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Merge PDFs in the order you choose

Combine up to 10 PDFs into one document while preserving page size, orientation and searchable text.

This tool combines several validated PDFs into one file in the selected order.
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When this tool helps

This tool combines several validated PDFs into one file in the selected order. The situations below show what this workflow is designed for so you can choose the tool before uploading a document.

  • Add a cover to a report.
  • Combine several chapters into one document.
How it works

Merge PDF online

The “Merge PDF online” workflow consists of 3 consecutive stages. Review the settings and expected output at each stage because processing creates a new copy instead of overwriting the source.

  1. 01Upload PDFs

    Select two to ten PDF documents.

  2. 02Set the order

    Arrange the documents in the required order.

  3. 03Merge and download

    Create and download one combined PDF.

What you can do

The capabilities below describe what is included in the workflow and the resulting file. Use them to confirm whether this tool completes the task or whether another processing stage will be needed.

  • Up to 10 PDFs
  • Document reordering
  • Mixed page sizes
  • One PDF result

Limits and important details

Limits keep the result predictable by describing supported files, processing boundaries and PDF properties that may require manual review. Read them before starting, especially for complex documents.

  • Up to 500 pages in total
  • Interactive forms require review
  • PDFs are not stored in a permanent document library
  • An inactive guest session expires after 15 minutes
  • The hard session limit is 2 hours

Before you start

  • Keep the source file until the result has been reviewed
  • Check whether the PDF is password-protected or digitally signed
  • Identify the pages and objects that are expected to change
  • Use a non-sensitive test copy for an unfamiliar workflow

Result checklist

  • Open the downloaded copy in a second PDF viewer
  • Review every changed page at normal and enlarged zoom
  • Check text search, links, forms and visual quality where relevant
  • Confirm that confidential data and metadata meet the intended use
Example

Combine a cover and report

The “Combine a cover and report” scenario follows a source file through to a separate result. It shows which action is performed and what should be checked after download.

Input
Two synthetic PDFs: a cover and a report.
Action
Place the cover first and start the merge.
Result
One new PDF with pages in the selected order.
Privacy

Temporary processing in Germany, EU

The file is processed only inside a temporary guest session. Access closes when the session ends, and source and result files follow the service deletion lifecycle.

  • No permanent document library
  • No external AI, OCR or PDF providers
  • 15-minute inactivity timeout
  • 2-hour hard session limit
FAQ

Questions and answers

These answers apply specifically to “Merge PDF online” and extend the main instructions. They cover settings, expected output and the cases that most often need clarification before processing.

How many files can I merge?

The current limit is 10 PDFs and 500 pages in total.

What happens to PDF forms?

Interactive forms are rejected by default. You can explicitly flatten them after reviewing the warning.

Can I change the document order?

Yes. You can arrange the files before starting the merge.

Help center

Common errors and next steps

When processing cannot continue, the service shows a reason code and a safe next step. Resolve the stated issue and upload again or choose another mode; the source document remains unchanged.

FILE_TOO_LARGE

The source file is larger than the current upload limit.

Choose a PDF of up to 50 MB and upload it again.
PDF_PASSWORD_REQUIRED

The PDF is encrypted and cannot be processed without a known password.

Enter the document password in the password prompt, or choose another file.
Help center →
Help center

Useful guides

Practical guides provide context that does not fit into a short procedure: how to choose a mode, understand processing consequences and handle the document safely.

How to prepare a PDF for printingHow to share a PDF without leaking hidden dataPDF privacy and temporary processing

Editorial and technical review: · next review:

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