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Free local PDF merger

Merge PDFs in the order you choose

Add two or more PDF files, drag them into place, and create one combined PDF. The merge runs in your browser, so your original documents are not uploaded to an Aftermath server.

Choose your local files.

Choose files to load the local PDF workspace. Nothing is uploaded or stored by Aftermath.

The local PDF workspace loads after you choose a file.

Merge PDFs locally

Add at least two PDFs and drag them into the output order. JavaScript activates the local merger on this page.

Drag to put every PDF in the right place

A merged PDF follows the queue from top to bottom. Drag a file row to a new position, or use its move buttons if you prefer a keyboard-friendly workflow. Each source file stays intact; Aftermath copies its pages into a newly created combined PDF.

Useful for packets, attachments, and scans

Use merge when several flat PDFs need to become one ordered document, such as a cover page plus supporting pages or separate scan batches. Check page order before exporting because the tool preserves the order you set, not the order files happened to arrive from your device.

Questions people ask

Will merging change my original PDFs?

No. The merger reads local copies of the files and creates a separate download. Your selected source files are not altered.

Can I reorder PDFs before I merge them?

Yes. Drag rows into the intended order, or use the move up and move down controls. The final PDF uses that exact sequence.

How many PDFs can I merge at once?

The current browser workspace accepts up to 25 PDFs, up to 100 MB per file and 300 MB total. It allows up to 2,000 pages in the combined output, subject to the available memory in your browser.

Can I merge a signed, filled, or encrypted PDF?

No. The workspace rejects encrypted PDFs and PDFs containing interactive form or signature data instead of creating a potentially broken output. Use an authorized flattened copy or a dedicated PDF application, and keep the original.

How to use this tool

Merge two or more readable flat PDFs in the order you choose, producing a separate PDF that copies their source pages from top to bottom. The originals remain unchanged in this browser session. This workflow does not preserve unsupported encrypted, interactive-form, signed, or malformed content, so review the merged copy before sharing it.

What to choose and what you get

What to choose

  • two or more flat, unencrypted, unsigned PDF files in the chosen order

Result

  • one separate merged PDF containing the source pages in queue order

Supported use

  • Combining complete flat PDFs into one ordered document
  • Reordering source files before the merge

Before you start

  • Image inputs belong to /jpg-to-pdf, while selected-page extraction belongs to /split-pdf.
  • Encrypted, interactive-form, signed, and malformed PDFs are rejected before rewrite.

Supported formats

  • Accepted formats: PDF.
  • Output formats: PDF.

Browser support and permissions

  • Modern browser with JavaScript; flat PDF features, page limits, and available browser memory apply.
  • No camera, microphone, or screen permission is needed.

Choose the right settings

  • Use this route when several PDFs should become one ordered document.
  • Use /split-pdf when one PDF should become selected page groups.
  • Use /jpg-to-pdf when the sources are raster images rather than PDFs.

Worked example

Three flat PDFs need one combined document in a deliberately changed order: cover, appendix, then report.

Starting facts

  • All sources are flat, readable, unsigned and unencrypted.
  • Queue order must control the output page order.

Observed operation: Arrange the files, copy their pages into a separate PDF in queue order and reopen the completed result locally.

Review the result: Verify total page count, boundaries between sources and final order in the reopened download before sharing.

Boundary: The route rejects complex PDFs and cannot preserve signatures, forms, encryption, attachments or every interactive feature.

What you can do

Combine two or more flat PDFs in a chosen order

Choose another tool when

  • This route does not split a PDF, convert images into PDF pages, edit existing content, or normalize page sizes.
  • Encrypted, interactive-form, signed, or malformed PDFs are not rewritten.

If it does not work

  • Fewer than two readable PDFs are available to merge.
  • A source is encrypted, malformed, signed, or contains interactive form data.
  • The selected files exceed the bundled workspace or browser-memory limits.

Things to know

  • The merger copies complete source pages in file order; it does not edit page content.
  • Existing page sizes and orientations are not normalized by this route.
  • The result must be reviewed before replacing or submitting any source document.

Privacy boundary

Selected PDF bytes stay in the current browser session and are not sent to an Aftermath processing service. How local processing is verified.

What this tool verifies

Checks the displayed limits and reports or creates one separate merged PDF containing the source pages in queue order from two or more flat, unencrypted, unsigned PDF files in the chosen order.

Check before sharing

This route does not split a PDF, convert images into PDF pages, edit existing content, or normalize page sizes.

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