Merge PDF
Combine multiple PDFs into one document right in your browser — reorder files freely, no uploads, no watermarks, no signup.
Drop files here or click to choose
This tool runs entirely in your browser. Your data never leaves your device — it is not uploaded to any server.
How to use
- 1Drop two or more PDF files into the box (or click to choose them).
- 2Rearrange the list with the ↑ / ↓ buttons until the order is right.
- 3Click Merge PDFs and download the combined file.
Merge PDF
Drop in as many PDFs as you need, arrange them in the exact order you want, and merge them into a single file. Bookings, invoices, scanned chapters, application bundles — anything that arrives as ten separate attachments becomes one tidy document.
Unlike online mergers that upload your files to a server, this tool reads and writes PDFs entirely on your device with pdf-lib. Your contracts, IDs and financial documents never leave your browser.
Frequently asked questions
How many PDFs can I merge, and how large can they be?
There is no artificial limit — the practical ceiling is your device's memory. A modern laptop comfortably merges 20+ files or around 100–200 MB total; very large scans may be slower but still work.
Will bookmarks, form fields or annotations survive the merge?
Page content, images and most annotations are preserved. Document-level extras such as bookmarks and form field values are not carried over — the merged file contains the visual pages of each source.
Are my files uploaded anywhere?
No. Merging happens locally in your browser with JavaScript. Nothing is sent to any server, and the merged PDF is generated on your own device.
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Embed this tool
Put this tool on your own site with one line — it runs entirely in the visitor's browser.
<iframe src="https://zoyku.com/en/tools/merge-pdf?embed=1" width="100%" height="640" style="border:0;border-radius:16px" title="Zoyku — merge-pdf" loading="lazy"></iframe>