Is there a limit to how many PDFs I can merge?

No hard limit is enforced by this tool. Very large combined files are only bounded by your device's available memory, since merging happens entirely in your browser.

Will the page order and formatting be preserved?

Yes. Each source PDF's pages are copied into the new document exactly as they appear, including embedded fonts, images, and page size — nothing is re-rendered or flattened.

Can I reorder pages after merging, not just reorder the files?

This tool merges whole files in the order you set before merging. If you need to reorder or delete individual pages afterward, run the merged file through the Rearrange Pages tool.

Do the PDFs need to be the same page size?

No. Each page keeps its own original dimensions in the merged file — mixing a portrait A4 document with a landscape spreadsheet export works fine.

What happens to bookmarks and links in the original files?

Internal bookmarks from each source file are preserved within that file's section of the merged document. Links that point to a specific page within the same source file continue to work.

Can I merge password-protected PDFs?

You'll need to remove the password first using the Unlock PDF tool, since this tool needs to read each file's actual page content to merge it.

Does merging reduce file quality?

No. Pages are copied at their original resolution and quality — merging doesn't re-encode images or text. If you also want a smaller file, run the result through Compress PDF afterward.

Is my file uploaded to a server?

No. Every operation on this page runs locally in your browser using JavaScript and WebAssembly. Your file is never transmitted anywhere, which also means it works without an internet connection once the page has loaded.

Merge PDF

Combine multiple PDF files into a single document, in any order you choose.

Processed entirely in your browser — your file is never uploaded anywhere.

Why merge PDFs with Tools Root

Combining reports, scanned forms, invoices, or chapters into a single PDF is one of the most common document tasks there is, and it shouldn't require installing desktop software or handing your files to a server you don't control. This tool copies each source PDF's real page content — fonts, images, and page geometry — directly into a new document, so the result looks exactly like the originals, just stitched together.

How it works under the hood

Merging uses a PDF engine that reads and writes the actual PDF object structure rather than rasterizing pages into images and rebuilding a new file from pictures. That's why text stays selectable and searchable in the merged output, and why file size doesn't balloon the way it would if pages were flattened to images first.

Common use cases

Combining multiple scanned pages of a signed contract into one file, assembling a multi-chapter report from separate department submissions, merging a cover letter with a resume before emailing an application, or joining several monthly statements into a single annual record for tax purposes.

How to merge PDF files

1Drag and drop two or more PDF files into the upload area, or click to browse.
2Reorder the files by dragging them into the sequence you want in the final document.
3Click "Merge PDFs now" — the combined file is ready in seconds.
4Download your merged PDF.

Frequently asked questions

Related tools

Split PDF

Extract pages from a PDF into separate files, by range, by count, or by bookmark.

Compress PDF

Shrink PDF file size by compressing embedded images and optimizing fonts.

Rotate PDF

Rotate every page or a chosen subset by 90, 180, or 270 degrees.

Delete Pages

Remove specific pages from a PDF using a visual thumbnail picker.