ToolkitBook

Free online CSS formatter and minifier tool. Beautify CSS with proper indentation, remove comments, or minify stylesheets for production. Supports media queries, flexbox, grid, and CSS variables. All processing runs...

Free online JavaScript formatter and minifier tool. Beautify JS code, remove comments and console logs, or minify for production. Supports ES6+, async/await, and modules. All processing runs locally in your...

Free online JSON formatter, validator, and minifier tool. Beautify JSON with proper indentation, validate syntax with error detection, sort keys alphabetically, or minify for production. All processing runs locally in...

Free online interest calculator for simple and compound interest. Calculate earnings on savings and investments with annual, monthly, or daily compounding. Compare different rates and terms to plan your finances....

Free mortgage calculator with PITI breakdown, PMI, property taxes, and amortization schedule. Calculate your true monthly house payment including principal, interest, taxes, and insurance. Model extra payments to see interest...

Free online word counter and text analysis tool. Count words, characters, sentences, and paragraphs instantly. Get reading time, speaking time, and word frequency analysis. All processing runs locally in your...

Free Chinese character counter with HSK level analysis. Count hanzi, view character frequency, pinyin pronunciation, and vocabulary diversity. All processing runs locally in your browser.

Count how often specific words appear in your text. Search multiple words simultaneously, get counts, percentages, and highlighted results. All processing runs locally in your browser.

Calculate projector distance or screen size based on throw ratio. Supports 16:9 aspect ratio, multiple units, and preset ratios. All processing runs locally in your browser.

Calculate area of circles, triangles, rectangles, and other 2D shapes. Enter dimensions in any unit and get instant results with perimeter, diagonals, and formulas displayed. Browser-based calculations with no data...

Calculate volume of spheres, cylinders, cones, cubes, and pyramids. Enter dimensions in any unit and get instant results with surface area and formulas displayed. Browser-based calculations with no data uploads.

Generate custom addition worksheets with 1-5 digit numbers. Choose from 10 to 100 problems per sheet, print with answer keys, and use the no-carry option for beginners. Free browser-based tool...

Generate custom subtraction worksheets with 1-5 digit numbers. Choose from 10 to 100 problems per sheet, print with answer keys, and use the no-borrow option for beginners. Free browser-based tool.

Generate custom multiplication worksheets with independent digit settings for each factor. Choose 1-5 digits per number, 10-100 problems per sheet, and print with answer keys. Free browser-based tool.

Generate custom division worksheets with independent digit settings for divisors and quotients. All problems divide evenly with no remainders. Choose 1-5 digits per number, 10-100 problems, print with answer keys.

Validate sitemap.xml files for syntax errors, protocol compliance, and common mistakes. Get detailed error reports with line numbers. All validation runs locally in your browser with no data uploads.

Generate cryptographically secure random passwords with customizable length and character types. Create up to 20 passwords at once, all processed locally in your browser with no server transmission.

Convert between metric and imperial units for length, weight, volume, temperature, area, and speed. Real-time calculations with precise conversion factors. Free browser-based tool.

Calculate your BMI using metric or imperial units. Get instant results with weight category, healthy range, and personalized recommendations. Free browser-based tool.