LyinTools
Umbrella product family and traditional/core tool shell.
Simple tools, clear product posture, governed execution.
LyinTools is the WhiteLyin everyday productivity suite for web tools, PDF tools, domain tools, hosting tools, mail tools, repository tools, and traditional everyday utilities.
LyinTools parent posture is stage-active through child modules. LyinWebTools and LyinPDFTools are stage-active, Unit Converter, Temperature Converter, Length Converter, Mass/Weight Converter, Area Converter, Date Difference Calculator, Academic Pass Mark Calculator, Percentage Calculator, Text Case Converter, and Word/Character Counter are active traditional executable tools, and stage remains non-production/noindex.
Parent suite and child-module posture.
LyinPDFTools
PDF tools for everyday document work.
LyinWebTools
Stage-active traditional and web utility tooling family under LyinTools.
LyinRepoTools
Future document workspace, template, workflow, and governance tools.
LyinDomainTools
Future domain and DNS tool family.
LyinHostTools
Future hosting and runtime-management tools.
LyinMailTools
Future managed custom-domain mailbox product under LyinTools.
LyinWebTools-owned traditional/core families.
Calculators
Converters
Validators
Normalisers
Formatters
Encoders / Decoders
Generators
Estimators
Inspectors
Parsers / Extractors
Text Tools
Date & Time Tools
Developer Utilities
Business/Admin Tools
Finance/Tax Tools
South African Local Tools
Web Tools
Traditional tool routes remain /tools/{family}/{tool-slug}. CAT3C0 aligns ownership to LyinWebTools without changing execution scope.
Current active public tools.
Unit Converter
Convert between length, mass, temperature, area, volume, time, data-size, pressure, power, and energy units.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin with deterministic arithmetic only.
Length Converter
Convert between meters, kilometers, centimeters, millimeters, feet, inches, yards, and miles with deterministic arithmetic only.
Mass/Weight Converter
Convert between kilograms, grams, milligrams, pounds, ounces, and metric tons with deterministic arithmetic only.
Volume Converter
Convert between liters, milliliters, cubic meters, gallons, pints, and quarts with deterministic arithmetic only.
Area Converter
Convert between square meters, square kilometers, square feet, acres, hectares, and other deterministic area units.
Percentage Calculator
Solve common percentage-of, percentage change, and proportion calculations with deterministic arithmetic only.
Compound Interest Calculator
Calculate compound interest from principal, annual rate, time, and compounding frequency inputs for estimate-only planning.
Discount Calculator
Calculate discount amount and final price from original price and discount percentage inputs.
Average Calculator
Calculate arithmetic averages and related list statistics from numeric values.
Ratio Calculator
Simplify and compare numeric ratios with deterministic arithmetic only.
Rounding Calculator
Round values using standard, up, down, and truncate modes with bounded decimal places.
Number Difference Calculator
Compare two numbers with absolute, signed, and percentage difference outputs.
Date Difference Calculator
Calculate deterministic Gregorian date differences and day offsets.
Age Calculator
Calculate age in years, months, and days from a birth date and as-of date using deterministic date arithmetic only.
Weeks Between Dates Calculator
Calculate whole weeks, remaining days, and week decimals between two dates using deterministic arithmetic only.
Academic Pass Mark Calculator
Plan weighted assessment marks for a class or module and estimate the average needed on remaining assessments.
Days From Date Calculator
Add or subtract a signed number of days from a base date using deterministic Gregorian arithmetic only.
Final Mark Needed Calculator
Estimate the final-mark requirement to reach a target result from current weighted mark, completed weight, and target final mark inputs.
Time Duration Calculator
Calculate duration between two times with optional overnight handling and no timezone or calendar dependencies.
Weighted Grade Calculator
Calculate weighted grade totals from assessment components with marks and weights.
Loan Repayment Calculator
Estimate monthly repayment, total repayment, and total interest from entered principal, rate, and term values only.
Test Average Calculator
Calculate average test marks, count, min, max, and optional pass counts from supplied marks.
GPA Calculator
Calculate cumulative GPA from grade points and credit values using a declared scale.
Text Case Converter
Convert between common text case styles with deterministic normalization rules.
Slug Generator
Generate URL-safe slugs from text using deterministic normalization rules.
Word/Character Counter
Count words, characters, lines, and basic text statistics with deterministic local processing.
