Merge PDF

What is a PDF merger?

A PDF merger takes several separate PDF documents and joins them, page after page, into a single file. It is one of the most common document tasks there is: stapling a cover letter to a CV, combining scanned pages into one record, assembling chapters into a report, or gathering receipts into a single expense submission.

This tool does it entirely in your browser. When you add files, each one is read directly on your device, its pages are copied into a new document in the order you set, and the combined PDF is handed back to you as a download. No upload, no account, no watermark — and because the files never travel anywhere, even confidential documents stay private.

How to use it

1. Add your PDFs. Click Choose PDF files and select two or more documents. You can come back and add more; new files are appended to the list.
2. Set the order. The merged document follows the list from top to bottom. Use the up and down controls to rearrange, and the remove button to drop anything you added by mistake.
3. Merge and download. Click Merge & download. The tool assembles the pages and saves the result as merged.pdf. A spinner shows while it works; large files take a moment.

That is the whole flow. There is nothing to install and nothing to sign up for.

What gets preserved — and what doesn't

A merge copies the pages of each source document, so the text, images, vector graphics and page sizes come across intact. Pages keep their original dimensions, which means an A4 document and a US-Letter document can sit side by side in the same file; the merged PDF simply contains pages of both sizes.

A few things are worth knowing:

• Bookmarks, form fields and some annotations may not survive a basic page copy. If your documents rely heavily on interactive forms, check the result before relying on it.
• Mixed orientations are fine — portrait and landscape pages coexist happily.
• File size of the merged document is roughly the sum of the inputs. Merging does not re-compress anything, so the combined file is about as large as its parts added together.

Tips and best practices

• Name files so they sort the way you want. If you select many documents at once, adding a numeric prefix like 01-cover, 02-body, 03-appendix makes the intended order obvious and easy to confirm in the list.
• Do a quick order check before merging. Reordering after the fact means merging again, so glance down the list first and make sure the sequence reads correctly top to bottom — and if you merge a page you didn't mean to include, split PDF lets you pull it back out.
• Combine related scans into one record. Scanners often output one PDF per page. Merging them into a single document makes the result far easier to file, email and search than a folder full of fragments.
• Keep your originals. The merge produces a new file and leaves your source PDFs untouched. Hold on to them until you have opened the merged result and confirmed it is complete.

Common mistakes to watch out for

• Trying to merge an encrypted PDF. If a document is password-protected, its contents can't be read, and the merge will fail. Re-save the file without a password first, then add it.
• Expecting forms to stay fillable. Interactive form fields can be lost or flattened when pages are copied between documents. If keeping a form interactive matters, merge a flattened copy or verify the fields still work afterwards.
• Adding the same file twice. It is easy to select a document, then select it again in a second batch. Scan the list for duplicates before merging, and use the remove button to clear extras.
• Merging enormous scans all at once. Because every page is held in memory, a stack of very large image-based PDFs can strain your browser. If things slow down, merge in smaller groups and then merge those results together.

Why merge in the browser?

Most online PDF tools send your documents to a server to do the work. That is fine for a holiday itinerary, but it is the wrong choice for contracts, medical records, payslips or anything else you would rather not hand to a third party. By doing the merge locally, this tool keeps every page on your own machine from start to finish.

That privacy comes with practical perks too: there is no upload wait, no file-size cap imposed by a server, and nothing to delete afterwards. You can merge document after document back to back, and the moment you close the tab, none of it remains anywhere.

A quick mental model

Think of the file list as the spine of a new binder and each PDF as a stack of pages you are slotting in. The order in the list is the order in the binder; remove a stack you didn't mean to include, slide stacks up or down until the sequence is right, then bind it all together with one click. What you get back is a single, ordinary PDF that opens in any reader — ready to send, print or archive, and if the combined file needs consistent pagination, add page numbers finishes the job in one more step.