How to merge multiple PDFs into one?

With DuneTools you can merge PDFs in 3 simple steps: 1) Drag or select PDF files, 2) Arrange them by dragging thumbnails as needed, 3) Click 'Merge PDFs' and download. The process is free and runs locally in your browser.

Is it safe to upload my PDFs to DuneTools?

Absolutely safe. DuneTools processes all your files locally in your browser using WebAssembly technology. Your PDFs are never uploaded to any server, guaranteeing complete privacy. You can verify this by disconnecting from the internet after loading the page.

Can I rearrange pages before merging?

Yes, you can easily rearrange files by dragging the thumbnails. You can also rotate each PDF 90 degrees if needed. The final order of the combined document will be exactly as you arrange it.

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Merge PDF Online Free

Combine multiple PDF files into a single document in seconds. Drag to reorder, rotate pages, and download without watermarks.

🔒 100% Private

⚡ Instant

💯 No Watermark

📱 Mobile Friendly

📋 Quick Guide

How to Merge PDFs

3 simple steps to combine your documents

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Upload your PDFs

Drag or select up to 100 PDF files you want to combine.

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Order and Rotate

Drag thumbnails to reorder. Rotate pages if necessary.

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Merge and Download

Click "Merge PDFs" and download your combined document.

✨ Features

Everything You Need

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up to 100 PDFs

Merge up to 100 PDF files into a single document simultaneously.

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Easy Reorder

Drag and drop thumbnails to arrange your files exactly how you want.

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Rotate Pages

Rotate any PDF 90° to fix orientation before merging.

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Preview

View thumbnails of each PDF before combining them.

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Total Privacy

Your files are processed locally. They never leave your device.

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No Limits

Free, no registration, no watermarks, and no usage limits.

❓ FAQ

Frequently Asked Questions

With DuneTools you can merge PDFs in 3 simple steps: 1) Drag or select PDF files from your device, 2) Arrange them as you prefer by dragging thumbnails, 3) Click "Merge PDFs" and download the result. The entire process is free and performed locally in your browser.

Absolutely safe. DuneTools processes all your files locally in your browser using WebAssembly technology. Your PDFs are never uploaded to any server, ensuring complete privacy. You can verify this by disconnecting your internet after loading the page.

You can merge up to 100 PDF files simultaneously for free. There is no file size limit per individual file, although very large files may take longer to process depending on your device's power.

Yes, you can easily reorder files by dragging thumbnails. You can also rotate each PDF 90 degrees by clicking the rotation button. The final order of the combined document will be exactly as you arrange it.

Yes, DuneTools is fully optimized for mobile devices. It works on any modern browser (Chrome, Safari, Firefox) on both Android and iOS, without needing to download or install any app.