Combine multiple PDF files into one single document in seconds. Drag and drop to reorder pages. Free online PDF merger with batch processing support.
Merge PDF in a few steps
- 1
Open Merge PDF and drag your file into the upload area, or click to browse from your device.
- 2
Adjust the available options to match what you need.
- 3
Run the tool — all processing happens locally, in your browser, in seconds.
- 4
Download the result. Your original file is never modified or uploaded.
What Merge PDF is good for
Combining scanned pages
Merge separately-scanned pages into a single document in the right order, with drag-and-drop reordering.
Assembling reports
Stitch a cover page, body, and appendices from different files into one deliverable PDF.
Bundling invoices or receipts
Collect a month of receipts into one file for expenses or bookkeeping.
Frequently asked questions
- Can I reorder the files before merging?
- Yes. Drag files (or individual pages in page mode) into any order before you merge.
- Is there a limit on how many PDFs I can merge?
- There is no fixed limit — you are bounded only by your device memory, since everything is processed locally.
- Is Merge PDF free to use?
- Yes. Merge PDF is completely free, with no sign-up, watermarks, daily quotas, or file-size caps. You can process as many files as your device can handle.
- Are my files uploaded to a server?
- No. Merge PDF runs entirely in your browser using WebAssembly. Your documents never leave your device — there are no uploads, no servers, and nothing is stored or logged. That is what makes PDF-Atlas private by architecture.
- Does Merge PDF work offline?
- Yes. After the page has loaded once, the tool keeps working without an internet connection. You can also install PDF-Atlas as a desktop app or PWA for a fully offline experience.
- Is my data safe?
- Because all processing happens locally on your machine, your files are as safe as the device they sit on. Nothing is transmitted to PDF-Atlas or any third party.