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Yunknow Toolbox

Merge PDF

Combine multiple PDF files into one, right in your browser — free, fast and private.

What is merging a PDF?

Join several PDF files into one — ideal for combining separate chapters, invoices, scanned pages or reports into a single document that is easy to send and archive. Everything runs locally in your browser with no upload.

How to use it

  1. Select or drop in multiple PDFs.
  2. Check the order (pages follow your selection order).
  3. Click Download for the merged PDF.

Handy tips

  • Pages are kept as-is — they are not turned into images.
  • If the merged file is large, run it through Compress PDF.
  • Only need some pages? Use Split PDF.

Frequently Asked Questions

Are my PDFs uploaded?

No. Merging runs entirely in your browser. Your files are never sent to a server or stored.

How many can I merge?

There is no hard limit — it depends on your device memory. For many or large files, a desktop browser works best.

Does merging change quality?

No. Merging copies each PDF’s pages into the new file as-is, with no re-compression, so text and selectable content are preserved.

Related reading

How to Merge PDF Files Without Uploading Them →

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Embed this tool

Add this tool to your own website or blog for free — just copy and paste the code below (it includes a link back to this site).