SpaceNode is a small software company that makes iPhone and iPad apps such as QR Code Scanner, PDF Reader Pro and LED Banner. Building apps, we kept hitting the same small jobs: counting the characters in a store description, turning a few photos into one PDF, checking a percentage or how many days are left until a deadline. Rather than install another app or wade through ad-heavy sites each time, we built these 163 tools for ourselves and made them free for everyone.
The calculators and the text, image and PDF tools work entirely in your browser: what you type and the files you pick are not uploaded to our servers. Every tool page explains how to use it, shows the formula or method, walks through real examples with inputs and results, and answers common questions, so you can check the numbers yourself. Values that change every year, like tax rates, show the year they apply to and are updated from official sources.
