OnePDF
Frequently asked questions
Everything people ask us before their first file
Privacy & security
No. Every tool — merge, split, compress, rotate, extract images, and images-to-PDF — runs using JavaScript libraries loaded into this page. Your file is opened and processed in your browser's own memory, and the result is handed back to you as a direct download. We don't have a backend that receives your document's contents.
No. Since your file never reaches a server we operate, there's nothing for us to see, store, or recover. Closing the tab or refreshing the page clears everything from memory immediately.
The processing itself is private for the reasons above. That said, use good judgment about the device and network you're on, and always check the output file before sharing it onward, the same as you would with any tool.
We use minimal, functional cookies and, where enabled, standard advertising cookies to support the free tools (see our Privacy Policy for specifics). Your PDF and image files themselves are never part of any tracking or analytics data — they simply aren't sent anywhere.
Using the tools
There's no artificial cap we impose. In practice, the limit is your device's available memory and your browser — files of a few hundred pages or a few hundred megabytes typically work fine on a modern laptop or phone, but very large scanned books may run slowly.
Merge, Split, Compress, Rotate, Extract images, and PDF-to-Word all work on standard .pdf files. Images-to-PDF accepts JPG, PNG, and WebP images (other common formats are converted automatically where the browser supports them).
To reach the smallest possible file size, that mode redraws each page as a single compressed image rather than keeping the original text and vector data. It's ideal when file size matters more than being able to select or search text — for anything else, try the Light or Recommended setting instead.
That happens when a PDF doesn't contain separately embedded image objects PDF.js can detect — for example, if the whole page was flattened into a single background layer. In that case we fall back to rendering each page as a high-resolution image so you still get usable output.
Yes — drag the file chips in the list into the order you want before running Merge or Images → PDF. The number shown next to each file is the order it will appear in the final document.
No. Output files are exactly what the tool produced — no watermark, no branding, and no attribution page added.
Cost & account
No. Open any tool and start using it right away.
Yes. OnePDF is free to use, and the site is supported by advertising rather than subscriptions.
You need an internet connection to load the page and its libraries the first time. Once loaded, the actual file processing doesn't require sending your document anywhere — but reloading the page will need connectivity again unless your browser has it cached.
Still stuck? Send us a message and we'll get back to you.