Merge PDF files without uploading them

Combining PDFs should not require uploading confidential documents to a stranger’s server. Drop your files below. Your browser does the merge. Nothing is uploaded.

The merge runs entirely in your browser. The files never leave your computer. No signup, no upload, no tracking.

Drop two or more PDF files. Drag to reorder if needed, then click Merge. The output is a single PDF containing all pages from all files in the order shown.

Why we do not upload your PDFs

PDFs are often the most sensitive documents on your computer: contracts, tax forms, medical records, bank statements. Most “free PDF merge” tools upload every file to a server, combine them there, and send back the result. You are trusting that server to delete your documents afterward, with no way to verify it.

This tool uses pdf-lib, a JavaScript library that reads and writes PDF documents directly in the browser. Your files never leave the tab. Open DevTools and watch the Network tab while merging to see for yourself.

Common questions

Is there a limit on how many PDFs I can merge? The free tier supports up to 5 files at a time. Each file can be up to 50 MB. Very large merges with hundreds of pages will use significant browser memory.

Does the merge preserve bookmarks and links? Page content, embedded images, and text are all preserved. Internal bookmarks and hyperlinks within each source PDF are preserved. Cross-document bookmark trees are not merged into a unified outline.

Can I reorder the files? Yes. Drag the file names in the list to change the order before clicking Merge.

Can I merge password-protected PDFs? Not currently. Password-protected PDFs must be unlocked first. The tool will show an error if a protected PDF is dropped.