ToolkitBook

Format and minify CSS code with proper indentation. Remove comments or minify stylesheets for production. Supports media queries, flexbox, grid, and CSS variables. Works in your browser.

Process multiple CSS files at once. Format, optimize, or minify CSS files in batch. Download all processed files with original names. Works in your browser.

Format and minify JavaScript code with proper indentation. Remove comments and console logs, or minify for production. Supports ES6+, async/await, and modules. Works in your browser.

Process multiple JavaScript files at once. Format, optimize, purify, or minify JS files in batch. Download all processed files with original names. Works in your browser.

Format and validate JSON with proper indentation. Check syntax for errors, sort keys alphabetically, or minify for production. Works in your browser.

Convert JSON to XML format instantly. Paste JSON or drag .json files, validate syntax, and download formatted XML. Works in your browser.

Convert XML to JSON format. Paste XML or drag .xml files, validate syntax, and download formatted JSON. Works in your browser.

Calculate simple and compound interest for savings and investments. Compare annual, monthly, or daily compounding. Plan your finances with different rates and terms. Works in your browser.

Calculate mortgage payments with PITI breakdown, PMI, property taxes, and amortization schedule. Model extra payments to see interest savings. Works in your browser.

Count words, characters, sentences, and paragraphs in your text. Get reading time, speaking time, and word frequency analysis. Works in your browser.

Count Chinese characters with HSK level analysis. View character frequency, pinyin pronunciation, and vocabulary diversity. Works in your browser.

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

Calculate projector throw distance or screen size from throw ratio. Find out how far to place your projector for a 100-inch screen, or what screen size fits your room. Works...

Free online stopwatch with lap and split times. Start, stop, pause, and record multiple laps. Timer runs in background. No sign-up needed.

Calculate area of circles, triangles, rectangles, and other 2D shapes. Enter dimensions in any unit and get instant results with perimeter and formulas. Works in your browser.

Calculate volume of spheres, cylinders, cones, cubes, and pyramids. Enter dimensions in any unit and get instant results with surface area and formulas. Works in your browser.

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. Works in your...

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. Works in your...

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. Works in your browser.

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. Works in your browser.

Generate cryptographically secure random passwords with customizable length and character types. Create up to 20 passwords at once. Works in your browser.

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

Calculate your BMI using metric or imperial units. Get instant results with weight category, healthy range, and recommendations. Works in your browser.

Add text watermarks to ID card images in your browser. Set font size, color, opacity, rotation, and spacing. Choose horizontal or diagonal layout. Download as PNG, JPEG, or WebP. Works...

Add text watermarks to passport scans and photos in your browser. Pick font size, color, opacity, and rotation. Choose grid or diagonal layout. Save as PNG, JPEG, or WebP. Works...

Generate JWT secret keys in hex, Base64, or Base64URL format. Supports 32-512 bit key lengths and customizable keys. Works in your browser.

Count how often each word appears in your text. Filter stop words, set minimum length, and export results as CSV. Works in your browser.

Count word occurrences in TXT or text-based PDF files. Drag and drop a file, filter stop words, and export results as CSV. Works in your browser.

Convert images to PNG, JPEG, WebP, or BMP in your browser. Pick multiple formats, adjust quality, and download. Works in your browser.

Paste a sitemap.xml and get line-by-line error and warning reports with the exact code flagged. Runs in your browser.

Upload a sitemap.xml file and get a line-by-line audit of errors and warnings. Works in your browser.

Convert numbers between binary, octal, decimal, and hexadecimal. Real-time results as you type. Works in your browser.

Convert RGB values to CMYK percentages and vice versa. Includes a color picker, along with HEX and HSL readouts. Works in your browser.

Convert between Gregorian (solar) and Chinese lunar calendar dates. Shows Gan-Zhi year, zodiac animal, and leap month details. Covers 1900–2100. Works in your browser.

Turn any photo into pixel art with adjustable pixel scale and output size. Works in your browser.

Calculate Beamer slide and text area dimensions for any aspect ratio. Outputs mm, pt, and in with copy-ready LaTeX code. Works in your browser.

Flip a coin to pick between two options. Assign choices to heads and tails, toss, and go with the result. Works in your browser.

Calculate cylinder volume from diameter or radius and height. Shows surface area, lateral area, base area, and step-by-step working. Works in your browser.

Free HTML formatter that beautifies code, removes comments, and strips empty lines. Check syntax before processing. Works entirely in your browser.

Format multiple HTML files at once. Check syntax, beautify code, remove comments and empty lines. Download all processed files as ZIP. Works in your browser.