Calculators
Math, finance, health, mortgage, income, percentage, BMI, age, tax, and planning calculators.
Big Das: free calculators, games, SEO tools, simulations, converters, and utilities
Big Das is a free browser toolkit with practical calculators, image and PDF tools, classic games, interactive simulations, SEO helpers, generators, converters, data visualizations, and project guides.
Tool Categories
Image and PDF Tools
Compress images, convert formats, merge or split PDFs, add page numbers, OCR documents, and export pages.
SEO Tools
Word counting, keyword density checks, SERP previews, robots.txt generation, meta tags, FAQ schema, and sitemap XML.
Games
Play browser games including Tic Tac Toe, Memory Game, Snake, Hangman, Minesweeper, Sudoku, Tetris, and more.
Simulations
Explore physics, signal processing, optimization, electronics, wave motion, particles, and interactive math concepts.
Data is Beautiful
Interactive data visualizations for climate, space, sports, health, economy, technology, and global trends.
AI Tools
Generate images, comics, Arduino code, Verilog modules, speech, text, OCR output, and chat responses.
Generators
Create passwords, QR codes, placeholder text, gradients, color palettes, thumbnails, and other reusable assets.
Converters
Convert text case, color formats, and common units of length, weight, and measurement.
Projects
Read practical guides for Arduino, Raspberry Pi, electronics, software projects, and embedded systems.
Utility
Use device sensors and everyday utilities such as compass, accelerometer, magnetometer, orientation, light, and vibration tools.
Popular Free Tools
About Big Das
Every tool is designed to run directly in the browser where possible, with clear outputs and no account required. Visit the HTML sitemap, learn more about Big Das, review the privacy policy, read the terms of service, or contact us.