WikiSolutions
Free, client-side utility tools. No sign-up, no data leaves your browser.
WikiSolutions is a collection of 16 single-purpose calculators and converters covering finance, health, developer utilities, text processing, and design. Every tool runs its math entirely in JavaScript inside your browser tab — there's no server round-trip, no account, and no file upload, so the numbers or text you type never leave your device. Each tool page includes a short explanation of the formula or method it uses and a worked example, so you can check the calculation yourself rather than trust a black box. Pick a category below, or jump straight to the tool you need.
World Clock
A fixed UTC clock plus up to 5 customizable locations, updating live.
Finance
Paycheck Calculator
Estimate your net take-home pay from gross salary, filing status, pay frequency, and location.
Compound Interest Calculator
Project investment growth over time with regular contributions and custom compounding frequency.
Mortgage Calculator
Estimate your monthly mortgage payment, total interest, and full amortization schedule.
Percentage Calculator
Solve percentage of a number, percentage change, and percent increase/decrease instantly.
Utility
Health
Developer
Epoch & Timezone Converter
Convert Unix timestamps to human-readable dates across timezones, with a live epoch counter.
Password Generator
Generate cryptographically secure, customizable random passwords in your browser.
JSON Formatter
Format, validate, and minify JSON with syntax error detection, entirely in your browser.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to plain text, with URL-safe support.