupported or encrypted files return clear errors.
  • The result is created in the current browser session.

Related tools

Split PDFExtract selected pages or plan page ranges from a PDF.Number PagesAdd visible page numbers to PDF pages for references, packets, and print-ready documents.Compress PDFReduce PDF file size for email, forms, and online uploads with clear compression choices.

Helpful guides

How to merge PDF files safely onlineMerge PDF files locally in the browser and check order, page count, forms, links, and sensitive documents before sharing.How to compress a PDF for emailPractical steps for reducing a PDF attachment without making it hard to read.

Merge PDF FAQ

Can I change the order before merging?

Yes. Use the up and down controls in the file queue before starting the merge.

How many PDFs can I merge?

Use small batches within the displayed file size and page limits for the most reliable result.

Will bookmarks be preserved?

Page content is the priority. Complex bookmarks or outlines may need to be checked after merging.