How your files stay private

Most "free" file tools upload your file to their server, process it there, and send it back. PixKB doesn't, because it can't: the site is a set of static web pages with no upload endpoint and no server-side code. Here is how it works and how to verify it yourself in about a minute.

How the tools work

• Images: your browser decodes the picture, draws it on an in-memory canvas, and re-encodes it at the size and quality you chose. Compressing to an exact KB target is a search: we try a quality, measure the result, and adjust until it fits.
• PDFs: open-source pdf.js and pdf-lib read and rebuild the PDF inside the page.
• iPhone HEIC photos: decoded by an open-source decoder that runs in the page.

All of this code is served from pixkb.com itself, so the tools need no third-party server.

Check it yourself (desktop Chrome, Edge or Firefox)

1. Open any tool, for example Compress image to 50KB.
2. Press F12 (or right-click → Inspect) and open the Network tab.
3. Click the clear button (🚫) so the list is empty.
4. Choose a photo and run the tool.
5. Look at the list. You will see no request containing your file. Items marked blob: or data: are your browser handling the file in memory. You may see small requests to Google Analytics; those carry a page name and an event name, never your file.

Or the offline test (works on phones too)

1. Open the tool once while online and tap Make available offline (or simply use it once).
2. Turn on airplane mode.
3. Reload the page and use the tool. It still works, because nothing needs a server.

What does leave your device

Ordinary page requests to load PixKB itself, plus Google Analytics events (page views and tool events with a coarse size range, never file data), and Google ads if they are shown. Details are in the Privacy Policy.

Limits we're honest about

• Your browser's memory sets the limit: very large files (for example a 100 MB PDF) may be slow or fail on older phones.
• Output is only as private as where you put it next. Once you upload the result to a portal or email it, that service's privacy rules apply.