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Free online tools
Small calculators and converters for everyday work. Open one, get your answer, close the tab — nothing to install, nothing to sign up for.
Free
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Runs in your browser
Finance & Business
2 toolsFees, pricing, margins, and money math for sellers, hosts, and freelancers.
What Is My IPSee your public IPv4 and IPv6 address the moment the page loads — plus location, network, browser and connection checks, a speed test and your request headers.
Etsy Fee CalculatorEnter your item price and shipping, and see exactly what you keep after transaction, listing, and payment-processing fees — before you list, not after you're surprised.
Profit Margin CalculatorCost in, price out: get your margin, markup, and profit per unit side by side, so a pricing change never quietly eats your profit.
Math
1 toolEveryday number work: percentages, ratios, averages, and more.
Health
Body and activity calculators: BMI, calories, pace, and more.
Tools in this category are on the way.
Converters
Units converted in your browser: length, weight, temperature, and more.
Tools in this category are on the way.
Date & Time
Ages, durations, and the days between dates.
Tools in this category are on the way.
Text & Dev
3 toolsWord counts, case conversion, and small developer utilities.
CSV to JSONPaste or drop a CSV file and get clean, formatted JSON back instantly. The conversion happens locally — your data never leaves your device.
Word CounterWords, characters, sentences, and reading time as you type. Handy for listings, essays, and posts with a hard limit.
Case ConverterUPPER CASE, lower case, Title Case and Sentence case in one click — paste, convert, copy. Nothing leaves your browser.
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Try a shorter word — “fee”, “margin”, “counter”.
More tools are in the works — new ones land here as they ship.