Merge PDF Files Online — Free, Private, No Upload
Drop in as many PDFs as you like, drag them into the order you want, and download a single combined file. The merge runs inside your browser using a PDF engine written from scratch — your documents are never uploaded, so contracts, invoices, and medical records never leave your machine.
How it works
- 1 Add your PDFs Drop the files onto the box or click to pick them. Each one is read locally and its page count appears next to the filename.
- 2 Put them in order Use the up and down arrows to arrange the files. Pages are combined top to bottom, in exactly the order shown.
- 3 Merge and download Click Merge PDFs and save the result. The combined file keeps every page at its original size, rotation, and quality — nothing is re-compressed.
Your data stays private
All processing happens entirely in your browser. No files, text, or data are ever sent to our servers. You can disconnect from the internet and this tool will still work.
Frequently asked questions
- Are my PDFs uploaded to a server?
- No. The whole merge — parsing, combining, and writing the new file — happens in JavaScript inside your browser. Nothing is transmitted, which is why the tool still works if you disconnect from the internet after the page loads.
- Is there a file size or page limit?
- There is no artificial limit. The practical ceiling is your device's memory, since every file is held in RAM while merging. Hundreds of pages and files well past 100 MB are fine on a normal laptop.
- Will the merged PDF lose quality?
- No. Page content streams and embedded images are copied byte-for-byte with their original compression. Nothing is re-encoded, so a scanned page comes out exactly as sharp as it went in.
- Can I merge a password-protected PDF?
- Not directly. Encrypted files are rejected with a clear message. Open the PDF in a reader, save an unprotected copy, then merge that.
- What happens to bookmarks and form fields?
- Page content, annotations, and links are carried over. Document-level features — the bookmark outline, AcroForm field definitions, and named destinations — are not merged, because they belong to the document that was replaced.
- Is there a watermark or a signup wall?
- Neither. No account, no email, no watermark, no daily quota. The tool is free and stays free.