Merge PDF files
Combine PDFs into a single document. Drag to reorder. No file limits, no watermark, nothing uploaded.
Done
Open the network tab. It stays empty.
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.
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.
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 only by your device’s memory, and your contracts, statements and scans are never copied to anyone’s server.
Verify it yourself. Load this page, turn off Wi-Fi or switch to airplane mode, and run the tool. 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
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 has no server, so the only limit is your device memory. Merging fifty PDFs or a few hundred megabytes is fine on a normal laptop.
Are my PDFs uploaded?
No. The merge is performed by pdf-lib, a JavaScript library that runs inside your browser. You can confirm this in your browser network panel: no request carries your file.
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. Password-protected PDFs need to be unlocked first.
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.
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 PDFs for email or upload limits. Three levels, from lossless cleanup to aggressive. Processed on your device.
Rotate PDF
Fix sideways scans for good. Rotate every page or just the ones you pick, then save.
Image to PDF
Turn photos, scans and screenshots into a single PDF. One image per page, in the order you choose.
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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.
- Does this website upload my files? How to checkA five-minute check with tools already in your browser. No trust required.
- How to sign a PDF without Adobe AcrobatSign a contract in your browser in a minute, with nothing uploaded, and the built-in options on every platform.
- How to convert and edit files without uploading themBrowsers can do most file jobs themselves. What runs locally, why it is enough, and which tools to use.