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PSD to PNG Converter
A PNG of the saved PSD composite. Decode the embedded RGB composite of a local PSD and export its pixels.
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Punycode Converter
Convert a hostname between Unicode characters and its xn-- Punycode representation.
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PX to REM Converter
Convert pixel values to CSS rem units with a configurable root font size and a quick reference table.
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Pyramid Frustum Volume Calculator
Find a right square pyramid frustum volume as h(a² + ab + b²)/3.
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Pyramid Surface Area Calculator
Find total area of a closed right square pyramid.
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Pyramid Volume Calculator
Pyramid volume = base area × perpendicular height / 3.
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Pythagorean Theorem Calculator
Find a right triangle hypotenuse from its two perpendicular legs.
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QR code scanner
Read a QR code from a local PNG, JPEG or WebP image. The decoded text appears on the page; links are not opened automatically.
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Quadratic Equation Solver
Find the discriminant and real or complex roots of a quadratic equation.
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Query String To JSON Converter
Convert URL query parameters into a JSON object of string arrays.
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Radioactivity Converter
Convert radioactivity between the listed units.
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Random Number Generator
Use rejection sampling on browser cryptographic random bytes to draw unbiased integers.
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Range Calculator
Find the range as largest observation minus smallest observation.
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Ratio Calculator
For a / b = c / x, the missing value is x = b × c / a.
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RC Time Constant Calculator
Find the time constant of an ideal first-order RC circuit as RC.
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Reading Time Calculator
Paste text and estimate reading time from its word count and your chosen reading speed.
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Rectangle Area Calculator
Area = width × height.
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Rectangle Diagonal Calculator
Find a rectangle diagonal using √(width² + height²).
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Rectangular Prism Volume Calculator
Rectangular prism volume = length × width × height.
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Regex Tester
Test JavaScript regular expressions in a separate worker and inspect matches, offsets, and capture groups.
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