About FitKB

Why FitKB exists

Millions of people every year have to upload a photo or signature to an online form: exam registrations, job applications, passport and visa services, university admissions. Almost all of those forms set a strict file size limit, such as 20 KB or 50 KB, while phone cameras produce photos of several megabytes. FitKB was built to close that gap in a few seconds, on the phone people are already using, without sending private photos to a stranger's server.

FitKB is an independent project with no ties to any government or exam board.

How it works

When you choose a photo, your browser decodes it, applies the rotation stored by the camera, and draws it onto a canvas at the size you chose. It then encodes the canvas as a JPEG several times, searching for the highest quality that is still at or under your limit. Only when quality alone cannot reach the limit does it reduce the pixel dimensions, and then only as far as needed.

Limits are applied as KB × 1000 bytes so that results pass forms that count 1 KB as 1000 bytes and forms that count it as 1024. The method is explained in plain language in our guides, starting with how to compress a photo to an exact KB size.

Privacy by design

Photos never leave your device. There is no upload step, no account and no photo storage, and the result is created from pixels only, so location and camera data stored in the original file is not copied. Details are in the privacy policy.

How we test and review

• The size search and the crop calculations are covered by automated tests that run on every change.
• Every preset is checked in a real browser with full-size phone photos to confirm the result is under the limit.
• Pages are checked on small phone screens for readable text, large tap targets and no layout jumping.
• Each tool and guide shows the date it was last reviewed. Facts that depend on a country or form point to the official source.

What FitKB does not do

FitKB resizes, crops and compresses. It does not judge whether a photo meets passport or visa rules such as head size, background colour or expression, and it is not affiliated with any authority. Always follow the instructions of the organisation you are applying to. See the disclaimer.

Get in touch

Found a form that FitKB cannot satisfy, a mistake in a guide, or a preset you would like added? Visit the contact page. Suggestions from users decide which presets we add next.