About mb-to-kb.com
mb-to-kb.com is built and maintained by teasoup, an independent developer, so a photo, signature, or PDF can meet a form’s KB limit in the browser without being uploaded.
This site does one job: it helps you fit a photo, a signature, or a PDF under the KB limit printed on an online form. The limit is often a few dozen or a few hundred KB. A phone photo is usually several MB. The gap is the whole product.
The work runs in your browser. The page reads the file you choose, compresses it with your device’s processor, and gives you a download. There is no account, no payment, and no server copy of the file. Closing the tab drops the working copy. Re-encoding a photo also drops camera metadata, including GPS, because the new file is built from pixels.
What you can do here
- Compress a photo to 20 KB, 50 KB, 100 KB, 200 KB, or any number, including a minimum when a form rejects files that are too small.
- Compress a PDF while keeping text selectable, or redraw the pages to hit an exact KB size.
- Resize a signature, clean a gray paper background, and set pixels or centimetres.
- Convert KB, MB, and GB in both the 1000-byte and the 1024-byte systems.
Why the default count is 1000 bytes
People write “KB” for two different steps. Decimal KB is 1000 bytes. Binary KiB is 1024 bytes. A file under 50 × 1000 bytes is also under 50 × 1024 bytes, so the stricter ceiling is the default. Every result card prints the raw byte count and both readings. You can switch a single job to 1024 bytes per KB in that tool’s settings.
What this site does not do
It does not list exam boards, government portals, or their current upload rules. Those rules change, and copying them from another website would be guesswork. Read the form you are filling in. It does not store files, sell a subscription, or ask you to install an app. It does not promise that a form will accept the file. Format, pixel size, and file name are separate checks, and the tool pages explain them.
Questions and corrections go to hello@mb-to-kb.com. The contact page says what to include. The privacy policy and terms of use describe the limits of the service.