Articles
Practical guides for SmartPlusLab online tools.
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How to Transform Text with the ROT13 Cipher
Enter usable, non-empty text in the ROT13 Cipher and start the transformation to receive its ROT13 form. Submit that returned value to the same operation again when you want to check reversibility for the tested example.
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How to Convert Roman Numerals and Arabic Numbers
Use the converter by entering an integer or Roman numeral, selecting the matching direction, and submitting the value. Successful results show both the numeric and Roman forms plus the selected direction.
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How to Generate a robots.txt File
Use the Robots.txt Generator to choose a user agent, an access setting, optional paths, and optional sitemap or crawl-delay entries. Generate the text, then review its directives against your intended rule before using it elsewhere.
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How to Convert RGB to HEX
Provide red, green, and blue channel values to receive lowercase HEX color text beginning with `#`, plus alternate HEX and RGB text forms. Omitted channels use documented defaults, while invalid channel values return an error indication instead of a converted color.
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How to Use a Resolution Converter for DPI, Aspect Ratio, and Pixel Dimensions
Select the mode that matches your known measurements, enter positive required values, and calculate. The tool can return aspect-ratio metrics, DPI and dot pitch, or a 16:9 resolution estimate from diagonal size and DPI.
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Test a Regex with Sample Text
Enter a nonempty regex pattern and sample text, choose a recognized matching mode when needed, and start the evaluation. A successful result shows the match total and can include positions, matched text, and capture groups.
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How to Use the Regex Library to Find a Predefined Pattern
Choose a supported category to retrieve its predefined regular expression and description, or leave the selector empty to browse all 16 patterns. The tool retrieves patterns; it does not accept separate text for testing.
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How to use a reading time calculator
Paste your text, choose a words-per-minute pace if needed, and review the reading, speaking, and scanning estimates. A blank or whitespace-only input returns zero-valued results.
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How to Use a Ratio Calculator
Use Simplify to reduce A:B, Missing to calculate A × C ÷ B, or Compare to evaluate A ÷ B against C ÷ D. Enter the required values, select the matching mode, and check the result for that arrangement.
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How to generate random strings with custom length and character types
Set the string length, quantity, character pool, and letter case, then run the generator. Length is constrained to 1-256 and count to 1-50, with defaults of 16 characters and one alphanumeric string when no options are supplied.
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How to Generate a Random Number
Enter ordered bounds, choose integer or decimal mode, set a permitted quantity, and submit. For decimal mode, provide a compatible precision value.
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How to Generate Random Email Addresses for Testing
Use Random Email to create email-address strings for testing, with optional quantity, domain, and name-based controls. The default output is one address, while a valid count can request between 1 and 50 results.