A small, deliberately boring set of tools that do one job each and get out of the way.
Most everyday computing problems are tiny. You need to know what 18% of a bill is. You need a photo under 2 MB because a government portal refuses anything larger. You need to merge three PDFs before an email deadline. You need to know how many days until a due date.
None of these need software installed, an account created, or a subscription. Yet the search results for them are dominated by pages that demand an email address before showing a result, bury the tool below a thousand words of filler, or push you toward a desktop download. Grabnix was built out of irritation with that pattern. Every tool here is one page, it works immediately, and the answer appears above the explanation rather than below it.
The guiding constraint is that your data should not need to travel for the tool to work. Modern browsers can resize an image, parse a PDF, hash a string and run any arithmetic you like without contacting a server, so that is how the tools are written.
The practical result is that the tools keep working on a bad connection, they are fast because there is no round trip, and confidential files stay confidential by construction rather than by promise. The single exception — converting Office documents to PDF, which genuinely needs a rendering engine we cannot ship to a browser — is documented openly in our privacy policy, including exactly when the uploaded file is deleted.
A calculator that is confidently wrong is worse than no calculator. We take a few specific steps to avoid that:
Grabnix is free to use and is supported by advertising. We think that trade is only honest if the ads stay out of the way, so they are kept to a limited number of clearly labelled placements, they are never disguised as tool output or download buttons, and no tool result is hidden behind one. If you ever find an ad on this site that is confusing, misleading, or dressed up to look like part of a tool, please report it via the contact page — we would genuinely rather lose the placement than the trust.
Grabnix is an independent site, built and maintained by a small team of developers rather than a company with a marketing department. That is the honest reason the pages look plain: the effort goes into whether the tool gives the right answer, not into animation.
It also means we read our own mail. Bug reports, corrections to a formula, disagreements with a stated convention and requests for tools that do not exist yet all land in the same inbox, and a real person answers them. Several tools on the site exist because somebody wrote in asking for them.
Corrections and suggestions are welcome at contact@grabnix.com, or through the contact page. If you have found a genuine error in a calculation, please say which inputs you used and what you expected — that turns a report into a fix much faster.