Is my PDF uploaded to a server?

No. Everything runs in your browser using pdf-lib. Your files are never uploaded to any server or transmitted anywhere.

Does the order of files matter?

Yes. Files are merged in the order shown in the list. Use the up/down arrows to reorder them before merging.

Is there a file size or page count limit?

There is no hard limit imposed by the tool — it is only constrained by the memory available in your browser. Very large PDFs (hundreds of pages or high-resolution images) may be slow to process.

Will bookmarks and annotations be preserved?

Pages are copied with their content intact, but embedded bookmarks, interactive form fields, and some annotations may not be preserved in the merged output.

Free Tool

PDF Merger

Combine multiple PDF files into one. Upload, reorder by dragging, then download the merged PDF — all in your browser.

Drop PDF files here or click to browse

Select two or more PDF files to merge

How merging works

This tool appends the pages of all uploaded PDFs in the order shown. You can reorder files before merging.

How to use

Upload two or more PDF files.
Reorder them using the up/down arrows.
Click Merge PDFs.
Download the combined file.

All merging runs in your browser using pdf-lib — no files are uploaded to any server.

Frequently Asked Questions

Is there a limit on how many PDFs I can merge?: No hard limit. Very large files may take longer to process since everything runs in your browser.

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