Merge PDF files — free and private
Merge PDF combines several PDF files into a single document, in exactly the order you want. Drop in as many files as you like, drag them into sequence, and download one tidy PDF — perfect for stitching together scanned contracts, invoices, chapters or reports.
Because the merge happens locally, even sensitive files stay on your machine. There's no queue, no upload bar, and no document that's simply 'too confidential' to combine.
How to merge PDFs in three steps
- Open the tool and add every PDF you want to combine — click Open or drag them onto the page.
- Drag the files (and individual pages) into the order you want, and remove anything you do not need.
- Click Merge, then download your single combined PDF.
Why Merge PDF runs on your device
Everything happens on your device. The moment you choose a file, Merge PDF loads it directly into your browser's memory and does all the work there with WebAssembly and JavaScript — the bytes never travel to a server, because there is no server in the loop. FreePDFX enforces a strict Content-Security-Policy whose connect-src 'self' rule makes it physically impossible for this page to send your document anywhere, even by mistake. Want proof? Open your browser's Network panel and watch, or simply switch off Wi-Fi first. As an installable Progressive Web App, it keeps working fully offline once the tools are cached. FreePDFX sets no advertising or analytics cookies today, and keeps only small settings you can see and wipe any time — your PDFs are never among them, because they are never received.
Lossless — nothing is re-encoded
This is a lossless operation. Your original pages are copied byte-for-byte into the result, so text stays selectable, images keep their exact quality and vector graphics stay razor-sharp — nothing is rasterised, re-compressed or downgraded. Every page from every source file is carried across untouched, so a merged file is indistinguishable from the originals stapled together.
Free forever, with no sign-up and no watermarks on your results. FreePDFX exists to give you the everyday PDF tools you need without handing your documents to a stranger's server. Every tool is honest about what it can and cannot do, so you always know whether you are getting a byte-perfect result or a solid best-effort one before you download.
Frequently asked questions
Are my files uploaded anywhere?
No. Merge PDF runs entirely inside your browser. Your file is opened in local memory and processed with WebAssembly and JavaScript, and the site's Content-Security-Policy blocks every network connection except to FreePDFX's own files — so your document simply has no route off your device.
Does this work offline?
Yes. FreePDFX is an installable Progressive Web App. After your first visit the tools are cached, so you can add it to your home screen or desktop and keep using Merge PDF with the Wi-Fi off — nothing needs to download again.
Is there a file size limit?
There's no server-side limit, because nothing is uploaded. The only ceiling is your own device's memory: very large or high-resolution PDFs use more RAM, so an older phone handles less than a modern laptop. If a huge file struggles, close other tabs and try again.
Do I need to sign up or pay?
No. FreePDFX is free and needs no account, email or payment. Open a file and go — there's nothing to register, and no watermark is added to your results.
Can I reorder the files before merging?
Yes. Drag the files into any order before you merge, and you can drop in individual pages too. The final PDF follows the exact sequence you set.
Will merging change the quality of my pages?
No. Merge is lossless — pages are copied as-is, so fonts, images and vectors look identical to the originals.