convertallfiles.app
PDF tool

Merge PDF Files

A PDF is really a tree of objects — pages, fonts, images — stitched together by an index, so merging two documents means grafting the page objects of one file onto another's tree. That's exactly what this tool does with the pdf-lib library running in your browser: it copies every page, in the order you added the files, into a fresh document. Because nothing is uploaded, there are no page limits, no watermarks, and no queuing behind other people's files.

Drop your files here or click to browse

.pdf — up to 200 MB each. Processed locally; never uploaded.

How to merge PDF Files

  1. Drop two or more PDF files onto the box above — you can add them in several batches.
  2. Each file is checked for a real %PDF header, and listed in the order it will appear.
  3. Re-order by removing and re-adding files, or remove any file with its × button.
  4. Click Merge. The pages are copied into a new combined document on your device.
  5. Download merged.pdf — page order matches your file order exactly.

Frequently asked questions

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

No arbitrary cap — the only limit is your browser's memory, since the whole merged document is assembled locally. Merging a handful of normal documents is effortless; hundreds of scanned pages may strain an old laptop.

Will bookmarks, links, and form fields survive?

Page content is copied faithfully, but document-level structures like outlines (bookmarks) and interactive form fields are not carried over in this version. Internal links that jump between pages may need re-creating.

Can I merge password-protected PDFs?

Not currently — the loader skips encrypted files rather than asking for passwords. Remove the password in your PDF viewer first, then merge.

Why is there no upload progress bar?

Because there is no upload. Your files are read straight from disk into browser memory, merged by JavaScript, and saved back to disk. The network is never involved.