Merge PDF files
Combine two or more PDFs into a single file. Pages stay in the order you drag them, page-for-page, no quality loss.
Drop your file here
or click to browse
Nothing has left this page since you opened the tool. Show network activity
The browser enforces this: the site’s security policy only lets the page talk to the code libraries’ servers and an anonymous usage counter (tool name, file type, size range). A request carrying your file to anywhere else would be blocked before it left.
Check it yourself: open your browser’s developer tools, go to the Network tab, and run the tool. Or turn off Wi-Fi once the tool has loaded; it keeps working.
How it works
Combine two or more PDFs into a single file. Pages stay in the order you drag them, page-for-page, no quality loss.
Drop the PDFs you want to combine, drag the file list to set the order, then merge. The combined PDF preserves the original page content from each source: text stays selectable, images stay at their original resolution, page sizes are kept as-is. There is no page limit and no file size limit other than what your device's memory can hold. Encrypted PDFs are loaded with ignoreEncryption, so most owner-restricted files merge fine. What this doesn't do: it doesn't deduplicate identical pages, doesn't rebuild bookmarks or form fields perfectly, and doesn't compress the output (use Compress PDF for that). All work happens locally via pdf-lib in your browser, so the files never get uploaded.
How to use it
- Drop your PDFs. Drag the PDF files you want to combine into the upload area, or click to pick them.
- Set the order. Drag the files in the list so they sit in the order you want them merged.
- Merge. Hit Merge and the tool combines the pages locally with pdf-lib, no upload.
- Download the combined PDF. The merged file downloads with every page at its original quality.
Frequently asked questions
- Do my PDFs get uploaded anywhere?
- No. The merge runs entirely in your browser using pdf-lib. The files never touch a server.
- Is there a file size or page limit?
- No hard limit. Practical limit is your device's available memory. We've merged 500+ page PDFs on a regular laptop.
- Can I reorder the PDFs before merging?
- Yes. After you drop the files, drag them in the list to set the merge order. The first file becomes pages 1-N of the output, then the next, and so on.
- Does merging reduce quality?
- No. Pages are copied as-is, no re-rendering, no re-compression. Output size is roughly the sum of the inputs.