Free Online Tools
Fast, private, and no sign-up required. Calculators, converters, formatters, and more.
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Popular Tools
Jump right in — these are the most used tools.
Age Calculator
Calculate your exact age in years, months, and days instantly. Find out how old you are and when your next birthday is with our free online age calculator.
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Percentage Calculator
Calculate percentages quickly and easily. Find X% of Y, what percent X is of Y, or the percentage change between two numbers.
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Date Calculator
Calculate the number of days, weeks, and months between two dates or add and subtract days from any date. Free and instant.
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JSON Formatter
Format, prettify, or minify JSON data instantly. Paste your JSON and get clean, readable output with customizable indentation.
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Image to WebP Converter
Convert JPG, PNG, GIF, and other images to WebP format instantly. Adjust quality and reduce file size. Runs entirely in your browser.
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Frequently Asked Questions
Are these tools really free?
Yes. Every tool on ToolNimbus is 100% free with no sign-up, no paywalls, and no usage limits.
Is my data sent to a server?
No. The tools run entirely in your browser, so your input never leaves your device.
Do I need to create an account?
No account is required. Open any tool and start using it immediately.
Can I use these tools on mobile?
Yes. Every tool is responsive and works on phones, tablets, and desktops.