Toolivaro

Free Online Calculators, Converters & Tools

Free, fast, private, browser-based business, math, health, home, developer, time, image tools. No account. No uploads. No clutter — just answers.

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Business Calculators 10 tools Profit margin, markup, break-even, and cash runway calculators that help you make fast, accurate business decisions. Math Calculators & Converters 2 tools Percentage calculations and unit conversions for everyday math — computed locally in your browser with explicit formulas and exact conversion factors. Health Calculators 1 tool Body-mass-index and health calculations with authoritative sources, clearly stated assumptions, and results that stay on your device. Home & Construction Estimators 5 tools Paint, flooring, tile, concrete, and gravel estimators with metric and imperial units, waste allowances, and package counts. Developer Tools 18 tools JSON formatting, validation, minification, and conversion tools that run entirely in your browser — your code never leaves your machine. Time & Date Tools 5 tools Date differences, business days, time-zone conversions, and meeting-overlap planning with correct daylight-saving handling. Image Tools 3 tools Resize, compress, and convert JPG, PNG, and WebP images privately — processing happens locally, and your files are never uploaded.

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Restaurant business calculators 7 tools Pricing, margins, and break-even math for restaurants and cafés — markups, profit margins, processing fees, and discounts in one place. Home renovation estimators 5 tools Material estimates for painting, tiling, flooring, concrete, and gravel — how much to buy before you start the job. Startup and freelance finance calculators 6 tools Runway, hourly rates, break-even, and compound growth — the cash math that founders and freelancers live with. Developer text and JSON toolkit 7 tools Format, minify, validate, convert, and diff JSON and text — plus regex testing and token counting for LLM work. Password, hashing, and security tools 6 tools Generate strong passwords, hash text with SHA-2, decode JWTs, and encode data — security utilities that run entirely in your browser. Time, date, and scheduling tools 7 tools Timezone conversions, cron expressions, date differences, and meeting planning — the calendar math that schedules everything else. Format and conversion tools 7 tools Convert between data sizes, number bases, color formats, and image types — quick conversions for developers and designers.
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Business Profit Margin Calculator See profit margin and markup percentages side by side from revenue and cost — with gross profit and rounding you control.
Business Discount Calculator Calculate the final price after any percentage discount, the exact amount saved, and the discount between two prices.
Developer JSON Formatter & Validator Format and validate JSON with readable indentation, precise error messages, and byte-size stats — fully local.
Developer Base64 Encoder & Decoder Encode text or files to Base64 and decode back, with UTF-8 handling, validation, and size stats — fully local.
Home Paint Calculator Estimate how many gallons or liters of paint you need for a room, from wall measurements, openings, and coats.
Time Date Difference Calculator Calculate the exact number of days, weeks, months, and years between two dates — with a single trusted method.
Image JPG, PNG & WebP Converter Convert images between JPG, PNG, and WebP with a quality control — locally, with live size and dimension stats.
Developer Text Diff Checker Compare two blocks of text line by line with added, removed, and unchanged highlighting plus change statistics — fully local.

Private by design

Runs on your device

Every calculator, converter, and image tool executes in your browser. Your numbers, pasted text, and image files are never sent to a server, logged, or stored — the only things kept locally are preferences like your theme and favorites.

No account, no tracking walls

There is nothing to sign up for. If you ever see advertising here, it will never appear inside a tool, between an input and its button, or near a download control — and it will only load with the consent rules your region requires.

Answers you can verify

Every tool shows its formula, its assumptions, a worked example, and its limitations. If you spot an error, the correction link on every page goes straight to a human review queue. See our methodology .