Combine PDF files into one
Join contracts, scans and statements into a single PDF without sending any of them anywhere.
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.
The files people combine are the ones they least want on a stranger's server: signed contracts, bank statements, medical letters, ID scans for a visa application. This page joins them with pdf-lib inside your browser, copying every page into a new document with its fonts, images and links intact. The combined PDF is written on your device and downloaded from there.
Add the files in any order and use the arrows to arrange them; the result follows the list top to bottom. There is no limit on the number of files or their size beyond your device's memory, and there is no daily quota because there is no server keeping count.
How it works
- Drop two or more PDF files, or tap to pick them.
- Arrange them with the arrows. The combined document follows the list top to bottom.
- Combine, and the single PDF downloads.
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
Are bookmarks, links and form fields kept?
Pages are copied with their content, fonts, images and internal links. Bookmarks (the outline) and form fields are not carried across in the current version.
Can I combine only some pages of each file?
Extract the pages you need first with the split tool, then combine the extracts.
Why is the combined file smaller or larger than the sum?
Slightly smaller is normal, because shared resources are written once. Larger is unusual and means a source file had unused objects the copy kept; the compress tool's lossless cleanup will fix it.
Is the file uploaded anywhere?
No. There is no server in this process. The page is a static file and the work is done by code running inside your browser tab. You can load the page, turn off Wi-Fi, and it still works.
More PDF tools
Merge PDF
Combine PDFs into a single document. Drag to reorder. No file limits, no watermark, nothing uploaded.
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.
Other 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.
- 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.