Is my file really never uploaded?

Yes, and you can prove it rather than trust it. Load the page, disconnect from the internet, then use the tool. It works, because everything it needs is already on your device.

Is there a size limit?

Not one we set. The limit is your device's memory, so a phone will manage a smaller document than a laptop. Nothing is rejected for being large until your own browser runs out of room.

Is it slower than a service that uploads?

Usually it is faster, because nothing travels twice across the network. Very large files are the exception: a server has more memory than a phone and will win on those.

Do you keep anything at all?

No file ever reaches us, so there is nothing to keep. We count that a document was made, not what was in it or who made it.

Does it work on a phone?

Yes. It is the same page and the same engine, and most people who use this site are on a phone. Very large documents are the only case where a computer does noticeably better.

Do I need to install anything or sign up?

No to both. There is no account, and nothing to install: it is a web page that happens to do the work itself.

PDF

Editing a PDF without uploading it anywhere

Checked 25 September 2026

Nearly every online PDF tool works the same way: you hand over the file, a server somewhere does the job, and the result comes back. That is fine for a receipt and a poor idea for a contract. This explains what actually happens to a document you upload, how the tools on this site avoid it, and how to check the difference yourself in about thirty seconds.

What an online PDF tool normally does

You choose a file, a progress bar fills, and a moment later a download appears. That progress bar is the file leaving your computer. The work happens on a server you cannot see, run by a company you have not met, and the finished document is sent back to you. Most such services delete the upload after an hour or a day, and most of them mean it. But the document was on someone else's machine, it passed across the network, and for a contract, a passport scan or a client file that is a decision somebody should make deliberately rather than by clicking a button.

Where the work happens here

Every tool on this site runs inside the browser tab you already have open. The PDF engine is compiled to WebAssembly and downloaded to your device the first time you use a tool, in the same way a picture on a page is downloaded. Your file is opened by code running on your own machine, changed there, and handed straight back to you as a download. There is no upload step because there is nowhere for it to go.

How to check instead of believing us

This is the part worth testing, because a claim you cannot verify is just marketing. Open the developer tools in your browser with F12, choose the Network tab, then pick a file and run a tool. You will see the page and the engine load, and then nothing while the work happens. A simpler version of the same test: load the page, turn your wifi off, and then do the job. It finishes. No upload service on earth can do that.

What you give up

It is a real trade and it is worth stating plainly. The work uses your own device's memory, so a very large scanned document on an old phone will be slower than it would be on a server, and may not finish at all. The first tool you open downloads the engine, which takes a few seconds on a slow connection. And reading text out of a photographed page, which needs character recognition, is not something we do at all. A server-based service will beat us on all three.

When this actually matters

For a supermarket receipt, it does not. For a signed contract, a medical letter, a passport photograph, a bank statement or anything covered by a client agreement, it does. Lawyers and accountants in particular are often not allowed to put a client's document on a third party's server at all, which quietly rules out most of the internet's PDF tools. The same is true of anyone handling other people's identity documents.

One thing to still be careful about

Not uploading is not the same as being safe. A redaction that draws a black rectangle over a name leaves the name underneath, in the file, selectable by anyone who opens it in the right program. Plenty of tools, offline ones included, do exactly that. Ours removes the content rather than covering it, which is why the result cannot be undone even by us. When you use any other tool for this, open the finished file and try to select the text you hid.

Work it out for yourself

Frequently asked questions

Is my file really never uploaded?: Yes, and you can prove it rather than trust it. Load the page, disconnect from the internet, then use the tool. It works, because everything it needs is already on your device.
Is there a size limit?: Not one we set. The limit is your device's memory, so a phone will manage a smaller document than a laptop. Nothing is rejected for being large until your own browser runs out of room.
Is it slower than a service that uploads?: Usually it is faster, because nothing travels twice across the network. Very large files are the exception: a server has more memory than a phone and will win on those.
Do you keep anything at all?: No file ever reaches us, so there is nothing to keep. We count that a document was made, not what was in it or who made it.
Does it work on a phone?: Yes. It is the same page and the same engine, and most people who use this site are on a phone. Very large documents are the only case where a computer does noticeably better.
Do I need to install anything or sign up?: No to both. There is no account, and nothing to install: it is a web page that happens to do the work itself.