JSON Validator
Validate JSON documents locally with deterministic parsing and public-safe validation output.
Hash Generator
Generate MD5, SHA1, SHA256, and SHA512 hashes from local UTF-8 input.
UUID Generator
Generate RFC 4122 version 4 UUID values using local deterministic formatting and cryptographic randomness.
XML Sitemap Generator
Generate XML sitemap content from local page path input with deterministic formatting.
UTM Link Builder
Build campaign tracking links locally from deterministic query-parameter input.
URL Validator
Validate URL syntax and safe scheme posture with deterministic local checks.
Basic Invoice Generator
Generate invoice-ready text output from locally entered line items with deterministic arithmetic only.
Basic Quote Generator
Generate quote-ready text output from locally entered line items with deterministic arithmetic only.
QR Code Generator
Generate deterministic SVG token grids from local text input for lightweight QR-style sharing workflows.
CSV Structure Validator
Validate CSV row-width consistency from local pasted CSV input with deterministic parsing.
SA Phone Number Normaliser
Normalise South African phone number input into deterministic E.164-style output using local rules only.
Markup Calculator
Calculate markup amount and selling price from cost and markup percentage inputs.
Margin Calculator
Calculate profit amount and gross margin percentage from cost and selling price inputs.
Simple Interest Calculator
Calculate simple interest from principal, annual rate, and time inputs for estimate-only planning.
Savings Goal Calculator
Project a savings target using current savings, monthly contribution, and annual rate inputs for estimate-only planning.
Profit Calculator
Calculate profit amount and profit margin percentage from revenue and cost inputs.
Time Unit Converter
Convert between seconds, milliseconds, minutes, hours, days, and weeks with deterministic arithmetic only.
Text Minifier
Collapse repeated whitespace into compact text output using deterministic local processing.
Line Sorter
Sort text line-by-line with deterministic ordinal comparison and optional uniqueness.
Markdown Formatter
Normalize basic Markdown spacing and heading presentation using deterministic local rules.
JSON Formatter
Format valid JSON with deterministic pretty-print output using local parsing only.
Password Generator
Generate local random passwords from selected character sets with no storage or external service usage.
Bulk List Generator
Generate predictable numbered list output from local prefix, range, and suffix inputs.
Random Code Generator
Generate local random codes from approved character sets with bounded count and length controls.
Robots.txt Generator
Generate robots.txt content from local allow, disallow, and sitemap inputs with no external lookups.
Short Link Generator
Generate a local short-path suggestion and redirect rule snippet without creating persistent redirect records.
SA ID Parser
Parse basic coded fields from a South African ID number using local checksum and date rules only.
SA ID Validator
Validate South African ID number format with local date and checksum rules only.
Exam Countdown
Calculate days and weeks until an exam date using deterministic date arithmetic only.
Simple Break-even Calculator
Estimate break-even units and revenue from fixed cost, price, and variable cost inputs.
Hourly Rate Calculator
Estimate an hourly rate from target income, costs, and billable hours.
Deadline Calculator
Calculate a calendar deadline from a start date and whole-day count.
Color Format Converter
Convert six-digit HEX colors to RGB channel output using local parsing only.
CSV Column Reorder Tool
Reorder pasted comma-separated columns by one-based column positions.
Find & Replace Tool
Run literal find-and-replace against pasted text using local processing only.
Find tools across the LyinTools suite.
Family-based previews, not a flat wall.
CAT3B expands breadth across Business/Admin, Finance/Tax, South African Local, and discovery-only Web/PDF readiness definitions while keeping execution unchanged.
Calculators
Open family page
Currency Converter
Selected public calculator route remains deferred until exchange-rate source governance, freshness policy, and non-advice copy are approved.
Fuel Cost Calculator
Deferred until an approved official fuel-price source and freshness policy exist.
Electricity Cost Calculator
Deferred until tariff-source policy and locality posture are approved.
Inflation Calculator
Deferred until official inflation-source governance and freshness policy exist.
Converters
Open family page
Unit Converter
Convert between length, mass, temperature, area, volume, time, data-size, pressure, power, and energy units.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin with deterministic arithmetic only.
Length Converter
Convert between meters, kilometers, centimeters, millimeters, feet, inches, yards, and miles with deterministic arithmetic only.
