Merge PDF
Combine several PDF files into one document, in the order you choose, without uploading anything.
Your files never leave your device
or drop PDF files here
PDF · up to 200 MB per file · as many files as your device can handle
The merged PDF follows this order. Use the arrows (or drag on desktop) to reorder. Leave “Pages” empty to include every page.
Invoices from three suppliers, a contract and its signed annex, the scans of a passport and a visa: life is full of PDFs that belong together. This free Merge PDF tool joins them into one tidy document in the order you choose, and it does the whole job inside your browser, so not one page is uploaded.
Your files never leave your device. This Merge PDF tool runs 100% in your browser. There are no uploads, no accounts and no watermarks, and there is no tracking inside the tool.
How to merge PDF files
- Add your PDFs. Click Select PDF files or drag two or more PDFs onto the box. Each file shows its name, page count and size.
- Set the order. Use the up and down arrows, drag a file on desktop, or tap Sort A→Z. The merged document follows the list from top to bottom.
- Choose pages (optional). Type a page list such as 1-3, 5 under any file to include only those pages. Leave it empty to keep every page.
- Merge and download. Name the file, press Merge PDF and then Download merged PDF. The new file is built on your device in a second or two.
What this PDF merger can do
Why a private, in-browser merger is better
The PDFs people merge are rarely boring. They are bank statements for a visa application, payslips for a rental, medical reports, signed contracts and identity scans. Most popular online mergers upload those files to a remote server, process them there and ask you to trust that they are deleted afterwards. That may well be true, but you cannot check it, and the files still travel across the internet.
WorldScope Merge PDF takes a different approach. When you select files, your browser reads them from your disk into memory. The open-source pdf-lib library, running as ordinary JavaScript on this page, copies the pages you asked for into a brand new PDF, and your browser saves that file straight back to your device. There is no upload step, so there is nothing to delete later. Once the page and its library have loaded, you can even switch on airplane mode and the tool keeps working.
Merging tips that save time
- Name files with numbers. If your scans are called 01-cover.pdf, 02-letter.pdf and so on, one tap on Sort A→Z puts them in order. Numbers are sorted naturally, so 2 comes before 10.
- Drop the pages you do not need. A page list such as 1, 3-end skips an unwanted page 2 without a separate split step.
- Reorder pages inside a file. Pages appear in the order you type them, so 4, 1, 2, 3 moves the last page of a four-page file to the front.
- Keep it small for email. Merging never makes pages heavier, but scanned pages can be large. If the result is too big for an attachment, export the scans as compressed JPGs with our Compress JPG tool and rebuild them with JPG to PDF.
What gets copied, and what does not
Every page is copied with its text, fonts, vector graphics, images, rotation and size, so portrait and landscape pages can live side by side in the merged file. Links that point to websites usually keep working. Document-level extras are a different story: the bookmarks panel, attachments, interactive form fields and digital signatures belong to the original file rather than to its pages, so they are not carried over. If a document is signed, merging it creates a new file, and the signature will no longer validate. That is how signatures are designed to work, not a bug.
The title of the new file is set from the name you type, and the producer field says it was created with WorldScope Merge PDF. No other metadata, tracking code or watermark is added.
Limits and honest notes
Because everything happens on your device, very large jobs depend on your memory. A modern laptop handles hundreds of pages easily; an older phone may stop with an error above a few hundred megabytes in total. Password-protected PDFs cannot be merged until they are unlocked. If one file is damaged, the tool names it so you can remove it and merge the rest. Need the opposite job? Use Split PDF to pull pages out of a document.
Frequently asked questions
Is this PDF merger free?
Yes. There is no sign-up, no watermark, no page limit and no daily limit. The work is done by your own browser, so every extra file costs nothing to process.
Are my PDFs uploaded to a server?
No. The files are read and combined on your device with the open-source pdf-lib library. Only the library code is downloaded from a public CDN; your documents are never sent anywhere.
How many PDFs can I merge at once?
There is no fixed number. The practical limit is your device’s memory: dozens of normal documents are fine on a laptop, while a phone may struggle with several hundred megabytes in one go.
Can I merge only some pages of a file?
Yes. Type a page list under the file, for example 2-4, 7 or 5-end. Pages are added in the order you type them, so 3, 1, 2 also reorders pages.
Will links, forms and bookmarks survive?
Page content, text, images and most links are copied exactly. Bookmarks (the outline) and interactive form fields of the source files are not carried into the merged file, which is a common limitation of page-level merging.
Can I merge password-protected PDFs?
Not directly. Encrypted PDFs must be unlocked first in a reader that knows the password, for example by printing them to a new PDF. The tool tells you which file is protected.
Does merging reduce quality?
No. Pages are copied as they are, without re-compressing images or converting text, so the merged PDF looks exactly like the originals.
Does it work on iPhone and Android?
Yes. It works in current Safari, Chrome, Samsung Internet, Edge and Firefox. On a phone, use the file picker to choose PDFs from Files or Downloads.
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By Abdullah Al-Janoubi · WorldScope Tools · Updated October 2026
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