Merge PDF files
Combine PDFs into one document and set the order with the arrows. No watermark, nothing uploaded, and the size limit is your device’s memory (phones hold less).
- Nothing is uploaded
- Works offline after first visit
- Open source
- No watermark · limit is your device’s memory; phones hold less
Combines two or more PDF files into one PDF, in the top-to-bottom order you set with the arrows, and saves it as merged.pdf. It is free, needs no account and adds no watermark, and your PDFs are not uploaded: the pages are copied together in your browser, so text stays selectable and images are not recompressed. The size limit is your device’s memory (phones hold less), and after one visit and a short wait the page works offline.
Done
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Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
A worked example: a cover letter, a CV and a certificate in one file
Say you are applying for a job and the form takes one PDF. Drop the three files; each shows its first page as a thumbnail. Press the up and down arrows until the cover letter is on top, then press Merge PDFs. You get merged.pdf with the pages of all three files one after another, and a note that says 3 files combined.
A merge needs at least two files. If a file is damaged or is not a PDF, the merge stops with a message that names it, and nothing is saved until you remove it.
How it works
- Drop two or more PDFs onto the page.
- Reorder them with the arrows until they are in the right sequence.
- Click Merge and download the single combined PDF.
In your browser, not on a server
pdf-lib, an open-source PDF library written in TypeScript, opens each document in your tab and copies its pages into a new PDF, preserving text, vector graphics, links and images as they are. The merged file is assembled in memory and handed to your browser’s download. Password-protected PDFs are unlocked first by qpdf, compiled to WebAssembly and loaded only when needed; the password is checked in your tab and the result is saved without encryption.
Compared with upload-based tools: Upload-based mergers cap the number of files, the total size, or the number of merges per day. This one is bound by your device’s memory (phones hold less), and your contracts, statements and scans are never copied to anyone’s server.
Verify it yourself. Give the page a short while after one visit to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Can I add text, a highlight or an image to the PDF too?
Yes. Edit PDF adds text, cover boxes, highlights, drawings and images to a page and rotates, deletes or reorders pages, all in your browser. It cannot change the text already in the file.
Is there a limit on the number or size of files?
No. Other free tools cap you at two or three tasks an hour or a set file size because they pay for servers. This tool does the work on your device, so the limit is your device’s memory (phones hold less). Merging fifty PDFs or a few hundred megabytes is fine on a normal laptop.
Can I merge PDFs without uploading them?
Yes. The merge is done by pdf-lib, a JavaScript library that runs inside your browser tab, so your PDFs are read from your disk and the merged file is written back to it. Open your browser’s network tab while you merge and no request carries a PDF.
Will bookmarks, links and form fields survive?
Page content, images, fonts and internal links within a page are preserved. Bookmarks (outlines) and form fields are not carried across when copying pages between documents. A PDF that only restricts printing or copying is unlocked in your tab and merges normally. One that needs a password to open asks for it once. The unlocking program is downloaded from this site the first time such a file is dropped, so offline you can only merge protected PDFs once that program has been downloaded.
Can I merge only some pages of a file?
Use the Split PDF tool first to extract the pages you need, then merge the results.
How do I change the order of the PDFs before merging?
After you drop the files, use the up and down arrows beside each one. Files are combined from top to bottom. To change the order of pages inside a single file afterwards, use Reorder PDF.
Do I need an account, and is there a watermark?
No account and no sign-up: open the page and drop a file. Nothing is added to your file, so there is no watermark or logo. It is free, and your files are not uploaded.
More PDF tools
Split PDF
Pull out the pages you need, or break a document into single pages. Done on your device.
Compress PDF
Shrink a PDF for email or an upload limit. Pick a level, or type the size you need, like 1 MB, and the page tries the gentlest setting that fits. Processed on your device.
Rotate PDF
Fix sideways scans for good. Rotate every page or just the ones you pick, then save.
Unlock PDF
Remove the open password and the print, copy and edit restrictions from a PDF whose password you know.
Popular conversions
Guides
- Is it safe to merge PDFs online?It depends on one thing: whether the file leaves your computer. Here is how to tell, and how to merge without it leaving.
- Is iLovePDF safe?iLovePDF is an established European service with good published practices. For confidential PDFs, the safer question is whether they need to be uploaded at all.
- Is PDF24 safe?PDF24 is a long-standing German project, and it tells you itself that its offline app is the more private option. Here is how to choose between the two, and a third way.
- How to merge PDFs on an iPhoneThe Files app can do this, though the steps are not obvious. Here they are, plus a faster option when you need to reorder pages.
- A free Smallpdf alternative with no daily limitSmallpdf's free plan has daily limits. Here is what that means, and a way around it where your files are never uploaded.