Mass/Weight Converter
Convert between kilograms, grams, milligrams, pounds, ounces, and metric tons with deterministic arithmetic only.
Validators
Open family page
Password Strength Checker
Estimate password strength locally with documented heuristics.
Formatters
Open family page
JSON Formatter/Validator
Format and validate JSON documents.
XML Formatter/Validator
Format and validate XML documents.
YAML Formatter/Validator
Format and validate YAML documents.
Encoders / Decoders
Open family page
Base64 Encoder/Decoder
Encode and decode Base64 content.
URL Encoder/Decoder
Encode and decode URL-safe strings.
Generators
Open family page
QR Code Generator
Generate deterministic SVG token grids from local text input for lightweight QR-style sharing workflows.
Password Generator
Generate local random passwords from selected character sets with no storage or external service usage.
Bulk List Generator
Generate predictable numbered list output from local prefix, range, and suffix inputs.
Random Code Generator
Generate local random codes from approved character sets with bounded count and length controls.
Text Tools
Open family page
Text Case Converter
Convert between common text case styles with deterministic normalization rules.
Text Reversal
Reverse text character order.
Text Replacement
Replace text occurrences with alternatives.
Slug Generator
Generate URL-safe slugs from text using deterministic normalization rules.
Date & Time Tools
Open family page
Date Difference Calculator
Calculate deterministic Gregorian date differences and day offsets.
Timezone Converter
Convert time between timezones.
UNIX Timestamp Converter
Convert between UNIX timestamps and human-readable dates.
Countdown Timer
Create and display countdown timers.
Developer Utilities
Open family page
JSON Validator
Validate JSON documents locally with deterministic parsing and public-safe validation output.
JWT Decoder
Decode and inspect JWT tokens without validation.
Regex Tester
Test regular expression patterns against sample text.
Color Converter
Convert between HEX, RGB, HSL, and other color formats.
Business/Admin Tools
Open family page
Invoice Number Generator
Generate invoice numbering patterns for internal workflow planning.
Quote Number Generator
Generate quote numbering patterns for internal workflow planning.
Purchase Order Number Generator
Generate PO numbering patterns for internal workflow planning.
Meeting Agenda Builder
Create agenda outlines for meeting preparation workflows.
Finance/Tax Tools
Open family page
VAT Calculator
Deferred until rate-source policy exists.
PAYE Estimate Calculator
Deferred until statutory source policy and disclaimer posture are approved.
UIF Estimate Calculator
Deferred until statutory source policy and disclaimer posture are approved.
Mortgage Calculator
Calculate monthly mortgage payment and total interest.
South African Local Tools
Open family page
South African VAT Calculator
South African VAT posture remains deferred pending verified source policy.
SA Public Holiday Lookup
Public holiday lookup remains deferred pending verified source-policy posture.
SA ID Basic Date/Gender Extractor
Basic extraction posture is blocked pending legal, privacy, and source-policy decisions.
Postal Code Lookup
Postal code lookup remains deferred pending provider/source policy approval.
Web Tools
Open family page
HTTP Header Checker
Inspect HTTP response headers.
XML Sitemap Generator
Generate XML sitemap content from local page path input with deterministic formatting.
Robots.txt Tester
Check robots.txt rules against example paths.
Meta Tag Previewer
Preview SEO and social snippets from page metadata.
Customer lane
Sign in on WhiteLyin Core to use active tools.
Public discovery happens here. Customer sign-in, workspace posture, usage, support, and contact-led upgrades live on WhiteLyin Core. Traditional tools are anonymous-first by default, paid users should eventually see no ads, and ad integration itself remains deferred.
- Public pages do not expose operator sign-in.
- Customer sign-in routes to the Core customer lane only.
- Deterministic calculators, converters, validators, estimators, and finance/tax tools need verified formula or source metadata before they can become Active.
- Checkout, invoices, API keys, and provider-backed billing remain deferred.
Commercial posture
Visible posture, contact-led next steps.
WhiteLyin can show ad-supported anonymous posture, future paid no-ads posture, and contact-led upgrades without claiming active checkout, ad network integration, or production launch.
Indexing posture for public tools.
Stage pages remain noindex, production canonical URLs remain metadata-only, and deferred or internal tools stay excluded from future indexing until quality content and launch readiness are explicitly approved.