Are my PDFs uploaded?

No. Pages are copied with a client-side PDF library in this tab. Close the tab to drop the bytes.

Why did merge fail on a locked file?

Password-protected PDFs cannot be copied until they are decrypted. Use Unlock PDF with the password you already know, then merge the unlocked copies.

Files merge in list order (top to bottom). Use the arrows to reorder whole files, not individual pages.

Up to 10 files, 25 MB each. Very large page counts can exhaust tab memory; split the job if the tab freezes.

Utill.net

Merge PDF

Combine PDFs in Your Browser

Join multiple PDF files into one, reorder pages, and download. Processing stays on your device—nothing uploaded.

This conversion runs only in your browser — nothing is uploaded.

Drag & drop PDFs, or browse below

Browse files

Files—
Original—
Result—

What is this tool?

A browser PDF merger. You add PDFs, reorder the file list, and download a single document whose pages are concatenated in that order. Processing stays on the device.

It does not edit text, add watermarks, or split pages. It does not crack encryption.

Common use cases

Combine signed scans and a cover letter into one attachment
Join chapter exports from a printer driver
Stack receipts before an expense upload that allows only one PDF

How to use

Drop two or more PDFs (or use Sample for two tiny demo files).
Reorder with the up/down buttons; remove files you do not want.
Download PDF. The browser builds the merged file locally.

Examples

Input	Notes
`a.pdf` then `b.pdf`	All pages of A, then all pages of B.
Reorder B above A	Output starts with B’s pages.
Encrypted `secret.pdf`	Merge fails until you unlock it with the known password.
11th file	Rejected — max 10 PDFs per run.

Practical pitfalls

Forms and some annotations may flatten or drop depending on how they were saved; check the output.
Bookmarks and some metadata from source files are not a guaranteed merge of every dictionary.
Unique gotcha: merge copies pages, not “print as booklet” imposition. Duplex layout stays whatever each file already was.

References

Last reviewed: 2026-10-11

Frequently asked questions

Are my PDFs uploaded?: No. Pages are copied with a client-side PDF library in this tab. Close the tab to drop the bytes.
Why did merge fail on a locked file?: Password-protected PDFs cannot be copied until they are decrypted. Use Unlock PDF with the password you already know, then merge the unlocked copies.
Page order?: Files merge in list order (top to bottom). Use the arrows to reorder whole files, not individual pages.
Limits?: Up to 10 files, 25 MB each. Very large page counts can exhaust tab memory; split the job if the tab freezes.