Merge PDF
Select two or more PDF files and merge them into a single document, in exactly the order you picked them. Everything happens in your browser — your files are never uploaded to a server, which makes this safe even for contracts and ID documents.
Your file is processed entirely in your browser — it is never uploaded.
How merging works
Each file's pages are copied into one new PDF in selection order. Page sizes, bookmarks-free structure and embedded text are preserved because pages are copied natively, not re-rendered. To control the order finely, rename files before selecting (01-, 02-, 03-) or merge in two passes. After merging, use our Organize PDF tool to drag pages into final order.
Frequently Asked Questions
Is there a file limit?
The practical limit is your device's memory. Dozens of normal PDFs merge fine; a single file of several hundred MB may strain a phone.
Are my files uploaded?
No. Merging runs 100% in your browser with the pdf-lib library — nothing leaves your device.
Can I merge a password-protected PDF?
Files with an open password cannot be read. Remove the password first if you know it — see the Unlock PDF tool for what is possible.
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