Every tool, one standard: each calculator, converter and game on this site is built the same way — engineered to be exact, tested before published, and private by architecture.
Almost every tool on MultiTool runs 100% in your browser. Your PDFs are processed by your own device; your texts, numbers and images never travel to a server — there is no upload endpoint to send them to. The two exceptions in the entire catalog (URL shortening, which calls a shortening service by design, and live exchange rates, which request public currency prices — never your amounts) are documented openly in our Privacy Policy. This is the architecture review boards call privacy by design: privacy that does not depend on trust.
Every tool ships with a battery of automated checks executed before deployment. Calculators are validated against known reference values (a currency converter against defined exact factors, a statistics engine against textbook datasets). Generators and games run logic tests in simulated conditions — the Sudoku engine, for example, verifies in every batch that each generated puzzle has exactly one solution. If a build fails any check, it does not deploy.
Our editorial rule: every calculation shows its formula, every comparison shows its numbers, and every health or finance tool shows its limitations. The guides that accompany the tools ( see all) exist to explain the why — which image format to pick, how much a PDF can really shrink, what a token is — with real numbers you can check, not vague claims.
Estimates are labeled as estimates (token counts, calorie needs, AI costs). Tools that can be wrong in dangerous ways — electrical load, health decisions — say so on the page and recommend a professional. We would rather lose a click than mislead a reader.
The site scores 100/100 (desktop) and 96/100 (mobile) on Google PageSpeed — optimized images, self-hosted fonts, no tracking bloat. Speed is part of quality: a tool that takes seconds to appear is a worse tool.
A tool is published only when it works on real files and its page carries its own explanation: what the result means, where the limits are, and when another approach is better. Publishing is not the same as asking search engines to index, though. After the whole catalogue was reviewed, the pages that were still too thin — a couple of paragraphs around a button — were deliberately kept out of search engines until they meet the same bar as the rest. A page here is indexable when it has substantial content of its own, and that is a judgement we make page by page, not in bulk.
Three things we do not do, on principle: we do not republish content from other sites, we do not generate pages automatically to cover keyword variations, and we do not hide text or swap content for crawlers. If a page exists here, someone read it, used the tool on real material and checked the result.
Every tool page shows the date it was last reviewed, taken from the actual change history of the page — not a decorative date. When a bug is reported through the contact page, the correction ships in the next release and the review date moves with it. Explanations that turn out to be wrong, incomplete or out of date are treated as bugs, because a wrong explanation is worse than no explanation.
MultiTool is free and supported by advertising. There are no accounts, no subscriptions, no premium tier and no data sales — the ads next to a tool are the entire business model. That is also why we care about the reading experience: a page cluttered with interstitials would defeat the reason you came here, which is to finish a small task quickly.
Bugs and suggestions make the site better — reach us through the contact page. Corrections ship fast.