Merge PDFs without uploading them.

Fold PDF reads the files you choose, previews their first pages, and combines them inside your browser. Your PDF contents and filenames are not sent to our server.

What stays on your device?

Your selected documents, their filenames, the previews and the finished PDF stay in this browser tab until you download the result. We do not use a file upload endpoint, account, or cloud document storage.

Your browser still downloads the website and its PDF tools. Our host, Cloudflare, receives ordinary website requests, which can include your IP address and browser information. Loading a website is separate from uploading a document.

Try a simple merge

1. Choose two standard PDF documents: for example, a two-page proposal and a one-page appendix.
2. Put the proposal first using the up/down arrows. The preview shows each file’s first page, not all its pages.
3. Select Merge PDFs. The result should have three pages: proposal pages 1 and 2, then the appendix.
4. Download the result and open it to check its order and contents.

What this tool preserves, and what it doesn’t

The merger copies pages rather than turning each page into a picture. Existing selectable text, page sizes and rotation are retained. Scans remain scans: we do not create searchable text or compress images.

• Password-protected or encrypted documents: not supported. With permission, export an unencrypted copy in your PDF app.
• Interactive forms and signature fields: rejected. Use a dedicated PDF editor. If you need only the visible form contents, create a flattened copy there and check it before merging.
• Digital signatures: merging does not preserve certificate validity. Detected signature fields are rejected; keep the original signed files.
• Bookmarks, embedded attachments and accessibility structure: not carried into the new document. The tool warns when it detects these features.
• Layers, annotations and complex PDFs: check the finished appearance and any links you rely on. This is a page merger, not a full document archive tool.
• Whole files: all pages in each file are included. There is no page selection, page rotation or page removal.

How much can I merge?

The tool accepts at most 20 files, 100 pages and 50 MB total per batch. Browser memory varies. On a phone, start with 5 files, 30 pages and 20 MB or less. If processing stops, reduce the batch or switch to a desktop browser.

Check the network behavior yourself

In a desktop browser, open Developer Tools → Network before adding a non-sensitive test PDF. Clear the request list, add your files, reorder them, merge and download. You should see only requests for local website resources when needed, and no requests containing your PDF or filename. Third-party browser extensions can affect what you see.

The application does not persist PDFs in local storage or IndexedDB. Clearing the workspace removes its file and preview references; creating a new result revokes the previous download link. Closing or reloading the tab clears the working session. Save the result first.

Technical sources

Local file access uses the browser File API. Page copying uses pdf-lib, with previews rendered by PDF.js. These libraries are served from this website.

Last reviewed: September 16, 2026