Combine multiple PDFs into one file

PDF Merge joins two or more PDF files into a single document, in the order you choose. It is the tool to use when a contract, a scan, and a cover sheet live in separate files and the person you are sending them to asked for one attachment. Each page is copied into a new PDF. The original files on your disk are not overwritten. The download is always named merged.pdf, so you can tell the result apart from the sources.

The work is done in your browser with the open-source library pdf-lib. QuickConvert creates an empty PDF, copies the pages from each file you added, and sets the document title to “Merged PDF” and the producer and creator fields to QuickConvert. There is no upload step and no account. If you only have one file, the Merge button stays disabled until you add a second PDF.

Page content — text, images, and the visual layout of each page — is what gets copied. Document-level extras are a different story. Bookmarks that point across the original files, some interactive form fields, and JavaScript attached to a PDF often do not survive a client-side merge. If a form must stay fillable, merge a copy and check the result before you send it. For a packet of scans or exported reports, the pages themselves are what matter, and those come through.

1. Open PDF Merge and drop two or more PDFs onto the box, or click the box and pick them from your files. You can add more after the first batch.
2. Check the list. Each row shows the file name and size. Use the up and down arrows to set the order. The top file becomes the first pages of the merged PDF.
3. Remove anything you added by mistake with the trash icon on that row. A file that is the same name, size, and modified time as one already in the list is not added twice.
4. Click Merge and download. A progress line reports how many files have been copied. Your browser then saves merged.pdf.

You need at least two PDFs. One file is not a merge, and the page tells you to add another. Very large files are rejected before processing: each PDF must be 80 MB or smaller, because the whole file is read into browser memory.

Put the files in reading order before you merge. A cover page, then the body, then the appendix is easier to fix with the arrows now than by splitting the result later. If you are combining a scan with a born-digital PDF, look at the merged file once: page size can change from page to page, and that is normal when the sources were different paper sizes. The tool does not scale pages to a single size.

Name the originals clearly before you start. The result is always merged.pdf, so a descriptive source name is what you will still see in the list while you reorder. If you need a subset of a long PDF rather than the whole file, extract those pages with PDF Split first, then merge the extract with the other documents.

Keep a copy of the originals until you have opened the download. Merging does not delete your inputs, but a download can be blocked by a browser setting, and it is easier to run the tool again than to reconstruct the set.

“Add at least two PDF files to merge” means the list has fewer than two files. Add another PDF. If the button looks disabled, that is the same check.

A password-protected PDF stops the merge. The reader is opened with encryption left on, so a locked file produces an error asking you to remove the password in a PDF reader first. QuickConvert does not ask for the password and does not try to crack it.

“That file type is not supported” appears when a drop is not a PDF. Rename a .pdf that is actually a Word file will not help: the tool checks the type and the extension, then tries to parse the file. A damaged PDF fails with a message that it could not be read.

If the tab becomes slow or the browser reports it is out of memory, the combined size is too large for that device. Merge fewer files, or split a huge scan first. Phones have less memory than a desktop, so a packet that works on a laptop can fail on a phone even though nothing is uploaded.

An empty-looking result usually means the sources had no pages. The tool refuses to save a PDF with zero pages.

Nothing in this tool is sent to a QuickConvert server. The page loads from the host like any other page. After that, the PDFs you drop are read with the browser’s file APIs, copied in memory by pdf-lib, and handed back to you as a download created with a temporary object URL. That URL is revoked about a second after the download starts. Closing the tab drops the in-memory copies. QuickConvert does not keep a library of your documents, and there is no account that could store them.

This is separate from the site shell around the tool. The public site may load Google Analytics 4 and Google AdSense, which can set cookies and receive the fact that you opened the page. Those scripts do not receive the bytes of your PDF. The details are in the Privacy Policy and in the guide on privacy with online file tools.

You drop two or more PDFs, arrange them with the arrow buttons, and click Merge and download. The page reads each file in your browser, copies its pages into a new document in the order of the list, and saves the result as merged.pdf. Pages are copied, not redrawn, so text stays selectable and scans keep their original quality. The source files on your device are not modified, and none of them are sent to a server.

One attachment instead of six

A landlord, recruiter, or visa office asks for “all documents in one PDF”. Put a cover page first, then the items in the order of their checklist, and merge. A reviewer reading top to bottom against a list finds everything where they expect it. Our guide to merging PDFs without uploading them covers what gets copied and what to check.

Rebuilding a document that was scanned in pieces

A 40-page contract scanned in two batches arrives as part1.pdf and part2.pdf. Merge them in order and you have the full document again. If a page in the middle was rescanned, extract the good pages with PDF Split and merge the pieces with the replacement page in the right place.

Monthly statements into a yearly file

Twelve downloaded statements can become one file for an accountant. Name the sources 2026-01.pdf to 2026-12.pdf before you drop them, so the list is easy to check before you merge.

Adding a signed page back

You printed one page, signed it, and scanned it. Split the original to remove the unsigned page, then merge the parts and the scan in order.

• Name sources with number prefixes (01-cover.pdf, 02-id.pdf). The list shows file names, and numbered names make the intended order obvious.
• Rename the output immediately. Every merge produces merged.pdf. Something like Lastname_application_2026.pdf will not get lost in someone else’s inbox.
• Photos need to be PDFs first. The tool accepts PDF only. Use a scanner app or your device’s “Print to PDF” to turn a JPG into a PDF, then merge.
• Fill and flatten forms before merging. Interactive form fields do not always survive. Save or print a filled form to a new PDF so the values are part of the page.
• Check the size last. If the merged file is too big for email or a portal, run it through PDF Compress. Scanned pages are usually where the size is.
• Use a computer for large packets. All work happens in browser memory, and phones have less of it.

• At least two PDFs; each up to 80 MB.
• Password-protected files are refused. Unlock a copy in a reader that has the password.
• Pages keep their own size and orientation. Mixed A4 and Letter pages, or a sideways page, stay that way. Rotate pages in a reader before merging if needed.
• Bookmarks, document-level JavaScript, and some form fields from the sources are not carried over.