Online format, compress and validate JSON data

Convert JSON to data models in TypeScript, Java, Go, Python and more programming languages

Professional text diff and merge tool with side-by-side/inline display, change application, syntax highlighting and more

Provides current time, Unix timestamp, millisecond time, time unit conversion and time formatting functions to help users quickly complete various time-related calculations and conversions

Online Base64 encoding/decoding tool, supports text, JSON, URL, file conversion

Common development website navigation

Online Markdown editor with real-time preview, syntax highlighting, file import/export

Convert Word documents (.docx, .doc) to Markdown format online, free and secure

Professional financial calculation tool supporting TVM, NPV, IRR and more

Full keypad: TVM, amortization, cash flows, NPV, IRR, worksheets, and scientific keys in your browser

Time Value of Money calculator supporting N, I/Y, PV, PMT and FV with end/begin payment options

Calculate Internal Rate of Return (IRR) for investments and projects with cash flow analysis

Calculate Net Present Value (NPV) for investments and projects to evaluate value creation

Calculate IRR for fixed periodic cash flows (annuities, rent, dividends) with optional future value

Calculate monthly mortgage payment, total interest, and amortization schedule for home loans

Price fixed-rate bonds from yield to maturity or solve annual YTM from market price. Supports annual, semi-annual, quarterly, and monthly coupons.

Simple and discounted payback period for a project from initial outlay and periodic cash flows.

Weighted average cost of capital from market values of equity and debt, cost of equity, pre-tax cost of debt, and marginal tax rate.

Calculate exact age in years, months, and days. See total days lived, next birthday countdown, and day of week at birth.

Calculate your Body Mass Index from weight and height. See your category and healthy weight range. Supports metric and imperial units.

Simple and elegant match puzzle game with multiple difficulty levels, challenge your observation and reaction speed

Classic 2048 number merging game with undo function, challenge your logical thinking and strategic planning skills

Classic Match-3 elimination game with chain elimination and combo bonuses, minimalist beautiful interface design, smooth animation effects

Simple and fun Sudoku game designed for beginners, with friendly difficulty, automatic candidate hints, and gentle error correction mechanisms

Classic Sudoku puzzle game with multiple sizes and difficulty levels, includes hints, validation, undo and other functions, challenge your logical thinking ability