OmniTools is a curated collection of free online utilities for everyday tasks - calorie tracking, code validation, JSON formatting, unit conversion, password generation, and more. Every tool runs entirely in your browser using standard web APIs, so your data never leaves your device. No signup, no limits, instant results.

How it works

Find a tool

Browse 100+ tools organized by category (Health, Developer, Text, Math & Life, Security) or use the search bar to jump straight to what you need.

Enter your data

Most tools update in real time - no submit button needed. Everything happens locally in your browser using standard web APIs, with no server round-trip.

Get your answer

Instant results with formulas, explanations, and copy-ready output. No friction, no waiting for a server response.

Why OmniTools?

Free forever, no paywalls

All 100+ tools, unlimited use, no "pro" tier, no hidden fees. OmniTools is supported by simple advertising that keeps the servers running.

Privacy by design

Your text, JSON, passwords, code, and health metrics never leave your device. All calculations run locally in your browser.

Instant results

Open a tool and start using it. Results appear in milliseconds, computed locally in your browser - no waiting for a server round-trip.

Works offline

Once a page is loaded, every tool continues working without internet - perfect for flights, subways, or areas with poor connectivity. Your tools stay with you wherever you go.

Frequently Asked Questions

What is OmniTools? v

OmniTools is a free collection of online utilities for everyday tasks - from calorie calculation and meal planning to JavaScript validation, JSON formatting, password generation, and unit conversion. All tools run entirely in your browser with no signup required.

Are these tools really free? v

Yes. Every tool on OmniTools is 100% free with no hidden costs, no premium tier, and no credit card required. The site is supported by non-intrusive advertising, which keeps it free for everyone.

Do I need to create an account? v

No. OmniTools has no accounts, no signup, no email collection, and no login. Open any tool and start using it immediately.

Is my data safe? v

Yes. All calculations and transformations run entirely in your browser using standard JavaScript. Your text, JSON, passwords, and code are never sent to a server. You can even disconnect from the internet after loading a page and every tool continues to work.

Can I use these tools offline? v

Yes for most tools. Once a page has loaded, all calculations happen locally in your browser. If you lose your internet connection, the tool will still work for the rest of the session.

Which browsers are supported? v

OmniTools works in all modern browsers: Chrome, Firefox, Safari, Edge, and Brave - on desktop and mobile. The tools use standard web APIs supported everywhere since 2020.

How accurate are the calculators? v

Our calorie calculator uses the Mifflin-St Jeor equation, a clinically validated formula. Unit and percentage calculators use exact conversion factors (for example, 1 inch = 2.54 cm exactly). Password and hash generators use your browser crypto APIs (crypto.getRandomValues and crypto.subtle.digest), the same primitives used by TLS and modern security software.

How can I support OmniTools? v

The best way to support us is to disable your ad blocker for this site or whitelist it. Ads are what keep the servers running and the tools free. You can also share OmniTools with anyone who might find it useful.

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