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Merge PDF Files

Combine multiple PDFs into one, in order you choose — processed entirely in your browser, never uploaded.

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Merging Without Uploading

Most "free PDF merge" sites upload your documents to their servers — a real concern when the files are contracts, IDs or medical records. This tool merges entirely inside your browser using the open-source pdf-lib library served from this site: pages are copied from each source into a fresh document and saved to your device. Watch the network tab — your PDFs never travel.

Reorder files with the arrows before merging; the output preserves each page's original size and orientation, so mixed A4/letter/landscape sources are fine. Encrypted (password-protected) PDFs must be unlocked first.

Frequently Asked Questions

Is there a file size or count limit?

Only your device's memory. Dozens of normal documents merge in seconds; very large scanned books (500+ MB combined) may be slow on phones.

Will form fields and links survive?

Page content, size and orientation are preserved. Interactive form fields and bookmarks may not carry over — flatten forms before merging if their content matters.

Why does my password-protected PDF fail?

Encrypted files cannot be read without the password. Open the PDF in a viewer, print/save it as a new PDF, then merge that copy.

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