Merge PDF — private, in-browser
Combine PDF files into one document without uploading them anywhere. Everything runs in your browser, so your files never leave your device.
Your files never leave this deviceor drag & drop them here — add as many as you like
Why merge PDFs in the browser?
Most free PDF mergers quietly upload your documents to a server so they can process them. That is fine for a grocery list, but not for lease agreements, bank statements, contracts, or anything with a social security number on it. This tool does the merge locally with pdf-lib, an open-source PDF engine written in JavaScript, so there is no upload step at all — it works even if you disconnect from the internet after the page loads.
Add your files, arrange them with the arrows, and hit merge. You get a single combined PDF downloaded straight to your device. There are no page caps, no watermarks, and no email required.
FAQ
Are my PDF files uploaded to a server?
No. Merging happens 100% in your browser using WebAssembly-free JavaScript (pdf-lib). Your files never leave your device, which makes this safe for contracts, statements, and any sensitive documents.
Is there a file size or page limit?
There is no artificial limit. Because processing is local, the ceiling is your device memory. Typical documents (tens of MB, hundreds of pages) merge in seconds.
Can I reorder the files before merging?
Yes. Add your PDFs, then use the up/down arrows on each file to set the order. The merge follows that order top to bottom.
Does it work on my phone?
Yes. It runs in any modern mobile or desktop browser with no install and no account.
Is it really free?
Yes — free with no sign-up, no watermark, and no page limits.