Merge PDF files online
Combine two or more PDFs into one tidy document in seconds. Drag your files in, drag them into the order you want, and download a single merged PDF. Everything happens locally in your browser, so your documents never leave your device.
How to use Merge PDF
- 1
Add your PDFs
Drag your PDF files into the drop area, or click to browse and select them from your device.
- 2
Put them in order
Move files up or down so they appear in the sequence you want in the final document.
- 3
Merge
Click 'Merge PDFs' and the files are combined locally in your browser within seconds.
- 4
Download
Download the single merged PDF. No watermark, no sign-up, no upload.
Combine PDFs without uploading them anywhere
Most online PDF mergers upload your files to a server, process them there, and send the result back. That is slow, it puts your private documents on someone else's machine, and it often comes with file-size caps or watermarks. In1 takes a different approach: the merge runs entirely inside your browser using WebAssembly. Your contracts, invoices, scanned IDs and reports are never transmitted over the network, which makes this one of the most private ways to combine PDFs online. It is also fast, because there is no upload-and-wait round trip — small files are typically merged in well under a second.
Reorder pages and files before you merge
Merging is rarely just 'glue file A to file B'. You usually need the cover letter first, then the report, then the appendix. In1 lets you add as many PDFs as you like and rearrange them into exactly the sequence you want before producing the final document. Add a file you didn't mean to include? Remove it with a single click. The order you see on screen is the order in the downloaded file, so there are no surprises.
Free, unlimited and watermark-free
There is no account to create, no email to hand over and no premium upsell standing between you and your merged PDF. You can combine as many documents as you want, as often as you want, and the output is a clean PDF with no watermark stamped across the pages. Because the heavy lifting happens on your own computer, there are no per-file fees and no daily limits to worry about.
Works on any device with a modern browser
In1 is built mobile-first, so merging PDFs works just as well on a phone or tablet as it does on a laptop. There is nothing to install — no desktop app, no browser extension, no plugin. As long as you have a recent version of Chrome, Edge, Firefox or Safari, you can merge PDFs on the spot, whether you are putting together an application packet at home or assembling a report on the go.
Common ways people use Merge PDF
People combine PDFs for all sorts of reasons: stitching together scanned pages into a single file, bundling a resume with a cover letter and portfolio, joining monthly statements into one annual archive, combining signed contract pages, or assembling chapters of an ebook. Because the tool keeps the original quality of each page and simply concatenates them, the result looks exactly like the source documents — just in one convenient file.
Higher limits, batch processing and an API are on the way. Want early access?