Tools
A small collection of online tools — pure client-side, privacy-first.
US Mortgage Calculator
Pure client-side mortgage calculator: P&I, property tax, insurance, HOA, PMI, extra payments, 15/20/30 year comparison and amortization schedule. Data never leaves your browser.
Scientific Calculator
Free online scientific calculator: trigonometric functions, logarithms, exponentials, factorial, power operations, parentheses, history, and memory — pure client-side, nothing leaves your browser.
Compound Interest Calculator
Pure client-side compound interest calculator: initial principal + monthly contributions, monthly compounding, see how it grows long-term.
US Paycheck Calculator
Pure client-side US paycheck calculator using 2026 federal tax brackets and FICA — estimate your take-home pay.
Currency Converter
Free online currency converter covering 166 currencies, rates cached hourly.
JSON Formatter / Minifier
Parse, format, and minify JSON — pure client-side, never uploaded.
Unix Timestamp Converter
Convert between Unix timestamps and dates, seconds or milliseconds.
Base64 Encoder/Decoder
Free online Base64 encoder and decoder — pure client-side, supports full UTF-8 including emoji, nothing ever leaves your browser.
UUID/GUID Generator
Pure client-side UUID/GUID v4 generator with bulk generation and case/hyphen formatting.
URL Encoder/Decoder
Encode and decode URLs — pure client-side, supports component and full URL modes.
Hash Generator
Pure client-side hash generator supporting MD5, SHA-1, SHA-256, and SHA-512 — nothing leaves your browser.
Password Generator
Pure client-side password generator using your browser's cryptographically secure RNG, with customizable length/character sets and a strength meter. Data never leaves your browser.
Color Converter
Pure client-side color converter — HEX, RGB, HSL, with a color picker and live preview.
Word/Character Counter
Pure client-side word and character counter — live counts of characters, words, CJK characters, lines, and paragraphs.
Regex Tester
Test regular expressions live — matches, positions, and capture groups, pure client-side.
Cron Expression Parser
Parse cron expressions client-side: plain-English description plus the next 5 run times. Nothing leaves your browser.
Markdown to HTML Preview
Live Markdown to HTML preview — pure client-side, output is sanitized, nothing ever leaves your browser.
QR Code Generator
Pure client-side QR code generator with custom size and error correction level, download as PNG.
Image Compressor
Free online image compressor — pure client-side, your photo never leaves the browser.
Image Format Converter
Free online image format converter — PNG, JPEG, WebP, pure client-side, your image never leaves your browser.
Text Diff Checker
Compare two blocks of text line-by-line or word-by-word — pure client-side, never uploaded.
Car Loan Calculator
Free online US car loan calculator: vehicle price, down payment, trade-in, APR, sales tax, fees, term, extra payments, with full amortization schedule — pure client-side.
Calorie Calculator
Free online TDEE / daily calorie calculator: Mifflin–St Jeor BMR + activity multiplier + cut/maintain/bulk goal + protein/carbs/fat split — pure client-side.
GPA Calculator
Free online GPA calculator: letter and percentage scales, AP/Honors weighted bonus, customizable courses and credits — pure client-side.
Web to Markdown Converter
Browser extension that saves any web page as Markdown — tables, language-tagged code blocks, and lazy-loaded images are all handled and bundled into a single zip, with oversized images auto-compressed. Runs in your browser, so it captures what your AI agent's crawler can't reach.
US Mortgage Quick Calc
Browser extension popup for a quick US mortgage payment estimate — P&I, tax, insurance, HOA, PMI. The full amortization schedule and term comparison stay on the web tool.
Compound Interest Quick Calc
Browser extension popup for a quick compound-interest / investment-growth estimate — principal, monthly contribution, expected return, and years, with the final balance, total contributed, and total growth shown instantly.
US Paycheck Quick Calc
Browser extension popup for a quick US take-home pay estimate — annual salary, filing status, and pay frequency, with federal tax, Social Security, Medicare, state tax, and take-home per paycheck shown instantly.