Articles
Practical guides for SmartPlusLab online tools.
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How to Generate Random Colors in Hex, RGB, or HSL
Choose a supported output format, set a count from 1 to 50 if you need multiple values, and generate the result. Leave the format at its default for hexadecimal output, or select RGB or HSL for those text formats.
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How to Use the Quadratic Equation Solver
Enter the numeric coefficients for a, b, and c in ax² + bx + c = 0, then read the discriminant, roots, and vertex coordinates. A positive, zero, or negative discriminant determines whether the reported roots are two real values, equal real values, or non-real complex components.
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How to Generate a QR Code from Text or a URL
Enter nonempty text or a URL, choose optional size, correction, and color settings, then generate the image. A successful result is a base64-encoded PNG.
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How to Calculate Profit Margin
Learn how to calculate profit margin and markup from cost and revenue, or determine target selling prices with step-by-step formulas and examples.
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How to Check Whether a Number Is Prime
Enter a numeric value and submit it to learn whether its converted integer is prime. For values above 2, the result also shows the nearest prime on each side, with distances included for non-prime values.
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How to Use a Prime Factorization Calculator
Enter an integer of 2 or greater, submit it, and use the factor list and breakdown details to read the result. Typing the number explicitly avoids the unresolved behavior associated with an omitted input.
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How to Convert Pressure Values Between Common Units
Enter a numeric pressure value, choose its source unit and the destination unit, then review the converted value and formatted display. The converter supports units such as pascals, bar, psi, atmospheres, torr, mmHg, inches of mercury, and inches of water.
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How to Use a Power Converter
Choose the source unit, target unit, and numeric power value, then run the conversion. The returned quantity uses the target unit and is rounded to 10 decimal places before it is returned for reading or comparison. Keep that unit beside the number.
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How to Convert PNG to WebP
Provide PNG image data as base64 text, optionally set the quality value, and start the conversion. A successful operation returns the WebP image data as base64 text.
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How to Convert PNG to SVG
Supply PNG image data, run the conversion, and inspect the returned black-and-white SVG-formatted text. Correct its malformed opening tag before treating the result as a valid SVG document.
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How to Create an SVG Placeholder Image with Custom Dimensions
Enter optional dimensions, label text, and colors, then generate the SVG placeholder. Blank dimensions use 400 by 300, while each effective dimension remains within 1 through 2000.
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How to Test a TCP Connection to a Public Host
Use Ping Test to measure TCP connection time to a public host and port. Set the available inputs, start the test, and review successful timings together with the average and loss percentage.