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Alternate merge Online

Interleave odd and even scan documents.

Interleave pages from two PDFs, useful for combining odd-page and even-page scan passes into one correctly ordered document.

Kaazo's Alternate merge works in your browser for supported files, so the document itself does not need to be uploaded to a Kaazo conversion server. It is designed for quick everyday pdf organisation while keeping the workflow simple.

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Choose PDF files

or drag and drop from your device

Processed locally in your browser
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Your privacy is protected

Processing happens inside your browser. Kaazo cannot access, store or transmit your files.

About Alternate merge online

Alternate merge is a free browser-based PDF organisation tool designed to interleave odd and even scan documents. If you are looking for a practical Alternate merge online, this page focuses on that specific task with the controls, instructions and related utilities kept together in one place.

A common reason to use this tool is to combine odd and even duplex scan batches. It can also help when you need to merge front-side and back-side scans. For the supported workflow, the selected file is read and processed on your device rather than being uploaded to a Kaazo conversion server. This can be especially useful for quick work on personal documents, business files, web content or development data where you want a straightforward result without creating an account.

InputPDF files
ProcessingLocal in-browser processing for the supported task
AccountNo sign-up required
CostFree browser utility

How to use Alternate merge

  1. Choose one or more files from your device using the upload area above.
  2. Review any options shown for this tool and set them for the result you need.
  3. Select Interleave PDFs and keep the tab open while your browser processes the file.
  4. Download the result and review it before replacing or deleting your original file.

When to use Alternate merge

Alternate merge PDF is useful when you need to interleave two PDF files without moving the working file through a third-party upload queue. Common examples include:

Common use cases

  • Combine odd and even duplex scan batches.
  • Merge front-side and back-side scans.
  • Reconstruct two-pass scanner output.

Tips for better results

  • Confirm which file contains the first page before interleaving.
  • Check whether the second scan batch is reversed.
  • Review several page pairs after merging to catch scan-order issues.

Privacy, compatibility and output quality

The supported processing for this tool runs locally in the browser. That means your selected PDF files stay on the device during the operation instead of being sent to Kaazo for server-side conversion. Browser-based processing can still be limited by your device's memory, browser capabilities and the complexity of the source file, especially with very large documents.

For important business, legal, financial or archival documents, keep the original and inspect the downloaded result carefully. Complex fonts, forms, layers, spreadsheet features, OCR text or unusual file structures may not reproduce exactly the same way as specialist desktop software.

Alternate merge FAQ

What does Alternate merge do?

Alternate merge is designed for one focused task: Interleave odd and even scan documents. The controls above let you complete that workflow directly in your browser.

Is Alternate merge free to use?

Yes. You can use Alternate merge on Kaazo Tools without creating an account.

Does Alternate merge upload my files to Kaazo?

For supported PDF operations, processing happens locally in your browser rather than through a Kaazo conversion server.

Can I use Alternate merge on a phone?

Yes. The interface is responsive, although larger files and more complex tasks are usually easier on a device with more memory and a larger screen.

Should I review the Alternate merge result?

Yes. Keep your original input when it matters and check the result before publishing, sharing or replacing the source.

Related tools

Continue your workflow with these related Kaazo utilities.

Merge PDFCombine multiple PDFs in your chosen order.Reverse PDF pagesReverse the complete page order instantly.Organise PDFReorder, rotate or remove pages visually.Split PDFSeparate pages into individual or grouped files.Rotate PDFRotate selected pages by 90, 180 or 270°.

Browse more PDF Tools for related workflows.