Free online tools and calculators
Over 70 calculators, converters, text utilities, and developer tools that run entirely in your browser. No sign-up, no downloads, and nothing you type is uploaded.
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Open Graph Tags: The Complete List and Image Size Guide
Open Graph tags are meta tags in a page's head that control how it looks when someone shares the link on Facebook, Linke...
Product Schema Markup: Required Properties and a JSON-LD Example
Product schema is structured data that tells search engines the name, price, availability and reviews of something you s...
How to Estimate Your Monthly LLM API Cost (With a Worked Example)
You can estimate what an LLM feature will cost per month with a short formula: the tokens you send and receive per reque...
Popular Tools
Explore All ToolsWord Counter
Count words, characters, sentences, and reading time as you type.
WritingPercentage Calculator
Percentages, percentage change, and what share one number is of another.
MathsLoan & EMI Calculator
Monthly repayments, total interest, and the real cost of a longer term.
FinanceBMI Calculator
Body mass index in metric or imperial, with the healthy range for your height.
HealthJSON Formatter
Format, validate, and minify JSON with clear syntax error messages.
DeveloperPassword Generator
Strong random passwords built with your browser’s cryptographic source.
SecurityUnit Converter
Length, weight, temperature, area, volume, speed, time, and data.
ConvertersWhat Is My IP?
Your public IP address, approximate location, and internet provider.
Network