PDF tools that never upload your file anywhere
Unlock, compress, split, merge, rotate, reorder, convert to and from images, extract text, wipe metadata and protect PDFs for free. Everything happens inside your browser: there is no server to receive your document, and the counter above proves it.
All tools
Load the PDF once and choose what to do. You see a preview of the result before processing.
How can nothing be uploaded?
Traditional PDF tools work the other way around: they upload your file to a server, process it there and send the result back. Your document passes through someone else's computer, on a network you cannot see, and stays there as long as their policy says.
Koy PDF brings the PDF engine to your browser instead of taking your file to the engine. When you open the page, the program that reads and writes PDFs (mupdf, compiled to WebAssembly) is downloaded, and from then on all the work is done by your computer or phone. There is no address to upload files to: it is not a privacy promise, it is the architecture.
You can check it yourself. The counter in the header adds up every byte leaving this tab and stays at 0 B while you work. And if you want to see it with your own tools, open your browser's Network tab and use any feature: you will not see a single request carrying your file. You can even disconnect from the internet and keep working.
- Open the pageThe PDF engine is downloaded to your browser once.
- Load your fileIt is read into your device's memory. It is never attached to a request.
- Download the resultIt is generated locally and goes straight to your downloads folder.
Compared with the best-known PDF tools
Smallpdf, iLovePDF and most PDF sites process your file on their servers. They do their job well, but your document has to travel there. This is the difference:
| Koy PDF | Smallpdf, iLovePDF… | |
|---|---|---|
| Where the file is processed | On your device, inside the browser | On their servers |
| Does your file leave your device? | Never | Yes, it is uploaded for processing |
| What happens to the file afterwards? | No copy: it never existed outside your device | Deleted after a while, according to their policy |
| Works offline | Yes, after the first visit | No |
| Sign-up or account | No | For some features or to lift limits |
| Free plan limits | None | Tasks per day or file size |
| Preview before processing | Yes: estimated size, pages, parts | No |
| Passwords | Used only in your browser | Travel to the server with the file |
General facts about how server-side services work, taken from their own help and privacy pages. Each has plans and terms that change; check them if you need details.
Detailed comparisons:
Common use cases
Paperwork and situations people come here for.
- Compress a PDF to send it by emailGet your PDF under the email attachment limit (10, 20 or 25 MB) without uploading it anywhere. See the estimated size before compressing.
- Compress a PDF to under 2 MBGet your PDF under 2 MB for government, university or job application portals, without uploading it anywhere.
- Merge the documents of an application into one PDFBundle all the documents of an application into one PDF, in the order the form asks for, without uploading them anywhere.
- Remove the password from a bank statementBanks send statements protected with your ID number or date of birth. Remove the password without uploading the file anywhere.
Frequently asked questions
Do you really not upload my file?
No. There is no server that receives files: the page only delivers the program, and that program runs in your browser. You can open your browser's Network tab while using any feature and confirm that no request carries your PDF.
Is it free? Are there limits?
It is free, with no sign-up, no watermark and no daily file limit. The only limit is your device's memory: a PDF of hundreds of MB may be slow or run out of memory on a phone.
What happens to my file when I close the tab?
It disappears. It lived only in that tab's memory. There is no cache, history or copy anywhere.
Is it safe for sensitive documents?
That is exactly what it is designed for: bank statements, contracts, ID documents, medical reports. Since nothing leaves your device, nothing can leak in transit or on a server.
Does it work offline?
Yes. After the first visit, the browser keeps the page and the PDF engine, and you can use it disconnected. You can also install it as an app from the browser menu.
What about passwords?
They are used only in your browser to open the file. They are not sent, not stored and we never see them. Same when protecting a PDF: the key is applied locally.
What about analytics?
We use Vercel Web Analytics, which counts visits without cookies: it records the page visited and the device type, nothing about the file or what you do with it. It is the only request that leaves the page, and the counter shows it separately so there is no doubt.