Small tools, instant answers

Count words, generate passwords, convert units and time zones, fix text case, or run a finance calculation, right in your browser. Free, instant, no sign-up.

Browse all tools Finance calculators

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Every tool runs instantly in your browser. Pick a category to get started.

Calculators

Business Tools

Invoice generator Professional invoices with items, tax, discounts and multi-currency. Print or save as PDF. Open tool → QR code generator Custom QR codes with your colors and error correction. Download as PNG. Open tool →

Why everything runs in your browser

Most tool sites send your input to a server. That is slow, and it means your text, passwords and numbers travel across the internet. Every tool here does its work locally with JavaScript: what you type never leaves the page.

The side effect is speed. Counts, conversions and generations update on every keystroke with no round trip.

Built to be useful

Transparent math: calculators show the exact formula they use, so you can check the work.
No accounts: no sign-up, no tracking of what you type.
Educational, not advice: calculators give planning estimates. Big decisions deserve a licensed professional.

FAQ

Frequently asked questions

Are these tools really free?

Yes. Every tool on Micro Tools Hub is free with no account, no sign-up and no usage limits.

Is my data sent to a server?

No. All tools run entirely in your browser with JavaScript. Nothing you type or generate is uploaded anywhere.

Do the tools work on mobile?

Yes. Every page is responsive and works on phones, tablets and desktops.

Do the tools work offline?

Once a page has loaded, the tools keep working without a connection because all logic runs locally.

Are the finance calculators financial advice?

No. The calculators provide estimates for planning and education based on the numbers you enter. For decisions with lasting consequences, consult a licensed professional.

Will more tools be added?

Yes. New tools and calculators are added regularly, grouped into categories so they stay easy to find.